Run 4 for https://en.wikipedia.org/wiki/Barack

Summary

Metric	Value
Page metrics
Performance score	74
Total page size	1.0 MB
Requests	72
Timing metrics
TTFB	118 ms
First Paint	931 ms
Fully Loaded	9.899 s
Google Web Vitals
TTFB	118 ms
First Contentful Paint (FCP)	931 ms
Largest Contentful Paint (LCP)	931 ms
Cumulative Layout Shift (CLS)	0.16
800 ms
Total Blocking Time	571 ms
Max Potential FID	332 ms
CPU metrics
CPU long tasks	6
CPU last long task happens at	9.209 s
Visual Metrics
First Visual Change	934 ms
Speed Index	2.442 s
Visual Complete 85%	9.567 s
Visual Complete 99%	12.300 s
Last Visual Change	13.467 s

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| Waterfall | | Download HAR |

Waterfall

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Video

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| Filmstrip |

Filmstrip

Use--filmstrip.showAll to show all filmstrips.

0 s

0.2 smwStartup 147 ms

0.5 sCPU Long Task duration 453 ms

1 sDOM Content Loaded Time 926 msFirst Contentful Paint 931 msLCP <P> 931 msFirst Visual Change 934 ms

1.1 sCPU Long Task duration 91 ms

1.2 sCPU Long Task duration 63 ms

1.4 sCPU Long Task duration 80 ms

1.5 smwCentralNoticeBanner 1.476 s

1.7 sPage Load Time 1.602 sCPU Long Task duration 332 ms

2 s

9.3 sCPU Long Task duration 255 ms

9.4 s

9.5 sLayout Shift 0.03318 9.477 s

9.6 sLayout Shift 0.00539 9.505 sLayout Shift 0.02063 9.545 sVisual Complete 85% 9.567 sLayout Shift 0.01745 9.578 s

9.7 sLayout Shift 0.00870 9.603 sLayout Shift 0.01525 9.632 sLayout Shift 0.01203 9.672 sLayout Shift 0.00931 9.697 s

9.8 sLayout Shift 0.00419 9.721 sLayout Shift 0.00664 9.743 sLayout Shift 0.00284 9.762 sLayout Shift 0.00280 9.793 s

9.9 sLayout Shift 0.00450 9.821 sLayout Shift 0.00376 9.843 sLayout Shift 0.00188 9.871 sLayout Shift 0.00152 9.889 sFully Loaded 9.899 s

10 sLayout Shift 0.00282 9.911 sLayout Shift 0.00235 9.977 s

10.1 sLayout Shift 0.00058 10.040 s

10.2 s

10.3 sLargest Image 10.234 sHeading 10.234 s

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10.8 sVisual Complete 95% 10.767 s

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11 s

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12.3 sVisual Complete 99% 12.300 s

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13.5 sLast Visual Change 13.467 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 8.0.2.

Coach score

Total score 79
Performance score 74
Privacy score 88
Best practice score 80

Performance advice (74)

Title

Advice

Score

Don't scale images in the browser (avoidScalingImages)

The page has 2 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.org/static/images/mobile/copyright/wikipedia-wordmark-en.svg

https://en.wikipedia.org/static/images/mobile/copyright/wikipedia-tagline-en.svg

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 6 CPU long tasks with the total of 1.274 s. The total blocking time is 571 ms and 1 long task before first contentful paint with total time of 453 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

Avoid extra requests by setting cache headers (cacheHeaders)

The page has 62 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 640.3 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/en/thumb/1/1b/Semi-protection-shackle.svg...n-shackle.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/9/97/President_Barack_Obama...8cropped%29_4.jpg

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

https://upload.wikimedia.org/wikipedia/en/thumb/3/33/Ann_Dunham_with_father_and_..._and_children.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/9/99/Barry_Soetoro_school_r...school_record.jpg

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

https://upload.wikimedia.org/wikipedia/commons/thumb/2/26/Obama_family_portrait_...he_Green_Room.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/b/b6/Obamamiltondavis1.jpg/...amiltondavis1.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Chicago%2C_November_2%...5471954323%29.jpg

