Run 1 for https://en.wikipedia.org/wiki/Barack

Summary

Metric	Value
Page metrics
Performance score	79
Total page size	464.5 KB
Requests	22
Timing metrics
TTFB	2.155 s
First Paint	3.020 s
Fully Loaded	5.916 s
Google Web Vitals
TTFB	2.155 s
First Contentful Paint (FCP)	3.020 s
Largest Contentful Paint (LCP)	3.432 s
Cumulative Layout Shift (CLS)	0.25
Total Blocking Time	1.438 s
Max Potential FID	398 ms
CPU metrics
CPU long tasks	18
CPU last long task happens at	6.365 s
Visual Metrics
First Visual Change	3.033 s
Speed Index	3.492 s
Visual Complete 85%	3.467 s
Visual Complete 99%	6.067 s
Last Visual Change	6.067 s

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| Waterfall | | Download HAR |

Waterfall

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| Video | Download |

Video

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| Filmstrip |

Filmstrip

Use--filmstrip.showAll to show all filmstrips.

0 s

2.5 sCPU Long Task duration 84 msmwStartup 2.475 s

2.9 sCPU Long Task duration 147 ms

3.1 sFirst Contentful Paint 3.020 sFirst Visual Change 3.033 sLargest Image 3.033 s

3.2 s

3.3 sCPU Long Task duration 80 ms

3.4 sCPU Long Task duration 102 ms

3.5 sLCP <P> 3.432 sCPU Long Task duration 77 msVisual Complete 85% 3.467 s

3.6 s

3.7 sCPU Long Task duration 260 ms

3.8 s

3.9 s

4 sCPU Long Task duration 91 ms

4.1 sDOM Content Loaded Time 4.034 sPage Load Time 4.055 s

4.2 s

4.3 sCPU Long Task duration 127 ms

4.4 s

4.5 sCPU Long Task duration 67 ms

4.6 sCPU Long Task duration 398 ms

4.7 s

4.8 s

4.9 s

5 sCPU Long Task duration 58 ms

5.1 sCPU Long Task duration 75 ms

5.2 sCPU Long Task duration 321 ms

5.5 sCPU Long Task duration 259 ms

5.7 s

5.8 smwCentralNoticeBanner 5.796 s

5.9 sCPU Long Task duration 79 msLayout Shift 0.24675 5.858 s

6 sFully Loaded 5.916 sVisual Complete 95% 5.967 sHeading 5.967 s

6.1 sCPU Long Task duration 137 msLast Visual Change 6.067 sVisual Complete 99% 6.067 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 8.1.3.

Coach score

Total score 82
Performance score 79
Privacy score 88
Best practice score 81

Performance advice (79)

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-25.svg

Have a fast first contentful paint (firstContentfulPaint)

First contentful paint is poor (3.020 s). It is in the Google Web Vitals poor range, slower than 3 seconds.The page has a high time to first byte (TTFB) 2.155 s that you should look into to improve first contentful paint.

Description: The First Contentful Paint (FCP) metric measures the time from when the page starts loading to when any part of the page content is rendered on the screen. For this metric, "content" refers to text, images (including background images), <svg> elements, or non-white <canvas> elements.

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.

Have a fast largest contentful paint (largestContentfulPaint)

Largest contentful paint can be improved 3.432 s. It is in the Google Web Vitals needs improvement range, slower than 2.5 seconds.

Description: Largest contentful paint is one of Google Web Vitals and reports the render time of the largest image or text block visible within the viewport, relative to when the page first started loading. To be fast according to Google, it needs to render before 2.5 seconds and results over 4 seconds is poor performance.

Offenders:

<p></p>

Avoid CPU Long Tasks (longTasks)

The page has 18 CPU long tasks with the total of 2.469 s. The total blocking time is 1.438 s and 2 long tasks before first contentful paint with total time of 231 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:

self

unknown

self

unknown

self

unknown

self

unknown

self

Avoid extra requests by setting cache headers (cacheHeaders)

The page has 6 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 103.4 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/8/8d/President_Barack_Obama..._Barack_Obama.jpg

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

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

https://upload.wikimedia.org/wikipedia/commons/1/18/WP20Symbols_WIKIDATA.svg

https://upload.wikimedia.org/wikipedia/donate/0/08/Wikipedia20_banner_backgroundtop2.svg

https://upload.wikimedia.org/wikipedia/donate/c/c9/Wikipedia20_banner_backgroundbottom2.svg

Long cache headers is good (cacheHeadersLong)

