Summary for 5 runs https://en.wikipedia.beta.wmflabs.org/wiki/Barack

Summary

Metric	Value
Page metrics
Performance Score	72
Total Page Transfer Size	1.5 MB
Requests	100
Timing metrics
TTFB [median]	759 ms
First Paint [median]	1.644 s
Fully Loaded [median]	3.929 s
Google Web Vitals
TTFB [median]	759 ms
First Contentful Paint (FCP) [median]	1.644 s
Largest Contentful Paint (LCP) [median]	1.748 s
Cumulative Layout Shift (CLS) [median]	0.10
Interaction To Next Paint (INP) [median]	120 ms
Total Blocking Time [median]	367 ms
Max Potential FID [median]	187 ms
CPU metrics
CPU long tasks [median]	6
CPU longest task duration	215 ms
CPU last long task happens at	3.161 s
Visual Metrics
First Visual Change [median]	1.633 s
Speed Index [median]	1.863 s
Visual Complete 85% [median]	1.733 s
Visual Complete 99% [median]	3.900 s
Last Visual Change [median]	3.900 s

Timings Summary

Metric	min	median	mean	max
Visual Metrics
FirstVisualChange	1.566 s	1.633 s	1.613 s	1.666 s
LastVisualChange	3.366 s	3.900 s	3.806 s	4.133 s
SpeedIndex	1.800 s	1.863 s	1.868 s	1.937 s
LargestImage	3.366 s	3.900 s	3.806 s	4.133 s
Heading	2.533 s	2.800 s	2.826 s	3.100 s
LargestContentfulPaint	3.366 s	3.900 s	3.806 s	4.133 s
LastMeaningfulPaint	3.366 s	3.900 s	3.806 s	4.133 s
VisualReadiness	1.700 s	2.267 s	2.194 s	2.534 s
VisualComplete85	1.700 s	1.733 s	1.733 s	1.766 s
VisualComplete95	3.366 s	3.900 s	3.806 s	4.133 s
VisualComplete99	3.366 s	3.900 s	3.806 s	4.133 s
Google Web Vitals
Time To First Byte (TTFB)	695 ms	759 ms	736 ms	765 ms
Largest Contentful Paint (LCP)	1.696 s	1.748 s	1.730 s	1.756 s
First Contentful Paint (FCP)	1.576 s	1.644 s	1.622 s	1.656 s
Cumulative Layout Shift (CLS)	0.1019	0.1019	0.1029	0.1052
More metrics
firstPaint	1.576 s	1.644 s	1.622 s	1.656 s
loadEventEnd	2.943 s	3.631 s	3.401 s	3.733 s
User Timing
mwStartup	1.573 s	1.612 s	1.610 s	1.631 s
CPU
Total Blocking Time	347 ms	367 ms	365 ms	380 ms
Max Potential FID	181 ms	187 ms	193 ms	215 ms
CPU long tasks	6	6	6	7
CPU last long task happens at	2.920 s	3.161 s	3.178 s	3.420 s

Download video Download timeline Download HAR Download Console Logs

| Waterfall | | Download HAR |

Waterfall

Run 4 SpeedIndex median

Download HAR Compare

| Video | Download |

Video

Download video

| Filmstrip |

Filmstrip

Use--filmstrip.showAll to show all filmstrips.

0 s

1.7 smwStartup 1.631 sFirst Contentful Paint 1.656 sFirst Visual Change 1.666 sLayout Shift 0.00330 1.669 s

1.8 sLCP <P> 1.752 sVisual Complete 85% 1.766 s

1.9 s

2 sCPU Long Task duration 131 ms

2.1 sCPU Long Task duration 197 ms

2.3 s

2.4 sDOM Content Loaded Time 2.305 s

2.5 sLayout Shift 0.01443 2.477 s

2.6 sCPU Long Task duration 57 msHeading 2.533 sLayout Shift 0.00000 2.570 sCPU Long Task duration 130 ms

2.8 s

2.9 sCPU Long Task duration 76 msLayout Shift 0.00709 2.896 s

3 sCPU Long Task duration 76 ms

3.1 sLayout Shift 0.00056 3.034 s

3.2 s

3.3 sLayout Shift 0.00056 3.228 s

3.4 sLayout Shift 0.07931 3.313 sLast Visual Change 3.366 sVisual Complete 95% 3.366 sVisual Complete 99% 3.366 sLargest Image 3.366 s

Coach

The coach helps you find performance problems on your web page using web performance best practice rules. And gives you advice on privacy and best practices. Tested using Coach-core version 8.1.1.

Coach score

Total score 77
Performance score 72
Privacy score 94
Best practice score 66

Performance advice (72)

Title

Advice

Score

Avoid slowing down the critical rendering path (avoidRenderBlocking)

The page has 2 blocking requests and 0 in body parser blocking (0 JavaScript and 2 CSS). There are 1 potentially render blocking requests. You need to verify if it is render blocking: https://en.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022

Description: The critical rendering path is what the browser needs to do to start rendering the page. Every file requested inside of the head element will postpone the rendering of the page, because the browser need to do the request. Avoid loading JavaScript synchronously inside of the head (you should not need JavaScript to render the page), request files from the same domain as the main document (to avoid DNS lookups) and inline CSS for really fast rendering and a short rendering path.

Offenders:

https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php

Don't scale images in the browser (avoidScalingImages)

The page has 3 images that are scaled more than 100 pixels. It would be better if those images are sent so the browser don't need to scale them.

Description: It's easy to scale images in the browser and make sure they look good in different devices, however that is bad for performance! Scaling images in the browser takes extra CPU time and will hurt performance on mobile. And the user will download extra kilobytes (sometimes megabytes) of data that could be avoided. Don't do that, make sure you create multiple version of the same image server-side and serve the appropriate one.

Offenders:

https://en.wikipedia.beta.wmflabs.org/static/images/project-logos/wikimedia-cloud-services.svg

https://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Barack_Obama_signature...signature.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/2/2b/58th_Presidential_Inau...-D-BP749-1327.jpg

Inline CSS for faster first render (inlineCss)

The page has both inline CSS and CSS requests even though it uses a HTTP/2-ish connection. If you have many users on slow connections, it can be better to only inline the CSS. Run your own tests and check the waterfall graph to see what happens.

Description: In the early days of the Internet, inlining CSS was one of the ugliest things you can do. That has changed if you want your page to start rendering fast for your user. Always inline the critical CSS when you use HTTP/1 and HTTP/2 (avoid doing CSS requests that block rendering) and lazy load and cache the rest of the CSS. It is a little more complicated when using HTTP/2. Does your server support HTTP push? Then maybe that can help. Do you have a lot of users on a slow connection and are serving large chunks of HTML? Then it could be better to use the inline technique, becasue some servers always prioritize HTML content over CSS so the user needs to download the HTML first, before the CSS is downloaded.