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

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

https://upload.wikimedia.org/wikipedia/commons/thumb/e/e9/Official_portrait_of_B..._Barack_Obama.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/4/4b/Barack_Obama_visiting_...rora_shooting.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/9/9f/Job_Growth_by_U.S._Pre...resident_-_v1.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/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/9/99/P06409PS-0571_%2835946...3594694537%29.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Barack_Obama%27s_trip_..._2016_%289%29.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/7/70/Barack_Obama_with_Afgh...and_Joe_Biden.jpg

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

https://upload.wikimedia.org/wikipedia/commons/thumb/f/f6/Handshake_between_the_...C3%BAl_Castro.jpg

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

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

https://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Vladimir_Putin_and_Bar...5-09-29%29_01.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/9/96/Obama_Macri_October_20..._October_2017.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/1/15/P20220405AS-1082_%2852...2067439422%29.jpg

https://upload.wikimedia.org/wikipedia/en/thumb/6/69/P_vip.svg/28px-P_vip.svg.png

https://upload.wikimedia.org/wikipedia/en/thumb/a/a4/Flag_of_the_United_States.s...ed_States.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Flag_of_Hawaii.svg/32p...of_Hawaii.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/9/9b/Flag_of_Chicago%2C_Ill..._Illinois.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/0/01/Flag_of_Illinois.svg/3..._Illinois.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/1/17/Balance%2C_by_David.sv..._by_David.svg.png

https://upload.wikimedia.org/wikipedia/en/thumb/0/01/A_coloured_voting_box.svg/2...oting_box.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/c/c1/Blue_iPod_Nano.jpg/12px-Blue_iPod_Nano.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/8/87/IPhone_5.svg/13px-IPhone_5.svg.png

https://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/20px-Commons-logo.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/2/24/Wikinews-logo.svg/27px...news-logo.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/26...urce-logo.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Wikidata-logo.svg/27px...data-logo.svg.png

https://upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progr...ogressive.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/2/21/Speaker_Icon.svg/15px-Speaker_Icon.svg.png

https://upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/1...ory_class.svg.png

https://upload.wikimedia.org/wikipedia/en/thumb/d/db/Symbol_list_class.svg/16px-...ist_class.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/4/4b/Michelle_Obama_2013_of...cial_portrait.jpg

https://upload.wikimedia.org/wikipedia/en/thumb/e/ed/Nobel_Prize.png/80px-Nobel_Prize.png

https://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikiquote-logo.svg/23p...uote-logo.svg.png

https://upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg

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

https://upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg

https://upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg

https://meta.wikimedia.org/w/index.php...a.org/w/index.php

Long cache headers is good (cacheHeadersLong)

The page has 2 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.org/w/load.php...ia.org/w/load.php

https://en.wikipedia.org/api/rest_v1/page/summary/Barack_(disambiguation)

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

The total JavaScript transfer size is 213.1 kB and the uncompressed size is 750.5 kB. This is quite large.

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.org/w/load.php...ia.org/w/load.php	71.9 KB	265.2 KB
https://meta.wikimedia.org/w/index.php...a.org/w/index.php	82.2 KB	321.4 KB
https://en.wikipedia.org/w/load.php?lang=en&modules=vue&skin=vector-2022&version=n99vv	54.1 KB	146.3 KB

Make each CSS response small (optimalCssSize)

https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.styles%7Cext.phonos.icons%2Cstyles%7Cext.tmh.player.styles%7Cext.uls.interlanguage%7Cext.visualEditor.desktopArticleTarget.noscript%7Cext.wikimediaBadges%7Cext.wikimediamessages.styles%7Cjquery.makeCollapsible.styles%7Cskins.vector.icons%2Cstyles%7Cskins.vector.search.codex.styles%7Cwikibase.client.init&only=styles&skin=vector-2022 size is 24 kB (23971) 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.org/w/load.php...ia.org/w/load.php	23.4 KB	182.6 KB

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

The page has 2 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.org/wiki/Barack_Obama

https://meta.wikimedia.org/w/index.php...a.org/w/index.php

Best practice advice (80)