The page has 1 request 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

Make each CSS response small (optimalCssSize)

https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.styles%7Cext.echo.styles.alert%2Cbadge%7Cext.phonos.icons%2Cstyles%7Cext.relatedArticles.styles%7Cext.tmh.player.styles%7Cext.wikimediaBadges%7Cext.wikimediamessages.styles%7Cext.wp25EasterEggs.styles%7Cmediawiki.hlist%7Cmobile.init.styles%7Coojs-ui.styles.icons-alerts%7Cskins.minerva.amc.styles%7Cskins.minerva.codex.styles%7Cskins.minerva.content.styles.images%7Cskins.minerva.icons%2Cstyles%7Cskins.minerva.loggedin.styles%7Cskins.minerva.overflow.icons%7Cwikibase.client.init&only=styles&skin=minerva size is 25.6 kB (25622) 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	25.0 KB	193.1 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 (81)

Title	Advice	Score
Cumulative Layout Shift (cumulativeLayoutShift)	You have a cumulative layout shift score (0.2468) 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-report-only that is 1044 characters long.	99
Description: Do not send response headers that are too long.
Offenders: https://en.wikipedia.org/wiki/Barack_Obama
Avoid unnecessary headers (unnecessaryHeaders)	There are 16 responses that sets both a max-age and expires header. There are 22 responses that sets a server header.	62
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/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/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://en.wikipedia.org/w/load.php...ia.org/w/load.php 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://en.wikipedia.org/w/load.php...ia.org/w/load.php 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://en.wikipedia.org/w/load.php...ia.org/w/load.php 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://en.wikipedia.org/w/load.php...ia.org/w/load.php 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://en.wikipedia.org/w/load.php...ia.org/w/load.php 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://en.wikipedia.org/w/load.php...ia.org/w/load.php 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://en.wikipedia.org/w/load.php...ia.org/w/load.php 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://en.wikipedia.org/w/load.php...ia.org/w/load.php 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://en.wikipedia.org/w/load.php...ia.org/w/load.php https://en.wikipedia.org/w/load.php...ia.org/w/load.php https://en.wikipedia.org/w/load.php?lang=en&modules=oojs-ui-core&skin=minerva&version=1whkk https://en.wikipedia.org/w/load.php?lang=en&modules=oojs-ui-core&skin=minerva&version=1whkk https://meta.wikimedia.org/w/index.php...a.org/w/index.php https://upload.wikimedia.org/wikipedia/commons/1/18/WP20Symbols_WIKIDATA.svg https://upload.wikimedia.org/wikipedia/donate/0/08/Wikipedia20_banner_backgroundtop2.svg https://upload.wikimedia.org/wikipedia/donate/c/c9/Wikipedia20_banner_backgroundbottom2.svg

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 1.46.0-wmf.17
Width	361
Height	6777
DOM elements	14023
Avg DOM depth	14
Max DOM depth	23
Iframes	0
Script tags	8
Local storage	1.3 MB
Session storage	0 b
Network Information API	4g

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

Technologies used to build the page.

Data collected using Wappalyzer version 6.10.54. 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 9.2.11	100	Web servers
HSTS	100	Security

Visual Metrics

Visual Metrics
First Visual Change	3.033 s
Speed Index	3.492 s
Largest Image	3.033 s
Heading	5.967 s
LargestContentfulPaint	5.967 s
Last Meaningful Paint	5.967 s
Largest Contentful Paint	5.967 s
Visual Complete 85%	3.467 s
Visual Complete 95%	5.967 s
Visual Complete 99%	6.067 s
Last Visual Change	6.067 s
Visual Readiness	3.034 s

Browser Metrics

Navigation Timing
backEndTime	2.155 s
domContentLoadedTime	4.034 s
domInteractiveTime	4.034 s
domainLookupTime	0 ms
frontEndTime	1.329 s
pageDownloadTime	571 ms
pageLoadTime	4.055 s
redirectionTime	0 ms
serverConnectionTime	0 ms
serverResponseTime	2.721 s

Google Web Vitals
Time to first byte (TTFB)	2.155 s
First Contentful Paint (FCP)	3.020 s
Largest Contentful Paint (LCP)	3.432 s
Cumulative Layout Shift (CLS)	0.25
Total Blocking Time (TBT)	1.438 s

First Contentful Paint info
Elements that needed recalculate style before FCP	166
Time spent in recalculate style before FCP	83.215 ms

Extra timings
TTFB	2.155 s
First Paint	3.020 s
Load Event End	4.055 s
Fully loaded	5.916 s