Avoid CPU Long Tasks (longTasks)

The page has 7 CPU long tasks with the total of 730 ms. The total blocking time is 380 ms . However the CPU Long Task is depending on the computer/phones actual CPU speed, so you should measure this on the same type of the device that your user is using. Use Geckoprofiler for Firefox or Chromes tracelog to debug your long tasks.

Description: Long CPU tasks locks the thread. To the user this is commonly visible as a "locked up" page where the browser is unable to respond to user input; this is a major source of bad user experience on the web today. However the CPU Long Task is depending on the computer/phones actual CPU speed, so you should measure this on the same type of the device that your user is using. To debug you should use the Chrome timeline log and drag/drop it into devtools or use Firefox Geckoprofiler.

Offenders:

unknown

self

unknown

self

unknown

Avoid doing redirects (assetsRedirects)

The page has 2 redirects. 1 of the redirects are from the base domain, please fix them! 1 request are from other domains, it could be 3rd-party assets doing unnecessary redirects. :(

Description: A redirect is one extra step for the user to download the asset. Avoid that if you want to be fast. Redirects are even more of a showstopper on mobile.

Offenders:

https://en.wikipedia.beta.wmflabs.org/wiki/Special:CentralAutoLogin/start?type=script&usesul3=0

https://login.wikimedia.beta.wmflabs.org/wiki/Special:CentralAutoLogin/checkLogg...gin/checkLoggedIn

Avoid extra requests by setting cache headers (cacheHeaders)

The page has 74 requests that are missing a cache time. Configure a cache time so the browser doesn't need to download them every time. It will save 805.9 kB the next access.

Description: The easiest way to make your page fast is to avoid doing requests to the server. Setting a cache header on your server response will tell the browser that it doesn't need to download the asset again during the configured cache time! Always try to set a cache time if the content doesn't change for every request.

Offenders:

https://upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Cscr-featured.svg/20px...-featured.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/f/fc/Padlock-silver.svg/20p...ck-silver.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/4/47/Sound-icon.svg/20px-Sound-icon.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama..._Barack_Obama.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Barack_Obama_signature...signature.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/f/f9/Obama_portrait_crop.jp...portrait_crop.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/2/2b/58th_Presidential_Inau...-D-BP749-1327.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/9/9f/Job_Growth_by_U.S._Pre...resident_-_v1.png

https://upload.wikimedia.org/wikipedia/commons/thumb/1/1f/Obama.svg/21px-Obama.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/5/5c/Great_Seal_of_the_Unit...bverse%29.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/a/a8/Office-book.svg/40px-Office-book.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/4/47/Sound-icon.svg/45px-Sound-icon.svg.png

https://upload.wikimedia.beta.wmflabs.org/wikipedia/commons/thumb/7/73/Blue_penc...ue_pencil.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/8/89/Symbol_book_class2.svg...ok_class2.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/4/48/Folder_Hexagonal_Icon....onal_Icon.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Portal-puzzle.svg/16px...al-puzzle.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/3/36/Seal_of_the_President_...ed_States.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Yellow_flag_waving.svg...ag_waving.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Seal_of_the_United_Sta...es_Senate.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/1/1f/Obama.svg/22px-Obama.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/40px-Commons-logo.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/2/24/Wikinews-logo.svg/30px...news-logo.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikiquote-logo.svg/25p...uote-logo.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/40...urce-logo.svg.png

https://upload.wikimedia.beta.wmflabs.org/wikipedia/commons/thumb/f/ff/Wikidata-...data-logo.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Barack_Obama_and_Bill_..._Bill_Clinton.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/2/26/Obama_family_portrait_...he_Green_Room.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/2/22/BlackhawksWhiteHouse20...hiteHouse2010.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/c/ca/Barack_Obama_playing_b...secretaries_2.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/3/36/Seal_of_the_President_...ed_States.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/0/01/A_coloured_voting_box....oting_box.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Loudspeaker.svg/20px-Loudspeaker.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/7/77/DIG13623-230.jpg/220px-DIG13623-230.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/3/3d/Obamas_at_church_on_In...tion_Day_2013.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Nuvola_apps_kaboodle.s..._kaboodle.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/b/b6/Obamamiltondavis1.jpg/...amiltondavis1.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/5/50/2004_Illinois_Senate_r...e_results.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/f/f1/BarackObamaportrait.jp...Obamaportrait.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/Lugar-Obama.jpg/220px-Lugar-Obama.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/7/70/Barack_Obama_Iraq_2006...ama_Iraq_2006.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/9/99/Flickr_Obama_Springfie...pringfield_01.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/a/a2/President_George_W._Bu...n_Oval_Office.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/2/24/ElectoralCollege2008.s...llege2008.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/3/33/P112912PS-0444_-_Presi...Office_-_crop.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/4/44/ElectoralCollege2012.s...llege2012.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/d/d7/US_President_Barack_Ob...e_-_2009Jan20.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/3/32/Barack_Obama_addresses...ss_2009-02-24.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/6/63/Obama_cabinet_meeting_...eting_2009-11.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/8/86/White_House_rainbow_fo...-sex_marriage.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/a/a5/20090124_WeeklyAddress...lyAddress.ogv.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/f/fc/U.S._Total_Deficits_vs...ses_2001-2010.png

https://upload.wikimedia.org/wikipedia/commons/thumb/2/25/US_Employment_Statisti...tatistics.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/6/63/Obama-venice-la.jpg/22...ama-venice-la.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/f/f5/Obama_signs_health_car...care-20100323.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/PPACA_Premium_Chart.jp...Premium_Chart.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/8/84/Percentage_of_Individu...%2C_1963-2015.png

https://upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Barack_Obama_visiting_...rora_shooting.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/4/42/Barack_Obama_at_Cairo_...rsity_cropped.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/8/83/Barack_Obama_foreign_t...ign_trips.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/7/76/Barack_Obama_and_Matte...ber_2016%2C_1.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/b/be/David_Cameron_and_Bara...it_in_Toronto.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Barack_Obama_welcomes_...e_Oval_Office.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/f/f7/Vladimir_Putin_and_Bar...5-09-29%29_04.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/20...urce-logo.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/a/ac/Obama_and_Biden_await_..._on_bin_Laden.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/1/17/Barack_Obama_talks_wit...8637772147%29.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Barack_Obama_meets_wit..._%28crop_2%29.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/e/e9/Official_portrait_of_B..._Barack_Obama.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Gallup_Poll-Approval_R...ack_Obama.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/3/3f/G8_leaders_watching_fo...hing_football.jpg

https://upload.wikimedia.org/wikipedia/commons/4/4d/Icon_pdf_file.png

https://en.wikipedia.beta.wmflabs.org/wiki/Special:CentralAutoLogin/start?type=script&usesul3=0

https://login.wikimedia.beta.wmflabs.org/wiki/Special:CentralAutoLogin/checkLogg...gin/checkLoggedIn

https://auth.wikimedia.beta.wmflabs.org/loginwiki/wiki/Special:CentralAutoLogin/...gin/checkLoggedIn

Long cache headers is good (cacheHeadersLong)

The page has 3 requests that have a shorter cache time than 30 days (but still a cache time).