Title	Advice	Score
Cumulative Layout Shift (cumulativeLayoutShift)	You have a cumulative layout shift score (0.1558) 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.
Avoid unnecessary headers (unnecessaryHeaders)	There are 4 responses that sets both a max-age and expires header. There are 72 responses that sets a server header.	24
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.org/wiki/Barack_Obama https://en.wikipedia.org/w/load.php...ia.org/w/load.php https://en.wikipedia.org/w/load.php...ia.org/w/load.php https://upload.wikimedia.org/wikipedia/en/thumb/1/1b/Semi-protection-shackle.svg...n-shackle.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/9/97/President_Barack_Obama...8cropped%29_4.jpg https://en.wikipedia.org/w/load.php...ia.org/w/load.php https://en.wikipedia.org/w/load.php...ia.org/w/load.php https://upload.wikimedia.org/wikipedia/commons/thumb/3/36/Seal_of_the_President_...ed_States.svg.png https://upload.wikimedia.org/wikipedia/en/thumb/3/33/Ann_Dunham_with_father_and_..._and_children.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/9/99/Barry_Soetoro_school_r...school_record.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Nuvola_apps_kaboodle.s..._kaboodle.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/2/26/Obama_family_portrait_...he_Green_Room.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/b/b6/Obamamiltondavis1.jpg/...amiltondavis1.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Chicago%2C_November_2%...5471954323%29.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/f/f1/BarackObamaportrait.jp...Obamaportrait.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/2/24/ElectoralCollege2008.s...llege2008.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/e/e9/Official_portrait_of_B..._Barack_Obama.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/4/4b/Barack_Obama_visiting_...rora_shooting.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/9/9f/Job_Growth_by_U.S._Pre...resident_-_v1.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/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/9/99/P06409PS-0571_%2835946...3594694537%29.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Barack_Obama%27s_trip_..._2016_%289%29.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/7/70/Barack_Obama_with_Afgh...and_Joe_Biden.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/a/ac/Obama_and_Biden_await_..._on_bin_Laden.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/f/f6/Handshake_between_the_...C3%BAl_Castro.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Barack_Obama_welcomes_...e_Oval_Office.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/1/17/Barack_Obama_talks_wit...8637772147%29.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Vladimir_Putin_and_Bar...5-09-29%29_01.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/9/96/Obama_Macri_October_20..._October_2017.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/1/15/P20220405AS-1082_%2852...2067439422%29.jpg https://upload.wikimedia.org/wikipedia/en/thumb/6/69/P_vip.svg/28px-P_vip.svg.png https://upload.wikimedia.org/wikipedia/en/thumb/a/a4/Flag_of_the_United_States.s...ed_States.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Flag_of_Hawaii.svg/32p...of_Hawaii.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/9/9b/Flag_of_Chicago%2C_Ill..._Illinois.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/0/01/Flag_of_Illinois.svg/3..._Illinois.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/1/17/Balance%2C_by_David.sv..._by_David.svg.png https://upload.wikimedia.org/wikipedia/en/thumb/0/01/A_coloured_voting_box.svg/2...oting_box.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/c/c1/Blue_iPod_Nano.jpg/12px-Blue_iPod_Nano.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/8/87/IPhone_5.svg/13px-IPhone_5.svg.png https://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/20px-Commons-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/2/24/Wikinews-logo.svg/27px...news-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/26...urce-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Wikidata-logo.svg/27px...data-logo.svg.png https://upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progr...ogressive.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/2/21/Speaker_Icon.svg/15px-Speaker_Icon.svg.png https://upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/1...ory_class.svg.png https://upload.wikimedia.org/wikipedia/en/thumb/d/db/Symbol_list_class.svg/16px-...ist_class.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/4/4b/Michelle_Obama_2013_of...cial_portrait.jpg https://upload.wikimedia.org/wikipedia/en/thumb/e/ed/Nobel_Prize.png/80px-Nobel_Prize.png https://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikiquote-logo.svg/23p...uote-logo.svg.png https://en.wikipedia.org/w/skins/Vector/resources/skins.vector.styles/images/arr...n-progressive.svg https://en.wikipedia.org/w/skins/Vector/resources/skins.vector.styles/images/lin...r-progressive.svg https://en.wikipedia.org/w/resources/src/mediawiki.skinning/images/magnify-clip-ltr.svg?8330e https://upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg https://upload.wikimedia.org/wikipedia/commons/4/4d/Icon_pdf_file.png https://en.wikipedia.org/w/load.php...ia.org/w/load.php https://en.wikipedia.org/w/load.php...ia.org/w/load.php https://upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg https://upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg https://meta.wikimedia.org/w/index.php...a.org/w/index.php https://en.wikipedia.org/w/load.php?lang=en&modules=vue&skin=vector-2022&version=n99vv https://en.wikipedia.org/w/load.php?lang=en&modules=vue&skin=vector-2022&version=n99vv https://en.wikipedia.org/beacon/impression...beacon/impression https://en.wikipedia.org/api/rest_v1/page/summary/Barack_(disambiguation)