User Timing marks
mwStartup	2.475 s
mwCentralNoticeBanner	5.796 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	3.432 s
Element render delay	1.277 s
TTFB	2.155 s
Resource delay	0 ms
Resource load duration	0 ms
Elements that needed recalculate style before LCP	458
Time spent in recalculate style before LCP	134.834 ms
Load time	0 ms
*Size (widthheight)**	76191
DOM path
div#mw-mf-viewport > div#mw-mf-page-center > main#content > div#bodyContent > div#mw-content-text > div:eq(0) > section#mf-section-0 > p:eq(1)> div#mw-mf-viewport > div#mw-mf-page-center > main#content > div#bodyContent > div#mw-content-text > div:eq(0) > section#mf-section-0 > p:eq(1)>

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

0.24675 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
0.24675	<div class="pre-content heading-holder"></div>,<ul id="p-views" class="page-actions-menu__list minerva-icon-only-menu"></ul>,<div id="bodyContent" class="content"></div>,<table class="infobox vcard"></table>
body > div#mw-mf-viewport > div#mw-mf-page-center > main#content > div:eq(1),body > div#mw-mf-viewport > div#mw-mf-page-center > main#content > div:eq(1) > nav > ul#p-views,body > div#mw-mf-viewport > div#mw-mf-page-center > main#content > div#bodyContent,body > div#mw-mf-viewport > div#mw-mf-page-center > main#content > div#bodyContent > div#mw-content-text > div:eq(0) > section#mf-section-0 > table

Score

HTML Element

0.24675

body > div#mw-mf-viewport > div#mw-mf-page-center > main#content > div:eq(1),body > div#mw-mf-viewport > div#mw-mf-page-center > main#content > div:eq(1) > nav > ul#p-views,body > div#mw-mf-viewport > div#mw-mf-page-center > main#content > div#bodyContent,body > div#mw-mf-viewport > div#mw-mf-page-center > main#content > div#bodyContent > div#mw-content-text > div:eq(0) > section#mf-section-0 > table

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
351.3 ms	449.3 ms	3.3 ms	3.3 ms	0 ms
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.page.media&skin=minerva&version=dtg2p
Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 67055
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.page.media&skin=minerva&version=dtg2p
Forced Style And Layout Duration: 1 ms Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 67055
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.page.media&skin=minerva&version=dtg2p
Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 67055
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.page.media&skin=minerva&version=dtg2p
Forced Style And Layout Duration: 12 ms Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 67055

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
272.1 ms	29.9 ms	308.5 ms	299.5 ms	9 ms
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva
Invoker: IdleRequestCallback Invoker Type: user-callback Source Function Name: doPropagation Window attribution: self Source char position: 4314
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva
Forced Style And Layout Duration: 40 ms Invoker: FrameRequestCallback Invoker Type: user-callback Source Function Name: flushCssBuffer Window attribution: self Source char position: 3240

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
254.1 ms	260.2 ms	44 ms	0 ms	44 ms
No availible script information.

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
212.5 ms	274.9 ms	2.6 ms	2.6 ms	0 ms
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.page.media&skin=minerva&version=dtg2p
Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 67055
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.page.media&skin=minerva&version=dtg2p
Forced Style And Layout Duration: 38 ms Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 67055

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
174.5 ms	792.3 ms	1.3 ms	1.3 ms	0 ms
https://en.wikipedia.org/wiki/Barack_Obama
Invoker: https://en.wikipedia.org/wiki/Barack_Obama Invoker Type: classic-script Window attribution: self
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva
Invoker: https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva Invoker Type: classic-script Window attribution: self

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
138.6 ms	128.5 ms	61.5 ms	46.7 ms	14.8 ms
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva
Invoker: IdleRequestCallback Invoker Type: user-callback Source Function Name: doPropagation Window attribution: self Source char position: 4314
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva
Invoker: FrameRequestCallback Invoker Type: user-callback Source Function Name: flushCssBuffer Window attribution: self Source char position: 3240

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
124 ms	107.1 ms	93.3 ms	0 ms	93.3 ms
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva
Invoker: IdleRequestCallback Invoker Type: user-callback Source Function Name: doPropagation Window attribution: self Source char position: 4314

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
85.7 ms	135.7 ms	0 ms	0 ms	0 ms
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva
Invoker: IdleRequestCallback Invoker Type: user-callback Source Function Name: flushWrites Window attribution: self Source char position: 19340

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
73.6 ms	88 ms	64.9 ms	50.4 ms	14.5 ms
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva
Invoker: IdleRequestCallback Invoker Type: user-callback Source Function Name: doPropagation Window attribution: self Source char position: 4314
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.page.media&skin=minerva&version=dtg2p
Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 67055
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva
Invoker: FrameRequestCallback Invoker Type: user-callback Source Function Name: flushCssBuffer Window attribution: self Source char position: 3240