Description: Setting a cache header is good. Setting a long cache header (at least 30 days) is even better beacause then it will stay long in the browser cache. But what do you do if that asset change? Rename it and the browser will pick up the new version.

Offenders:

https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php

Total image size shouldn't be too big (imageSize)

The page total image size is 751.2 kB. It's really big. Is the page using the right format for the images? Can they be lazy loaded? Are they compressed as good as they can be? Make them smaller by using https://imageoptim.com/.

Description: Avoid having too many large images on the page. The images will not affect the first paint of the page, but it will eat bandwidth for the user.

Total JavaScript size shouldn't be too big (javascriptSize)

The total JavaScript transfer size is 485.4 kB and the uncompressed size is 2 MB. This is totally crazy! There is really room for improvement here.

Description: A lot of JavaScript often means you are downloading more than you need. How complex is the page and what can the user do on the page? Do you use multiple JavaScript frameworks?

Offenders:

URL	Transfer size	Content size
https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php	20.0 KB	60.4 KB
https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php	17.1 KB	58.3 KB
https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php	287.6 KB	1.2 MB
https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php	24.7 KB	114.9 KB
https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php	2.7 KB	14.8 KB
https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php	120.7 KB	477.4 KB
https://auth.wikimedia.beta.wmflabs.org/loginwiki/wiki/Special:CentralAutoLogin/...gin/checkLoggedIn	1.1 KB	254 B

Make each CSS response small (optimalCssSize)

https://en.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.cite.styles%7Cext.dismissableSiteNotice.styles%7Cext.tmh.player.styles%7Cext.uls.interlanguage%7Cext.visualEditor.desktopArticleTarget.noscript%7Cext.wikimediamessages.styles%7Cmediawiki.interface.helpers.styles%7Cskins.vector.icons%2Cstyles%7Cskins.vector.search.codex.styles%7Cwikibase.client.data-bridge.externalModifiers%7Cwikibase.client.init&only=styles&skin=vector-2022 size is 24.3 kB (24327) and that is bigger than the limit of 14.5 kB. Try to make the CSS files fit into 14.5 KB.

Description: Make CSS responses small to fit into the magic number TCP window size of 14.5 KB. The browser can then download the CSS faster and that will make the page start rendering earlier.

Offenders:

URL	Transfer size	Content size
https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php	23.8 KB	180.6 KB

Don't use private headers on static content (privateAssets)

The page has 4 requests with private headers. The main page has a private header. It could be right in some cases where the user can be logged in and served specific content. But if your asset is static it should never be private. Make sure that the assets really should be private and only used by one user. Otherwise, make it cacheable for everyone.

Description: If you set private headers on content, that means that the content are specific for that user. Static content should be able to be cached and used by everyone. Avoid setting the cache header to private.

Offenders:

https://en.wikipedia.beta.wmflabs.org/wiki/Barack_Obama

https://en.wikipedia.beta.wmflabs.org/wiki/Special:CentralAutoLogin/start?type=script&usesul3=0

https://login.wikimedia.beta.wmflabs.org/wiki/Special:CentralAutoLogin/checkLogg...gin/checkLoggedIn

https://auth.wikimedia.beta.wmflabs.org/loginwiki/wiki/Special:CentralAutoLogin/...gin/checkLoggedIn

Best practice advice (66)