Privacy advice (88)

Title	Advice	Score
Use a good Content-Security-Policy header to make sure you you avoid Cross Site Scripting (XSS) attacks. (contentSecurityPolicyHeader)	Set a Content-Security-Policy header to make sure you are not open for Cross Site Scripting (XSS) attacks. You can start with setting a Content-Security-Policy-Report-Only header, that will only report the violation, not stop the download.	0
Description: Content Security Policy is delivered via a HTTP response header, and defines approved sources of content that the browser may load. It can be an effective countermeasure to Cross Site Scripting (XSS) attacks and is also widely supported and usually easily deployed. https://scotthelme.co.uk/content-security-policy-an-introduction/.
Offenders: https://en.wikipedia.org/wiki/Barack_Obama
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.org/wiki/Barack_Obama

Page info

Page info
Title	Barack Obama - Wikipedia
Generator	MediaWiki 1.44.0-wmf.3
Width	1904
Height	56753
DOM elements	21693
Avg DOM depth	17
Max DOM depth	32
Iframes	0
Script tags	6
Local storage	1.0 MB
Session storage	0 b
Network Information API	3g

Resource Hints
dns-prefetch
https://meta.wikimedia.org/
https://login.wikimedia.org/
preconnect
https://upload.wikimedia.org/

Technologies used to build the page.

Data collected using Wappalyzerversion 6.10.66. Use --browsertime.firefox.includeResponseBodies htmlor --browsertime.chrome.includeResponseBodies htmlto help Wappalyser find more information about technologies used.

Technology	Confidence	Category
MediaWiki	100	Wikis
PHP	100	Programming languages
Apache Traffic Server 9.2.5	100	Web servers
HSTS	100	Security

Visual Metrics

Visual Metrics
First Visual Change	934 ms
Speed Index	2.442 s
Largest Image	10.234 s
Heading	10.234 s
Last Meaningful Paint	10.234 s
Visual Complete 85%	9.567 s
Visual Complete 95%	10.767 s
Visual Complete 99%	12.300 s
Last Visual Change	13.467 s
Visual Readiness	12.533 s

Browser Metrics

Navigation Timing
backEndTime	118 ms
domContentLoadedTime	926 ms
domInteractiveTime	926 ms
domainLookupTime	0 ms
frontEndTime	1.223 s
pageDownloadTime	260 ms
pageLoadTime	1.602 s
redirectionTime	0 ms
serverConnectionTime	0 ms
serverResponseTime	373 ms

Google Web Vitals
Time to first byte (TTFB)	118 ms
First Contentful Paint (FCP)	931 ms
Largest Contentful Paint (LCP)	931 ms
Cumulative Layout Shift (CLS)	0.16
Interaction to next paint (INP)	800 ms
Total Blocking Time (TBT)	571 ms

First Contentful Paint info
Elements that needed recalculate style before FCP	15535
Time spent in recalculate style before FCP	220.41 ms

Extra timings
TTFB	118 ms
First Paint	931 ms
Load Event End	1.602 s
Fully loaded	9.899 s