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
32.3 ms	33.8 ms	58.1 ms	0.9 ms	57.2 ms
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.page.media&skin=minerva&version=dtg2p
Invoker: SCRIPT[src="https://meta.wikimedia.org/w/index.php?title=Special:BannerLoader&campaign=IWD2026&banner=IWD2026&uselang=en&debug=false"].onload Invoker Type: event-listener Window attribution: self Source char position: 83222
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.page.media&skin=minerva&version=dtg2p
Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 67055

Server timings

name	duration	description
cache	0	pass
host	0	cp3070

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	42
Frames	42
JSEventListeners	738
LayoutObjects	1287
MediaKeySessions	0
MediaKeys	0
Nodes	33585
Resources	97
ContextLifecycleStateObservers	90
V8PerContextDatas	2
WorkerGlobalScopes	0
UACSSResources	7
RTCPeerConnections	0
ResourceFetchers	42
AdSubframes	0
DetachedScriptStates	0
ArrayBufferContents	0
LayoutCount	22
RecalcStyleCount	33
LayoutDuration	197
RecalcStyleDuration	412
DevToolsCommandDuration	566
ScriptDuration	1901
V8CompileDuration	13
TaskDuration	4789
TaskOtherDuration	1700
ThreadTime	15
ProcessTime	59
JSHeapUsedSize	14126032
JSHeapTotalSize	15441920
FirstMeaningfulPaint	3432

Visual Elements

Name	Display Time	X	Y	Width	Height
LargestImage (wikipedia-wordmark-en-25.svg)	3.033 s	53	16	140	22
<img src="/static/images/mobile/copyright/wikipedia-wordmark-en-25.svg" alt="Wikipedia" width="140" height="22" style="width: 8.75em; height: 1.375em;">
Heading	5.967 s	16	262	328	37
<h1 id="firstHeading" class="firstHeading mw-first-heading"></h1>
LargestContentfulPaint	5.967 s	16	473	328	246
<p></p>

PageXray

How the page is built.

Summary
HTTP version	HTTP/2.0
Total requests	22
Total domains	3
Total transfer size	464.5 KB
Total content size	2.0 MB
Responses missing compression	8
Number of cookies	2
Third party cookies	0

Requests per response code
200	22

Largest assets on the page (by transfer size)

URL	Type	Transfer Size	Content Size
https://en.wikipedia...wiki/Barack_Obama	html	239.8 KB	1.3 MB
https://upload.wikim..._Barack_Obama.jpg	image	69.9 KB	69.0 KB
https://en.wikipedia...ia.org/w/load.php	javascript	47.0 KB	162.5 KB
https://en.wikipedia...ia.org/w/load.php	javascript	38.2 KB	186.0 KB
https://en.wikipedia...ia.org/w/load.php	css	25.0 KB	193.1 KB
https://upload.wikim...bols_WIKIDATA.svg	svg	15.1 KB	36.3 KB
https://upload.wikim...signature.svg.png	image	4.2 KB	3.3 KB
https://upload.wikim...ackgroundtop2.svg	svg	4.1 KB	8.8 KB
https://meta.wikimed...a.org/w/index.php	javascript	4.0 KB	10.2 KB
https://upload.wikim...groundbottom2.svg	svg	3.6 KB	7.5 KB
https://en.wikipedia...ia.org/w/load.php	svg	1.3 KB	707 B
https://en.wikipedia...ia.org/w/load.php	svg	1.2 KB	556 B
https://en.wikipedia...ia.org/w/load.php	svg	1.1 KB	414 B
https://en.wikipedia...ia.org/w/load.php	svg	1.1 KB	318 B
https://en.wikipedia...ia.org/w/load.php	svg	1.1 KB	440 B
https://en.wikipedia...ia.org/w/load.php	svg	1.1 KB	326 B
https://en.wikipedia...ia.org/w/load.php	svg	1.1 KB	327 B
https://en.wikipedia...ia.org/w/load.php	svg	1.1 KB	319 B
https://en.wikipedia...ia.org/w/load.php	svg	1.1 KB	310 B
https://en.wikipedia...ia.org/w/load.php	svg	1.1 KB	286 B

Requests and sizes per content type

Content	Transfer Size	Content Size	Requests
html	239.8 KB	1.3 MB	1
css	25.0 KB	193.1 KB	1
javascript	89.2 KB	358.7 KB	3
image	74.2 KB	72.3 KB	2
svg	36.3 KB	57.1 KB	15
Total	464.5 KB	2.0 MB	22