Title	Advice	Score
Cumulative Layout Shift (cumulativeLayoutShift)	You have a cumulative layout shift score (0.1037) that needs improvements. It is in the Google Web Vitals needs improvement range, shift higher than 0.1. You should manually check the filmstrip or video and check if it will affect the user.	50
Description: Cumulative Layout Shift measures the sum total of all individual layout shift scores for unexpected layout shift that occur. The metric is measuring visual stability by quantify how often users experience unexpected layout shifts. It is one of Google Web Vitals.
Meta description (metaDescription)	The page is missing a meta description.	0
Description: Use a page description to make the page more relevant to search engines.
Do not send too long headers (longHeaders)	https://en.wikipedia...wiki/Barack_Obama has a header content-security-policy that is 3350 characters long. https://en.wikipedia...bs.org/w/load.php has a header sourcemap that is 1473 characters long.	98
Description: Do not send response headers that are too long.
Offenders: https://en.wikipedia.beta.wmflabs.org/wiki/Barack_Obama https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php
Avoid too many third party requests (thirdParty)	The page do more requests to third party domains (69 requests and 802 kB) then first party (31 requests and 771.7 kB). The page transfer more bytes from third party domains (802 kB) then first party (771.7 kB). The regex .wmflabs. was used to calculate first/third party requests.	0
Description: Do not load most of your content from third party URLs.
Avoid unnecessary headers (unnecessaryHeaders)	There are 22 responses that sets both a max-age and expires header. There are 100 responses that sets a server header.	0
Description: Do not send headers that you don't need. We look for p3p, cache-control and max-age, pragma, server and x-frame-options headers. Have a look at Andrew Betts - Headers for Hackers talk as a guide https://www.youtube.com/watch?v=k92ZbrY815c or read https://www.fastly.com/blog/headers-we-dont-want.
Offenders: https://en.wikipedia.beta.wmflabs.org/wiki/Barack_Obama https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/static/images/project-logos/wikimedia-cloud-services.svg https://en.wikipedia.beta.wmflabs.org/static/images/project-logos/wikimedia-cloud-services.svg https://upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Cscr-featured.svg/20px...-featured.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/f/fc/Padlock-silver.svg/20p...ck-silver.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/4/47/Sound-icon.svg/20px-Sound-icon.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama..._Barack_Obama.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Barack_Obama_signature...signature.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/f/f9/Obama_portrait_crop.jp...portrait_crop.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/2/2b/58th_Presidential_Inau...-D-BP749-1327.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/9/9f/Job_Growth_by_U.S._Pre...resident_-_v1.png https://upload.wikimedia.org/wikipedia/commons/thumb/1/1f/Obama.svg/21px-Obama.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/5/5c/Great_Seal_of_the_Unit...bverse%29.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/a/a8/Office-book.svg/40px-Office-book.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/4/47/Sound-icon.svg/45px-Sound-icon.svg.png https://upload.wikimedia.beta.wmflabs.org/wikipedia/commons/thumb/7/73/Blue_penc...ue_pencil.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/8/89/Symbol_book_class2.svg...ok_class2.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/4/48/Folder_Hexagonal_Icon....onal_Icon.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Portal-puzzle.svg/16px...al-puzzle.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/3/36/Seal_of_the_President_...ed_States.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Yellow_flag_waving.svg...ag_waving.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Seal_of_the_United_Sta...es_Senate.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/1/1f/Obama.svg/22px-Obama.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/40px-Commons-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/2/24/Wikinews-logo.svg/30px...news-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikiquote-logo.svg/25p...uote-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/40...urce-logo.svg.png https://upload.wikimedia.beta.wmflabs.org/wikipedia/commons/thumb/f/ff/Wikidata-...data-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Barack_Obama_and_Bill_..._Bill_Clinton.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/2/26/Obama_family_portrait_...he_Green_Room.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/2/22/BlackhawksWhiteHouse20...hiteHouse2010.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/c/ca/Barack_Obama_playing_b...secretaries_2.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/3/36/Seal_of_the_President_...ed_States.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/0/01/A_coloured_voting_box....oting_box.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Loudspeaker.svg/20px-Loudspeaker.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/7/77/DIG13623-230.jpg/220px-DIG13623-230.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/3/3d/Obamas_at_church_on_In...tion_Day_2013.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Nuvola_apps_kaboodle.s..._kaboodle.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/b/b6/Obamamiltondavis1.jpg/...amiltondavis1.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/5/50/2004_Illinois_Senate_r...e_results.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/f/f1/BarackObamaportrait.jp...Obamaportrait.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/Lugar-Obama.jpg/220px-Lugar-Obama.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/7/70/Barack_Obama_Iraq_2006...ama_Iraq_2006.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/9/99/Flickr_Obama_Springfie...pringfield_01.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/a/a2/President_George_W._Bu...n_Oval_Office.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/2/24/ElectoralCollege2008.s...llege2008.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/3/33/P112912PS-0444_-_Presi...Office_-_crop.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/4/44/ElectoralCollege2012.s...llege2012.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/d/d7/US_President_Barack_Ob...e_-_2009Jan20.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/3/32/Barack_Obama_addresses...ss_2009-02-24.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/6/63/Obama_cabinet_meeting_...eting_2009-11.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/8/86/White_House_rainbow_fo...-sex_marriage.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/a/a5/20090124_WeeklyAddress...lyAddress.ogv.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/f/fc/U.S._Total_Deficits_vs...ses_2001-2010.png https://upload.wikimedia.org/wikipedia/commons/thumb/2/25/US_Employment_Statisti...tatistics.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/6/63/Obama-venice-la.jpg/22...ama-venice-la.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/f/f5/Obama_signs_health_car...care-20100323.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/PPACA_Premium_Chart.jp...Premium_Chart.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/8/84/Percentage_of_Individu...%2C_1963-2015.png https://upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Barack_Obama_visiting_...rora_shooting.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/4/42/Barack_Obama_at_Cairo_...rsity_cropped.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/8/83/Barack_Obama_foreign_t...ign_trips.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/7/76/Barack_Obama_and_Matte...ber_2016%2C_1.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/b/be/David_Cameron_and_Bara...it_in_Toronto.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Barack_Obama_welcomes_...e_Oval_Office.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/f/f7/Vladimir_Putin_and_Bar...5-09-29%29_04.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/20...urce-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/a/ac/Obama_and_Biden_await_..._on_bin_Laden.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/1/17/Barack_Obama_talks_wit...8637772147%29.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Barack_Obama_meets_wit..._%28crop_2%29.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/e/e9/Official_portrait_of_B..._Barack_Obama.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Gallup_Poll-Approval_R...ack_Obama.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/3/3f/G8_leaders_watching_fo...hing_football.jpg https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/skins/Vector/resources/skins.vector.styl...n-progressive.svg https://en.wikipedia.beta.wmflabs.org/w/skins/Vector/resources/skins.vector.styl...r-progressive.svg https://en.wikipedia.beta.wmflabs.org/w/resources/src/mediawiki.skinning/images/...nify-clip-ltr.svg https://upload.wikimedia.org/wikipedia/commons/4/4d/Icon_pdf_file.png https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/wiki/Special:CentralAutoLogin/start?type=script&usesul3=0 https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://login.wikimedia.beta.wmflabs.org/wiki/Special:CentralAutoLogin/checkLogg...gin/checkLoggedIn https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://en.wikipedia.beta.wmflabs.org/w/load.php...bs.org/w/load.php https://auth.wikimedia.beta.wmflabs.org/loginwiki/wiki/Special:CentralAutoLogin/...gin/checkLoggedIn https://en.wikipedia.beta.wmflabs.org/static/favicon/wikipedia-purple.png https://en.wikipedia.beta.wmflabs.org/static/favicon/wikipedia-purple.png

Privacy advice (94)

Title	Advice	Score
Set a referrer-policy header to make sure you do not leak user information. (referrerPolicyHeader)	Set a referrer-policy header to make sure you do not leak user information.	0
Description: Referrer Policy is a new header that allows a site to control how much information the browser includes with navigations away from a document and should be set by all sites. https://scotthelme.co.uk/a-new-security-header-referrer-policy/.
Offenders: https://en.wikipedia.beta.wmflabs.org/wiki/Barack_Obama

Page info

Page info
Title	Barack Obama - Wikipedia, the free encyclopedia
Generator	MediaWiki 1.44.0-alpha
Width	1904
Height	55332
DOM elements	16085
Avg DOM depth	16
Max DOM depth	29
Iframes	0
Script tags	6
Local storage	1.2 MB
Session storage	0 b
Network Information API	3g

Resource Hints
dns-prefetch
https://meta.wikimedia.beta.wmflabs.org/
https://en.wikipedia.beta.wmflabs.org/wiki/login.wikimedia.beta.wmflabs.org
preconnect
https://upload.wikimedia.beta.wmflabs.org/

Technologies used to build the page.

Data collected using Wappalyzer version 6.10.66. With updated code from Webappanalyzer 2024-12-27. Use --browsertime.firefox.includeResponseBodies htmlor --browsertime.chrome.includeResponseBodies htmlto help Wappalyzer find more information about technologies used.