User Timing marks
mwStartup	147 ms
mwCentralNoticeBanner	1.476 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	931 ms
Elements that needed recalculate style before LCP	15535
Time spent in recalculate style before LCP	220.41 ms
Load time	0 ms
*Size (widthheight)**	186600
DOM path
div:eq(2) > div > div:eq(2) > main#content > div#bodyContent > div#mw-content-text > div:eq(0) > p:eq(3)> div:eq(2) > 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

0.15581 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
0.03318	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<span class="cdx-text-input__icon cdx-text-input__start-icon"></span>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(1) > header > div:eq(1) > div#p-search > div > div > form#searchform > div#simpleSearch > div > span,body > div:eq(2)
0.02063	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<span class="cdx-text-input__icon cdx-text-input__start-icon"></span>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(1) > header > div:eq(1) > div#p-search > div > div > form#searchform > div#simpleSearch > div > span,body > div:eq(2)
0.01745	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<span class="cdx-text-input__icon cdx-text-input__start-icon"></span>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(1) > header > div:eq(1) > div#p-search > div > div > form#searchform > div#simpleSearch > div > span,body > div:eq(2)
0.01525	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<span class="cdx-text-input__icon cdx-text-input__start-icon"></span>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(1) > header > div:eq(1) > div#p-search > div > div > form#searchform > div#simpleSearch > div > span,body > div:eq(2)
0.01203	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<span class="cdx-text-input__icon cdx-text-input__start-icon"></span>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(1) > header > div:eq(1) > div#p-search > div > div > form#searchform > div#simpleSearch > div > span,body > div:eq(2)
0.00931	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(2)
0.00870	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(2)
0.00664	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(2)
0.00539	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(2)
0.00450	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(2)
0.00419	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(2)
0.00376	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(2)
0.00284	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(2)
0.00282	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(2)
0.00280	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(2)
0.00235	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(2)
0.00188	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(2)
0.00152	<div id="wmde-banner-app" data-v-app=""></div>,<header class="vector-header mw-header"></header>,<div class="mw-page-container"></div>
body > div#wmde-banner-app,body > div:eq(1) > header,body > div:eq(2)
0.00058	<div id="wmde-banner-app" data-v-app=""></div>
body > div#wmde-banner-app

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.

Interaction to Next Paint

Interaction to Next Paint (INP) is a metric that try to measure responsiveness. It's useful if you are testing user journeys. Read more about Interaction to Next Paint.

The measured latency was 800 ms.

Event type	pointerover
Element type	P
Element class name
Event target	#mw-content-text>div.mw-content-ltr.mw-parser-output>p
Load state when the event happened	loading

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
403 ms	697.3 ms	26.7 ms	0.2 ms	26.5 ms
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022
Invoker: https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022 Invoker Type: classic-script Window attribution: self
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022
Invoker: IdleRequestCallback Invoker Type: user-callback Window attribution: self Source char position: 14426

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
301 ms	332.1 ms	18.9 ms	4.9 ms	14 ms
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022
Forced Style And Layout Duration: 264 ms Invoker: IdleRequestCallback Invoker Type: user-callback Source Function Name: doPropagation Window attribution: self Source char position: 4309

Blocking duration

Work duration

Render duration

PreLayout Duration

Style And Layout Duration

301 ms

332.1 ms

18.9 ms

4.9 ms

14 ms

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

Forced Style And Layout Duration: 264 ms

Invoker: IdleRequestCallback
Invoker Type: user-callback
Source Function Name: doPropagation
Window attribution: self
Source char position: 4309

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
207 ms	255.9 ms	1.1 ms	0 ms	1.1 ms
Forced Style And Layout Duration: 251 ms Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 162788

Blocking duration

Work duration

Render duration

PreLayout Duration

Style And Layout Duration

207 ms

255.9 ms

1.1 ms

0 ms

1.1 ms

Forced Style And Layout Duration: 251 ms

Invoker: TimerHandler:setTimeout
Invoker Type: user-callback
Window attribution: self
Source char position: 162788