Data per domain

Domain	Total download time	Transfer Size	Content Size	Requests
en.wikipedia.org	4.743 s	363.6 KB	1.8 MB	16
upload.wikimedia.org	715 ms	97.0 KB	124.9 KB	5
meta.wikimedia.org	104 ms	4.0 KB	10.2 KB	1

Expires and last modified statistics

type	min	median	max
Expires	0 seconds	4 weeks	4 weeks
Last modified	42 seconds	3 years	5 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=ext.eventLogging.metricsPlatform&skin=minerva&version=1i3oh 4:217 "The stream mediawiki.web_ui_actions is out of sample. No event will be sent"
INFO	https://en.wikipedia.org/w/load.php?lang=en&modules=mobile.init&skin=minerva&version=1g0ac 0:14087 "Hello friend! 🍦\n\nWikipedia is powered by MediaWiki. MediaWiki is open source software and we're always keen to hear from fellow developers about what you love (😍) or what we could be doing better (😱).\n\n💪 Or work for us @ https://wikimediafoundation.org/about/jobs/"
WARNING	https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva 11:149 "This page is using the deprecated ResourceLoader module \"moment\".\n[1.44] Use mediawiki.DateFormatter or native Intl function instead. See https://phabricator.wikimedia.org/T146798"

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	42.2 KB	2
image	0 b	0
font	0 b	0
svg	22.8 KB	3
Total	65.0 KB	5

Requests loaded after onContentLoad

Includes requests done after DOM content loaded.

Content	Transfer Size	Requests
html	0 b	0
css	0 b	0
javascript	42.2 KB	2
image	0 b	0
font	0 b	0
svg	22.8 KB	3
Total	65.0 KB	5

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		1438
Max Potential First Input Delay		398
Long Tasks before First Paint	2	231
Long Tasks before First Contentful Paint	2	231
Long Tasks before Largest Contentful Paint	4	413
Long Tasks after Load Event End	11	1628
Total Long Tasks	18	2469

CPU last long task happened at 6.365 s

Individual Long Tasks

name	startTime	duration	containerType
self	2473	84	window
unknown	2863	147	window
self	3224	80	window
unknown	3305	102	window
unknown	3447	77	window
self	3673	260	window
unknown	3933	91	window
self	4280	127	window
self	4407	67	window
self	4523	398	window
self	4939	58	window
self	5027	75	window
self	5132	321	window
self	5467	259	window
unknown	5801	79	window
self	6033	137	window
self	6282	53	window
self	6365	54	window

CPU time spent

Calculated using Tracium.

Categories (ms)
parseHTML	396
styleLayout	639
paintCompositeRender	99
scriptParseCompile	12
scriptEvaluation	1911
garbageCollection	182
other	1646

Events (ms)
FunctionCall	1714
RunTask	746
CpuProfiler::StartProfiling	517
UpdateLayoutTree	416
ParseHTML	365
Layout	206
DecodedDataDocumentParser::AppendBytes	108
DocumentLoader::BodyLoadingFinished	100
v8.run	69
Paint	59
V8.GC_HEAP_EMBEDDER_TRACING_EPILOGUE	50
V8.HandleInterrupts	46
PrePaint	35
PaintImage	27
DocumentLoader::CommitNavigation	26
v8.produceCache	19
V8.GC_MC_INCREMENTAL	18
Layerize	18
V8.GC_MARK_COMPACTOR	15
ParseAuthorStyleSheet	15
HTMLDocumentParser::MaybeFetchQueuedPreloads	15
V8.GC_MC_EVACUATE_COPY_PARALLEL	14
V8.GC_MC_INCREMENTAL_EMBEDDER_TRACING	13
V8.BytecodeBudgetInterrupt	12
EventDispatch	12
DocumentLoader::BodyDataReceivedImpl	12
v8.compile	12
DocumentLoader::FinishedLoading	11

Time spent per request

URL	CPU time (ms)
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva	1945
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.page.media&skin=minerva&version=dtg2p	834
https://meta.wikimedia.org/w/index.php?title=Special:BannerLoader&campaign=IWD2026&banner=IWD2026&uselang=en&debug=false	46
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.centralNotice.display&skin=minerva&version=14cwo	26
https://en.wikipedia.org/wiki/Barack_Obama	17

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

Screenshots

afterPageCompleteCheck.jpg

layoutShift.jpg

largestContentfulPaint.jpg

Run 1 summary

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

Summary

Waterfall

Video

Filmstrip

Coach

Coach score

Performance advice (79)

Best practice advice (81)

Privacy advice (88)

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

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

CPU

Long Tasks

Individual Long Tasks

CPU time spent

Time spent per request

Screenshots