Technology	Confidence	Category
MediaWiki	100	Wikis
PHP	100	Programming languages
Apache Traffic Server 9.2.10	100	Web servers
HSTS	100	Security

Data from run 4

Visual Metrics

Visual Metrics
First Visual Change	1.666 s
Speed Index	1.863 s
Largest Image	3.366 s
Heading	2.533 s
LargestContentfulPaint	3.366 s
Last Meaningful Paint	3.366 s
Largest Contentful Paint	3.366 s
Visual Complete 85%	1.766 s
Visual Complete 95%	3.366 s
Visual Complete 99%	3.366 s
Last Visual Change	3.366 s
Visual Readiness	1.700 s

Browser Metrics

Navigation Timing
backEndTime	765 ms
domContentLoadedTime	2.305 s
domInteractiveTime	2.305 s
domainLookupTime	179 ms
frontEndTime	2.083 s
pageDownloadTime	782 ms
pageLoadTime	3.630 s
redirectionTime	0 ms
serverConnectionTime	388 ms
serverResponseTime	977 ms

Google Web Vitals
Time to first byte (TTFB)	765 ms
First Contentful Paint (FCP)	1.656 s
Largest Contentful Paint (LCP)	1.752 s
Cumulative Layout Shift (CLS)	0.11
Total Blocking Time (TBT)	367 ms

First Contentful Paint info
Elements that needed recalculate style before FCP	614
Time spent in recalculate style before FCP	17.779 ms

Extra timings
TTFB	765 ms
First Paint	1.656 s
Load Event End	3.631 s
Fully loaded	3.826 s

User Timing marks
mwStartup	1.631 s

Largest Contentful Paint

When in time the page main content is rendered (collected using the Largest Contentful Paint API). Read more about Largest Contentful Paint.

Element type	P
Element/tag	<p></p>
Render time	1.752 s
Element render delay	987 ms
TTFB	765 ms
Resource delay	0 ms
Resource load duration	0 ms
Elements that needed recalculate style before LCP	1913
Time spent in recalculate style before LCP	37.807 ms
Load time	0 ms
*Size (widthheight)**	234624
DOM path
div:eq(1) > div > div:eq(2) > main#content > div#bodyContent > div#mw-content-text > div:eq(0) > p:eq(3)> div:eq(1) > div > div:eq(2) > main#content > div#bodyContent > div#mw-content-text > div:eq(0) > p:eq(3)>

The largest contentful paint is highlighted in the image. If no element is highlighted the element was removed before the screenshot or the LCP API couldn't find the element.

Detected Cumulative Layout Shift

0.10525 cumulative layout shift collected from the Cumulative Layout Shift API.

These HTML elements contribute most to the Cumulative Layout Shifts of the page. The higher score, the more layout shift.

Score	HTML Element
0.07931	<div data-v-app=""></div>,<table class="infobox vcard" style="width:22em"></table>
body > div:eq(1) > div > div:eq(2) > main#content > div#bodyContent > div#mw-content-text > div:eq(0) > div:eq(1),body > div:eq(1) > div > div:eq(2) > main#content > div#bodyContent > div#mw-content-text > div:eq(0) > table:eq(0)
0.01443	<div class="vector-column-start"></div>,<div class="mw-content-container"></div>
body > div:eq(1) > div > div:eq(1),body > div:eq(1) > div > div:eq(2)
0.00709	<table class="infobox vcard" style="width:22em"></table>
body > div:eq(1) > div > div:eq(2) > main#content > div#bodyContent > div#mw-content-text > div:eq(0) > table:eq(0)
0.00330	<header class="vector-header mw-header"></header>,<div class="mw-page-container"></div>
body > div:eq(0) > header,body > div:eq(1)
0.00056	<label class="cdx-label cdx-radio__label" for="skin-client-pref-vector-feature-custom-font-size-value-1"></label>,<label class="cdx-label cdx-radio__label" for="skin-client-pref-vector-feature-custom-font-size-value-2"></label>,<div class="mw-portlet mw-portlet-skin-client-prefs-skin-theme vector-menu" id="skin-client-prefs-skin-theme"></div>,<div class="mw-portlet mw-portlet-skin-client-prefs-vector-feature-limited-width vector-menu" id="skin-client-prefs-vector-feature-limited-width"></div>,<::before></::before>
body > div:eq(1) > div > div:eq(2) > main#content > div:eq(1) > div > nav:eq(1) > div#vector-appearance-pinned-container > div#vector-appearance > div#skin-client-prefs-vector-feature-custom-font-size > div:eq(1) > ul > li > div > form > div:eq(1) > label,body > div:eq(1) > div > div:eq(2) > main#content > div:eq(1) > div > nav:eq(1) > div#vector-appearance-pinned-container > div#vector-appearance > div#skin-client-prefs-vector-feature-custom-font-size > div:eq(1) > ul > li > div > form > div:eq(2) > label,body > div:eq(1) > div > div:eq(2) > main#content > div:eq(1) > div > nav:eq(1) > div#vector-appearance-pinned-container > div#vector-appearance > div#skin-client-prefs-skin-theme,body > div:eq(1) > div > div:eq(2) > main#content > div:eq(1) > div > nav:eq(1) > div#vector-appearance-pinned-container > div#vector-appearance > div#skin-client-prefs-vector-feature-limited-width,body > div:eq(1) > div > div:eq(2) > main#content > div:eq(1) > div > nav:eq(1) > div#vector-appearance-pinned-container > div#vector-appearance > div#skin-client-prefs-skin-theme > div:eq(1) > ul > li > div > form > div:eq(2) > span > ::before
0.00056	<label class="cdx-label cdx-radio__label" for="skin-client-pref-vector-feature-custom-font-size-value-1"></label>,<label class="cdx-label cdx-radio__label" for="skin-client-pref-vector-feature-custom-font-size-value-2"></label>,<div class="mw-portlet mw-portlet-skin-client-prefs-skin-theme vector-menu" id="skin-client-prefs-skin-theme"></div>,<div class="mw-portlet mw-portlet-skin-client-prefs-vector-feature-limited-width vector-menu" id="skin-client-prefs-vector-feature-limited-width"></div>,<::before></::before>
body > div:eq(1) > div > div:eq(2) > main#content > div:eq(1) > div > nav:eq(1) > div#vector-appearance-pinned-container > div#vector-appearance > div#skin-client-prefs-vector-feature-custom-font-size > div:eq(1) > ul > li > div > form > div:eq(1) > label,body > div:eq(1) > div > div:eq(2) > main#content > div:eq(1) > div > nav:eq(1) > div#vector-appearance-pinned-container > div#vector-appearance > div#skin-client-prefs-vector-feature-custom-font-size > div:eq(1) > ul > li > div > form > div:eq(2) > label,body > div:eq(1) > div > div:eq(2) > main#content > div:eq(1) > div > nav:eq(1) > div#vector-appearance-pinned-container > div#vector-appearance > div#skin-client-prefs-skin-theme,body > div:eq(1) > div > div:eq(2) > main#content > div:eq(1) > div > nav:eq(1) > div#vector-appearance-pinned-container > div#vector-appearance > div#skin-client-prefs-vector-feature-limited-width,body > div:eq(1) > div > div:eq(2) > main#content > div:eq(1) > div > nav:eq(1) > div#vector-appearance-pinned-container > div#vector-appearance > div#skin-client-prefs-skin-theme > div:eq(1) > ul > li > div > form > div:eq(2) > span > ::before
0.00000	<span class="vector-icon mw-ui-icon-wikimedia-expand"></span>,<span class="vector-icon mw-ui-icon-wikimedia-expand"></span>,<span class="vector-icon mw-ui-icon-wikimedia-expand"></span>,<span class="vector-icon mw-ui-icon-wikimedia-expand"></span>,<span class="vector-icon mw-ui-icon-wikimedia-expand"></span>
body > div:eq(1) > div > div:eq(1) > div:eq(1) > nav#mw-panel-toc > div#vector-toc-pinned-container > div#vector-toc > ul#mw-panel-toc-list > li#toc-Early_life_and_career > button > span:eq(0),body > div:eq(1) > div > div:eq(1) > div:eq(1) > nav#mw-panel-toc > div#vector-toc-pinned-container > div#vector-toc > ul#mw-panel-toc-list > li#toc-Presidential_campaigns > button > span:eq(0),body > div:eq(1) > div > div:eq(1) > div:eq(1) > nav#mw-panel-toc > div#vector-toc-pinned-container > div#vector-toc > ul#mw-panel-toc-list > li#toc-Presidency_(2009Ã¢â‚¬â€œ2017) > button > span:eq(0),body > div:eq(1) > div > div:eq(1) > div:eq(1) > nav#mw-panel-toc > div#vector-toc-pinned-container > div#vector-toc > ul#mw-panel-toc-list > li#toc-Post-presidency_(2017Ã¢â‚¬â€œpresent) > button > span:eq(0),body > div:eq(1) > div > div:eq(1) > div:eq(1) > nav#mw-panel-toc > div#vector-toc-pinned-container > div#vector-toc > ul#mw-panel-toc-list > li#toc-See_also > button > span:eq(0)