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
105 ms	116.4 ms	62.6 ms	60.9 ms	1.7 ms
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.cx.model%7Cext.cx.uls.quick.actions%7Cext.phonos.init%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cext.uls.common%7Cjquery%7Cjquery.makeCollapsible%7Cjquery.uls.data%7Cmediawiki.page.media%7Cmediawiki.toc%7Cmw.cx.SiteMapper%7Coojs-ui.styles.icons-interactions&skin=vector-2022&version=y0y53
Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 68844
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.cx.model%7Cext.cx.uls.quick.actions%7Cext.phonos.init%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cext.uls.common%7Cjquery%7Cjquery.makeCollapsible%7Cjquery.uls.data%7Cmediawiki.page.media%7Cmediawiki.toc%7Cmw.cx.SiteMapper%7Coojs-ui.styles.icons-interactions&skin=vector-2022&version=y0y53
Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 68844

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
33 ms	9.7 ms	80.3 ms	78.8 ms	1.5 ms
No availible script information.

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
29 ms	72.8 ms	43.2 ms	33.2 ms	10 ms
https://en.wikipedia.org/w/load.php?lang=en&modules=skins.vector.js&skin=vector-2022&version=zpy1w
Forced Style And Layout Duration: 6 ms Invoker: IntersectionObserverCallback Invoker Type: user-callback Window attribution: self Source char position: 34173
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.cx.model%7Cext.cx.uls.quick.actions%7Cext.phonos.init%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cext.uls.common%7Cjquery%7Cjquery.makeCollapsible%7Cjquery.uls.data%7Cmediawiki.page.media%7Cmediawiki.toc%7Cmw.cx.SiteMapper%7Coojs-ui.styles.icons-interactions&skin=vector-2022&version=y0y53
Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 68844

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
14 ms	40.3 ms	32.7 ms	11.3 ms	21.4 ms
https://en.wikipedia.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: 4309
https://en.wikipedia.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: 3231

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
5 ms	11.9 ms	48.1 ms	43.2 ms	4.9 ms
https://en.wikipedia.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: 4309
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022
Forced Style And Layout Duration: 8 ms Invoker: FrameRequestCallback Invoker Type: user-callback Source Function Name: flushCssBuffer Window attribution: self Source char position: 3231

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
0 ms	38.5 ms	22.5 ms	0 ms	22.5 ms
No availible script information.

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
0 ms	51.5 ms	7.5 ms	5.8 ms	1.7 ms
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.cx.model%7Cext.cx.uls.quick.actions%7Cext.phonos.init%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cext.uls.common%7Cjquery%7Cjquery.makeCollapsible%7Cjquery.uls.data%7Cmediawiki.page.media%7Cmediawiki.toc%7Cmw.cx.SiteMapper%7Coojs-ui.styles.icons-interactions&skin=vector-2022&version=y0y53
Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 68844

Server timings

name	duration	description
cache	0	hit-front
host	0	cp3067

Custom metrics collected through JavaScript

There are no custom configured scripts.

Extra metrics collected using scripting

There are no custom extra metrics from scripting.

CDP Performance

name	value
AudioHandlers	0
AudioWorkletProcessors	0
Documents	22
Frames	20
JSEventListeners	2190
LayoutObjects	27504
MediaKeySessions	0
MediaKeys	0
Nodes	47673
Resources	115
ContextLifecycleStateObservers	28
V8PerContextDatas	2
WorkerGlobalScopes	0
UACSSResources	3
RTCPeerConnections	0
ResourceFetchers	22
AdSubframes	0
DetachedScriptStates	0
ArrayBufferContents	1
LayoutCount	222
RecalcStyleCount	235
LayoutDuration	453
RecalcStyleDuration	900
DevToolsCommandDuration	39
ScriptDuration	408
V8CompileDuration	9
TaskDuration	3084
TaskOtherDuration	1275
ThreadTime	4
ProcessTime	10
JSHeapUsedSize	16320912
JSHeapTotalSize	21000192
FirstMeaningfulPaint	931

Visual Elements

Name	Display Time	X	Y	Width	Height
LargestImage (220px-President_Barack_Obama.jpg)	10.234 s	1161	668	220	275
<img alt="Obama standing in the Oval Office with his arms folded and smiling" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/220px-President_Barack_Obama.jpg" decoding="async" width="220" height="275" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/330px-President_Barack_Obama.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/440px-President_Barack_Obama.jpg 2x" data-file-width="2687" data-file-height="3356">
Heading	10.234 s	478	445	787	40
<h1 id="firstHeading" class="firstHeading mw-first-heading"></h1>

PageXray

How the page is built.

Summary
HTTP version	HTTP/2.0
Total requests	72
Total domains	3
Total transfer size	1.0 MB
Total content size	3.0 MB
Responses missing compression	6
Number of cookies	2
Third party cookies	0

Requests per response code
200	71
204	1

Largest assets on the page (by transfer size)

URL	Type	Transfer Size	Content Size
https://en.wikipedia...wiki/Barack_Obama	html	289.8 KB	1.6 MB
https://meta.wikimed...a.org/w/index.php	javascript	82.2 KB	321.4 KB
https://en.wikipedia...ia.org/w/load.php	javascript	71.9 KB	265.2 KB
https://en.wikipedia...ia.org/w/load.php	javascript	54.1 KB	146.3 KB
https://upload.wikim...llege2012.svg.png	image	31.4 KB	30.5 KB
https://en.wikipedia...ia.org/w/load.php	css	23.4 KB	182.6 KB
https://upload.wikim..._Barack_Obama.jpg	image	22.7 KB	21.9 KB
https://upload.wikim...school_record.jpg	image	18.9 KB	18.0 KB
https://upload.wikim...llege2008.svg.png	image	18.8 KB	17.9 KB
https://upload.wikim...5471954323%29.jpg	image	18.4 KB	17.5 KB
https://upload.wikim..._2016_%289%29.jpg	image	18.2 KB	17.3 KB
https://upload.wikim...resident_-_v1.png	image	17.9 KB	17.0 KB
https://upload.wikim...e_-_2009Jan20.jpg	image	16.1 KB	15.2 KB
https://upload.wikim..._and_children.jpg	image	16.0 KB	15.1 KB
https://upload.wikim...amiltondavis1.jpg	image	15.8 KB	14.9 KB
https://upload.wikim...3594694537%29.jpg	image	15.6 KB	14.8 KB
https://upload.wikim...ses_2001-2010.png	image	15.6 KB	14.7 KB
https://upload.wikim...2067439422%29.jpg	image	15.6 KB	14.7 KB
https://upload.wikim..._on_bin_Laden.jpg	image	15.3 KB	14.5 KB
https://upload.wikim...rora_shooting.jpg	image	15.0 KB	14.1 KB

Requests and sizes per content type

Content	Transfer Size	Content Size	Requests
html	289.8 KB	1.6 MB	1
css	23.4 KB	182.6 KB	1
javascript	208.1 KB	732.9 KB	3
image	539.1 KB	488.6 KB	58
svg	8.1 KB	4.3 KB	7
plain	546 B	0 b	1
json	2.0 KB	1.4 KB	1
Total	1.0 MB	3.0 MB	72

Data per domain

Domain	Total download time	Transfer Size	Content Size	Requests
en.wikipedia.org	1.975 s	445.7 KB	2.2 MB	10
upload.wikimedia.org	57.956 s	543.1 KB	491.6 KB	61
meta.wikimedia.org	214 ms	82.2 KB	321.4 KB	1

Expires and last modified statistics

type	min	median	max
Expires	0 seconds	0 seconds	1 year
Last modified	2 minutes	23 weeks	11 years

Console log

The page logs the following messages to the console.