The elements that have shifted place is highlighted in the image (that have a higher value than 0.01). If the element shifted outside of the viewport, you will not see it there. It can be hard to understand what content that has shifted, if that's the case, checkout the video or the filmstrip of the run.

Long Animation Frames

Read more about the Long Animation Frames API here here.

The top 10 longest animation frames entries

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
263.8 ms	135.4 ms	182.8 ms	182.7 ms	0.1 ms
No availible script information.

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
122 ms	150.5 ms	41.9 ms	41.7 ms	0.2 ms
https://en.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.centralNotice.choiceData%2CgeoIP%2CstartUp%7Cext.centralauth.ForeignApi%2Ccentralautologin%7Cext.cite.ux-enhancements%7Cext.cx.eventlogging.campaigns%7Cext.cx.model%7Cext.cx.uls.quick.actions%7Cext.dismissableSiteNotice%2CeventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.echo.centralauth%7Cext.growthExperiments.SuggestedEditSession%7Cext.quicksurveys.init%2Clib%7Cext.scribunto.errors%7Cext.tmh.OgvJsSupport%2Cplayer%7Cext.uls.common%2Cinterface%2Cpreferences%2Cwebfonts%7Cext.urlShortener.toolbar%7Cjquery%2Coojs%2Coojs-ui-core%2Coojs-ui-widgets%2Coojs-ui-windows%2Csite%7Cjquery.client%2Cspinner%2CtextSelection%7Cjquery.spinner.styles%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctoc%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.interface.helpers%7Cmediawiki.interface.helpers.linker.styles%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.media%2Cready%7Cmediawiki.page.watch.ajax%7Cmmv.bootstrap%2Ccodex%7Cmw.config.values.wbDataBridgeConfig%7Cmw.cx.SiteMapper%7Coojs-ui-core.icons%2Cstyles%7Coojs-ui-widgets.icons%7Coojs-ui-windows.icons%7Coojs-ui.styles.icons-interactions%2Cindicators%7Cskins.vector.clientPreferences%2Cjs%7Cskins.vector.icons.js%7Cwikibase.client.data-bridge.init%7Cwikibase.client.vector-2022&skin=vector-2022&version=fq828
Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 257485

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
37.6 ms	65.4 ms	71 ms	64.2 ms	6.8 ms
https://en.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.centralNotice.choiceData%2CgeoIP%2CstartUp%7Cext.centralauth.ForeignApi%2Ccentralautologin%7Cext.cite.ux-enhancements%7Cext.cx.eventlogging.campaigns%7Cext.cx.model%7Cext.cx.uls.quick.actions%7Cext.dismissableSiteNotice%2CeventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.echo.centralauth%7Cext.growthExperiments.SuggestedEditSession%7Cext.quicksurveys.init%2Clib%7Cext.scribunto.errors%7Cext.tmh.OgvJsSupport%2Cplayer%7Cext.uls.common%2Cinterface%2Cpreferences%2Cwebfonts%7Cext.urlShortener.toolbar%7Cjquery%2Coojs%2Coojs-ui-core%2Coojs-ui-widgets%2Coojs-ui-windows%2Csite%7Cjquery.client%2Cspinner%2CtextSelection%7Cjquery.spinner.styles%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctoc%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.interface.helpers%7Cmediawiki.interface.helpers.linker.styles%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.media%2Cready%7Cmediawiki.page.watch.ajax%7Cmmv.bootstrap%2Ccodex%7Cmw.config.values.wbDataBridgeConfig%7Cmw.cx.SiteMapper%7Coojs-ui-core.icons%2Cstyles%7Coojs-ui-widgets.icons%7Coojs-ui-windows.icons%7Coojs-ui.styles.icons-interactions%2Cindicators%7Cskins.vector.clientPreferences%2Cjs%7Cskins.vector.icons.js%7Cwikibase.client.data-bridge.init%7Cwikibase.client.vector-2022&skin=vector-2022&version=fq828
Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 257485
https://en.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022
Invoker: IdleRequestCallback Invoker Type: user-callback Source Function Name: doPropagation Window attribution: self Source char position: 4307

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
31.7 ms	42.4 ms	45 ms	36 ms	9 ms
https://en.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022
Invoker: IdleRequestCallback Invoker Type: user-callback Source Function Name: doPropagation Window attribution: self Source char position: 4307
https://en.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022
Invoker: FrameRequestCallback Invoker Type: user-callback Source Function Name: flushCssBuffer Window attribution: self Source char position: 3233

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
28.1 ms	7.6 ms	74.8 ms	74.8 ms	0 ms
No availible script information.

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
20 ms	43.5 ms	27.5 ms	0 ms	27.5 ms
https://en.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.centralNotice.choiceData%2CgeoIP%2CstartUp%7Cext.centralauth.ForeignApi%2Ccentralautologin%7Cext.cite.ux-enhancements%7Cext.cx.eventlogging.campaigns%7Cext.cx.model%7Cext.cx.uls.quick.actions%7Cext.dismissableSiteNotice%2CeventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.echo.centralauth%7Cext.growthExperiments.SuggestedEditSession%7Cext.quicksurveys.init%2Clib%7Cext.scribunto.errors%7Cext.tmh.OgvJsSupport%2Cplayer%7Cext.uls.common%2Cinterface%2Cpreferences%2Cwebfonts%7Cext.urlShortener.toolbar%7Cjquery%2Coojs%2Coojs-ui-core%2Coojs-ui-widgets%2Coojs-ui-windows%2Csite%7Cjquery.client%2Cspinner%2CtextSelection%7Cjquery.spinner.styles%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctoc%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.interface.helpers%7Cmediawiki.interface.helpers.linker.styles%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.media%2Cready%7Cmediawiki.page.watch.ajax%7Cmmv.bootstrap%2Ccodex%7Cmw.config.values.wbDataBridgeConfig%7Cmw.cx.SiteMapper%7Coojs-ui-core.icons%2Cstyles%7Coojs-ui-widgets.icons%7Coojs-ui-windows.icons%7Coojs-ui.styles.icons-interactions%2Cindicators%7Cskins.vector.clientPreferences%2Cjs%7Cskins.vector.icons.js%7Cwikibase.client.data-bridge.init%7Cwikibase.client.vector-2022&skin=vector-2022&version=fq828
Forced Style And Layout Duration: 1 ms Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 257485

Blocking duration

Work duration

Render duration

PreLayout Duration

Style And Layout Duration

20 ms

43.5 ms

27.5 ms

0 ms

27.5 ms

https://en.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.centralNotice.choiceData%2CgeoIP%2CstartUp%7Cext.centralauth.ForeignApi%2Ccentralautologin%7Cext.cite.ux-enhancements%7Cext.cx.eventlogging.campaigns%7Cext.cx.model%7Cext.cx.uls.quick.actions%7Cext.dismissableSiteNotice%2CeventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.echo.centralauth%7Cext.growthExperiments.SuggestedEditSession%7Cext.quicksurveys.init%2Clib%7Cext.scribunto.errors%7Cext.tmh.OgvJsSupport%2Cplayer%7Cext.uls.common%2Cinterface%2Cpreferences%2Cwebfonts%7Cext.urlShortener.toolbar%7Cjquery%2Coojs%2Coojs-ui-core%2Coojs-ui-widgets%2Coojs-ui-windows%2Csite%7Cjquery.client%2Cspinner%2CtextSelection%7Cjquery.spinner.styles%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctoc%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.interface.helpers%7Cmediawiki.interface.helpers.linker.styles%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.media%2Cready%7Cmediawiki.page.watch.ajax%7Cmmv.bootstrap%2Ccodex%7Cmw.config.values.wbDataBridgeConfig%7Cmw.cx.SiteMapper%7Coojs-ui-core.icons%2Cstyles%7Coojs-ui-widgets.icons%7Coojs-ui-windows.icons%7Coojs-ui.styles.icons-interactions%2Cindicators%7Cskins.vector.clientPreferences%2Cjs%7Cskins.vector.icons.js%7Cwikibase.client.data-bridge.init%7Cwikibase.client.vector-2022&skin=vector-2022&version=fq828

Forced Style And Layout Duration: 1 ms

Invoker: TimerHandler:setTimeout
Invoker Type: user-callback
Window attribution: self
Source char position: 257485

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
10.7 ms	13.8 ms	53.2 ms	50.1 ms	3.1 ms
https://en.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022
Invoker: IdleRequestCallback Invoker Type: user-callback Source Function Name: doPropagation Window attribution: self Source char position: 4307
https://en.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022
Forced Style And Layout Duration: 15 ms Invoker: FrameRequestCallback Invoker Type: user-callback Source Function Name: flushCssBuffer Window attribution: self Source char position: 3233

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
0 ms	837.4 ms	17.7 ms	0 ms	17.7 ms
No availible script information.

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
0 ms	18.7 ms	39 ms	38.9 ms	0.1 ms
No availible script information.

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
0 ms	14.9 ms	39.4 ms	39.3 ms	0.1 ms
No availible script information.

Server timings

name	duration	description
cache	0	hit-remote
host	0	deployment-cache-text08

Custom metrics collected through JavaScript

There are no custom configured scripts.

Extra metrics collected using scripting

There are no custom extra metrics from scripting.

Visual Elements

Name	Display Time	X	Y	Width	Height
LargestImage (250px-President_Barack_Obama.jpg)	3.366 s	1161	661	220	275
<img alt="Obama standing with his arms folded and smiling" src="https://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/250px-President_Barack_Obama.jpg" decoding="async" width="220" height="275" class="mw-file-element" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/330px-President_Barack_Obama.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/500px-President_Barack_Obama.jpg 2x" data-file-width="2687" data-file-height="3356">
Heading	2.533 s	478	129	810	40
<h1 id="firstHeading" class="firstHeading mw-first-heading"></h1>
LargestContentfulPaint	3.366 s	478	455	948	384
<p></p>

PageXray

How the page is built.

Summary
HTTP version	HTTP/2.0
Total requests	100
Total domains	5
Total transfer size	1.5 MB
Total content size	4.2 MB
Responses missing compression	10
Number of cookies	1
Third party cookies	0

Requests per response code
200	98
302	2

Largest assets on the page (by transfer size)

URL	Type	Transfer Size	Content Size
https://en.wikipedia...bs.org/w/load.php	javascript	287.6 KB	1.2 MB
https://en.wikipedia...wiki/Barack_Obama	html	229.8 KB	1.4 MB
https://en.wikipedia...bs.org/w/load.php	javascript	120.7 KB	477.4 KB
https://upload.wikim...resident_-_v1.png	image	34.8 KB	33.9 KB
https://upload.wikim...-D-BP749-1327.jpg	image	34.0 KB	33.0 KB
https://upload.wikim...ign_trips.svg.png	image	27.9 KB	27.0 KB
https://en.wikipedia...bs.org/w/load.php	javascript	24.7 KB	114.9 KB
https://en.wikipedia...bs.org/w/load.php	css	23.8 KB	180.6 KB
https://upload.wikim..._Barack_Obama.jpg	image	22.1 KB	21.3 KB
https://upload.wikim...llege2012.svg.png	image	22.0 KB	21.1 KB
https://upload.wikim...n_Oval_Office.jpg	image	21.2 KB	20.3 KB
https://upload.wikim...tatistics.svg.png	image	20.8 KB	20.0 KB
https://upload.wikim...rsity_cropped.jpg	image	20.5 KB	19.6 KB
https://en.wikipedia...bs.org/w/load.php	javascript	20.0 KB	60.4 KB
https://upload.wikim...secretaries_2.jpg	image	19.6 KB	18.6 KB
https://upload.wikim...amiltondavis1.jpg	image	19.3 KB	18.5 KB
https://upload.wikim..._%28crop_2%29.jpg	image	18.9 KB	17.9 KB
https://upload.wikim...eting_2009-11.jpg	image	18.8 KB	17.9 KB
https://upload.wikim...5-09-29%29_04.jpg	image	18.7 KB	17.8 KB
https://upload.wikim...%2C_1963-2015.png	image	18.6 KB	17.6 KB