Level	Message
WARNING	https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022 11:274 "This page is using the deprecated ResourceLoader module \"mediawiki.Uri\".\n[1.43] Please use browser native URL."
SEVERE	https://en.wikipedia.org/w/load.php?lang=en&modules=skins.vector.search.codex.scripts%7Cvue&skin=vector-2022&version=148qw 153 Error: <path> attribute transform: Expected transform function, "none".
WARNING	https://en.wikipedia.org/wiki/Main_Page - The resource https://en.wikipedia.org/static/images/project-logos/enwiki.png was preloaded using link preload but not used within a few seconds from the window's load event. Please make sure it has an appropriate `as` value and it is preloaded intentionally.
WARNING	https://en.wikipedia.org/wiki/Main_Page - The resource https://en.wikipedia.org/static/images/project-logos/enwiki.png was preloaded using link preload but not used within a few seconds from the window's load event. Please make sure it has an appropriate `as` value and it is preloaded intentionally.
WARNING	https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022 11:274 "This page is using the deprecated ResourceLoader module \"mediawiki.Uri\".\n[1.43] Please use browser native URL."
SEVERE	https://en.wikipedia.org/w/load.php?lang=en&modules=vue&skin=vector-2022&version=n99vv 87 Error: <path> attribute transform: Expected transform function, "none".

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	0 b	0
font	0 b	0
json	2.0 KB	1
Total	2.0 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	136.3 KB	2
image	0 b	0
font	0 b	0
plain	546 B	1
json	2.0 KB	1
Total	138.8 KB	4

Render blocking requests

Render blocking information directly from Chrome.

Blocking	In body parser blocking	Potentially blocking
1	0	0

Render information

URL	Type
https://meta.wikimed...a.org/w/index.php	non_blocking
https://en.wikipedia...ia.org/w/load.php	non_blocking
https://en.wikipedia...ia.org/w/load.php	non_blocking
https://en.wikipedia...ia.org/w/load.php	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		571
Max Potential First Input Delay		332
Long Tasks before First Paint	1	453
Long Tasks before First Contentful Paint	1	453
Long Tasks before Largest Contentful Paint	1	453
Long Tasks after Load Event End	2	587
Total Long Tasks	6	1274

CPU last long task happened at 9.209 s

Individual Long Tasks

name	startTime	duration	containerType
unknown	407	453	window
self	1079	91	window
unknown	1173	63	window
unknown	1363	80	window
self	1606	332	window
self	9209	255	window

CPU time spent

Calculated using Tracium.

Categories (ms)
parseHTML	102
styleLayout	1344
paintCompositeRender	220
scriptParseCompile	9
scriptEvaluation	408
garbageCollection	31
other	1120

Events (ms)
UpdateLayoutTree	905
PrePaint	492
Layout	437
FunctionCall	358
RunTask	270
CpuProfiler::StartProfiling	168
Paint	140
Layerize	107
ParseHTML	98
HitTest	51
RunMicrotasks	22
Commit	22
PaintImage	20
DocumentLoader::BodyLoadingFinished	18
IntersectionObserverController::computeIntersections	16

Time spent per request

URL	CPU time (ms)
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022	428
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.cx.model%7Cext.cx.uls.quick.actions%7Cext.phonos.init%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cext.uls.common%7Cjquery%7Cjquery.makeCollapsible%7Cjquery.uls.data%7Cmediawiki.page.media%7Cmediawiki.toc%7Cmw.cx.SiteMapper%7Coojs-ui.styles.icons-interactions&skin=vector-2022&version=y0y53	178
https://meta.wikimedia.org/w/index.php?title=Special:BannerLoader&campaign=C24_WMDE_Desktop_EN_04&banner=B24_WMDE_Desktop_EN_04_var&uselang=en&debug=false	23

| afterPageCompleteCheck.jpg | layoutShift.jpg | largestContentfulPaint.jpg |

Screenshots

afterPageCompleteCheck.jpg

layoutShift.jpg

largestContentfulPaint.jpg

Run 4 summary

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

Summary

Waterfall

Video

Filmstrip

Coach

Coach score

Performance advice (74)

Best practice advice (80)

Privacy advice (88)

Page info

Technologies used to build the page.

Visual Metrics

Browser Metrics

Largest Contentful Paint

Detected Cumulative Layout Shift

Interaction to Next Paint

Long Animation Frames

Server timings

Custom metrics collected through JavaScript

Extra metrics collected using scripting

CDP Performance

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

Console log

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

Screenshots