Requests and sizes per content type

Content	Transfer Size	Content Size	Requests
html	229.8 KB	1.4 MB	1
css	27.2 KB	189.1 KB	2
javascript	474.0 KB	1.9 MB	7
image	787.8 KB	725.1 KB	72
svg	17.9 KB	8.5 KB	16
Total	1.5 MB	4.2 MB	98

Data per domain

Domain	Total download time	Transfer Size	Content Size	Requests
en.wikipedia.beta.wmflabs.org	10.184 s	749.8 KB	3.5 MB	27
upload.wikimedia.org	41.862 s	783.2 KB	723.1 KB	69
upload.wikimedia.beta.wmflabs.org	619 ms	2.7 KB	884 B	2
login.wikimedia.beta.wmflabs.org	340 ms	N/A	0 b	1
auth.wikimedia.beta.wmflabs.org	309 ms	1.1 KB	254 B	1

Expires and last modified statistics

type	min	median	max
Expires	0 seconds	0 seconds	1 year
Last modified	1 day	40 weeks	11 years

Requests loaded after onLoad event

Included requests done after load event end.

Content	Transfer Size	Requests
html	0 b	0
css	0 b	0
javascript	0 b	0
image	1.9 KB	1
font	0 b	0
Total	1.9 KB	1

Requests loaded after onContentLoad

Includes requests done after DOM content loaded.

Content	Transfer Size	Requests
html	0 b	0
css	0 b	0
javascript	149.3 KB	4
image	3.0 KB	2
font	0 b	0
svg	10.6 KB	10
Total	162.8 KB	18

Render blocking requests

Render blocking information directly from Chrome.

Blocking	In body parser blocking	Potentially blocking
2	0	1

Render information

URL	Type
https://en.wikipedia...bs.org/w/load.php	non_blocking
https://en.wikipedia...bs.org/w/load.php	non_blocking
https://en.wikipedia...bs.org/w/load.php	non_blocking
https://en.wikipedia...bs.org/w/load.php	blocking
https://en.wikipedia...bs.org/w/load.php	potentially_blocking
https://en.wikipedia...bs.org/w/load.php	non_blocking
https://en.wikipedia...bs.org/w/load.php	blocking
https://en.wikipedia...bs.org/w/load.php	non_blocking
https://auth.wikimed...gin/checkLoggedIn	non_blocking
https://en.wikipedia...alAutoLogin/start	non_blocking
https://login.wikime...gin/checkLoggedIn	non_blocking

CPU Long Tasks | CPU Time Spent | CPU Time Spent Per Request |

CPU

Download the Chrome trace log and drag and drop it into Developer Tools / Performance in Chrome.

Download trace log

Long Tasks

Collected using the Long Task API. A long task is a task that take 50 milliseconds or more.

Type	Quantity	Total duration (ms)
Total Blocking Time		367
Max Potential First Input Delay		197
Long Tasks before First Paint	0	0
Long Tasks before First Contentful Paint	0	0
Long Tasks before Largest Contentful Paint	0	0
Long Tasks after Load Event End	0	0
Total Long Tasks	6	667

CPU last long task happened at 2.920 s

Individual Long Tasks

name	startTime	duration	containerType
self	1958	131	window
unknown	2092	197	window
self	2517	57	window
self	2589	130	window
self	2836	76	window
unknown	2920	76	window

CPU time spent

Calculated using Tracium.

Categories (ms)
parseHTML	213
styleLayout	666
paintCompositeRender	48
scriptParseCompile	4
scriptEvaluation	370
garbageCollection	12
other	427

Events (ms)
UpdateLayoutTree	401
FunctionCall	335
Layout	261
RunTask	227
ParseHTML	133
PrePaint	110
HTMLDocumentParser::MaybeFetchQueuedPreloads	86
Paint	40
DecodedDataDocumentParser::AppendBytes	19
v8.run	17
CpuProfiler::StartProfiling	14
DocumentLoader::BodyLoadingFinished	13
Layerize	12

Time spent per request

URL	CPU time (ms)
https://en.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022	372
https://en.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=ext.centralNotice.choiceData%2CgeoIP%2CstartUp%7Cext.centralauth.ForeignApi%2Ccentralautologin%7Cext.cite.ux-enhancements%7Cext.cx.eventlogging.campaigns%7Cext.cx.model%7Cext.cx.uls.quick.actions%7Cext.dismissableSiteNotice%2CeventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.echo.centralauth%7Cext.growthExperiments.SuggestedEditSession%7Cext.quicksurveys.init%2Clib%7Cext.scribunto.errors%7Cext.tmh.OgvJsSupport%2Cplayer%7Cext.uls.common%2Cinterface%2Cpreferences%2Cwebfonts%7Cext.urlShortener.toolbar%7Cjquery%2Coojs%2Coojs-ui-core%2Coojs-ui-widgets%2Coojs-ui-windows%2Csite%7Cjquery.client%2Cspinner%2CtextSelection%7Cjquery.spinner.styles%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctoc%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.interface.helpers%7Cmediawiki.interface.helpers.linker.styles%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.media%2Cready%7Cmediawiki.page.watch.ajax%7Cmmv.bootstrap%2Ccodex%7Cmw.config.values.wbDataBridgeConfig%7Cmw.cx.SiteMapper%7Coojs-ui-core.icons%2Cstyles%7Coojs-ui-widgets.icons%7Coojs-ui-windows.icons%7Coojs-ui.styles.icons-interactions%2Cindicators%7Cskins.vector.clientPreferences%2Cjs%7Cskins.vector.icons.js%7Cwikibase.client.data-bridge.init%7Cwikibase.client.vector-2022&skin=vector-2022&version=fq828	217

URL

CPU time (ms)

https://en.wikipedia.beta.wmflabs.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022

372

217

Page summary

https://en.wikipedia.beta.wmflabs.org/wiki/Barack_Obama

Summary

Timings Summary

Waterfall

Video

Filmstrip

Coach

Coach score

Performance advice (72)

Best practice advice (66)

Privacy advice (94)

Page info

Technologies used to build the page.

Visual Metrics

Browser Metrics

Largest Contentful Paint

Detected Cumulative Layout Shift

Long Animation Frames

Server timings

Custom metrics collected through JavaScript

Extra metrics collected using scripting

Visual Elements

PageXray

Largest assets on the page (by transfer size)

Requests and sizes per content type

Data per domain

Expires and last modified statistics

Requests loaded after onLoad event

Requests loaded after onContentLoad

Render blocking requests

Render information

CPU

Long Tasks

Individual Long Tasks

CPU time spent

Time spent per request