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

Summary

Metric	Value
Page metrics
Performance score	76
Total page size	596.1 KB
Requests	41
Timing metrics
TTFB	125 ms
First Paint	416 ms
Fully Loaded	9.245 s
Google Web Vitals
TTFB	125 ms
First Contentful Paint (FCP)	416 ms
Largest Contentful Paint (LCP)	416 ms
Cumulative Layout Shift (CLS)	0.16
280 ms
Total Blocking Time	124 ms
Max Potential FID	174 ms
CPU metrics
CPU long tasks	2
CPU last long task happens at	1.038 s
Visual Metrics
First Visual Change	433 ms
Speed Index	1.458 s
Visual Complete 85%	500 ms
Visual Complete 99%	12.966 s
Last Visual Change	12.966 s

Download video Download timeline Download Console Logs

| Waterfall | | Download HAR |

Waterfall

Download HAR Compare

| Video | Download |

Video

Download video

| Filmstrip |

Filmstrip

Use--filmstrip.showAll to show all filmstrips.

0 s

0.3 sCPU Long Task duration 55 ms

0.4 smwStartup 375 msDOM Content Loaded Time 389 ms

0.5 sFirst Contentful Paint 416 msLCP <P> 416 msFirst Visual Change 433 msVisual Complete 85% 500 ms

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1 smwCentralNoticeBanner 987 ms

1.1 sPage Load Time 1.037 sCPU Long Task duration 174 ms

1.2 s

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8.8 sLayout Shift 0.00177 8.718 sLayout Shift 0.00229 8.764 sLayout Shift 0.00134 8.786 s

8.9 sLayout Shift 0.00150 8.807 sLayout Shift 0.00167 8.814 sLayout Shift 0.00187 8.836 sLayout Shift 0.00222 8.856 sLayout Shift 0.00497 8.884 s

9 sLayout Shift 0.00312 8.906 sLayout Shift 0.00726 8.930 sLayout Shift 0.00448 8.953 sLayout Shift 0.00539 8.973 sLayout Shift 0.01281 8.997 s

9.1 sLayout Shift 0.00778 9.024 sLayout Shift 0.01745 9.047 sLayout Shift 0.00870 9.069 sLayout Shift 0.01525 9.096 s

9.2 sLayout Shift 0.00646 9.117 sLayout Shift 0.00559 9.137 sLayout Shift 0.00931 9.161 sLayout Shift 0.00419 9.183 s

9.3 sLayout Shift 0.00349 9.205 sLayout Shift 0.00607 9.226 sFully Loaded 9.245 sLayout Shift 0.00280 9.247 sLayout Shift 0.00235 9.266 sLayout Shift 0.00214 9.287 s

9.4 sLayout Shift 0.00196 9.305 sLayout Shift 0.00375 9.332 sLayout Shift 0.00152 9.353 sLayout Shift 0.00055 9.372 sLayout Shift 0.00248 9.399 s

9.5 sLayout Shift 0.00235 9.446 sLayout Shift 0.00189 9.496 s

9.6 sLayout Shift 0.00162 9.561 s

9.7 s

9.8 sLargest Image 9.733 sHeading 9.733 sVisual Complete 95% 9.766 s

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13 sLast Visual Change 12.966 sVisual Complete 99% 12.966 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 81
Performance score 76
Privacy score 88
Best practice score 81

Performance advice (76)

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.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.org/w/load.php...ia.org/w/load.php

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 2 CPU long tasks with the total of 229 ms. The total blocking time is 124 ms and 1 long task before first contentful paint with total time of 55 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

Avoid doing redirects (assetsRedirects)

The page has 1 redirect. 1 of the redirects are from the base domain, please fix them!

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.org/wiki/Special:CentralAutoLogin/start?type=script

Avoid extra requests by setting cache headers (cacheHeaders)

The page has 21 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 194.8 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/a/ad/Foxborostade_crop_1.pn...ostade_crop_1.png

https://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Song_Zhenzhong.jpeg/12...ng_Zhenzhong.jpeg

https://upload.wikimedia.org/wikipedia/commons/thumb/a/af/Hong_Kong_47_arrestees..._47_arrestees.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/f/f3/Alan_Freed_disk_jockey...d_disk_jockey.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/a/ac/Red-lored_Whistler_0A2...tler_0A2A8896.jpg

https://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/31px-Commons-logo.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/a/a6/MediaWiki-2020-icon.sv...2020-icon.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/7/75/Wikimedia_Community_Lo...nity_Logo.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikibooks-logo.svg/35p...ooks-logo.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Wikidata-logo.svg/47px...data-logo.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/2/24/Wikinews-logo.svg/51px...news-logo.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikiquote-logo.svg/35p...uote-logo.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/35...urce-logo.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/d/df/Wikispecies-logo.svg/3...cies-logo.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/0/0b/Wikiversity_logo_2017....logo_2017.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Wikivoyage-Logo-v3-ico...o-v3-icon.svg.png

https://upload.wikimedia.org/wikipedia/en/thumb/0/06/Wiktionary-logo-v2.svg/35px...y-logo-v2.svg.png

https://upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Wiktionary-logo.svg/41...nary-logo.svg.png

https://en.wikipedia.org/wiki/Special:CentralAutoLogin/start?type=script

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

https://login.wikimedia.org/wiki/Special:CentralAutoLogin/checkLoggedIn?wikiid=enwiki&type=script

Long cache headers is good (cacheHeadersLong)

The page has 4 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/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022

https://en.wikipedia.org/w/load.php?lang=en&modules=site.styles&only=styles&skin=vector-2022

https://en.wikipedia.org/api/rest_v1/page/summary/Hong_Kong_47

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

The total JavaScript transfer size is 413.2 kB and the uncompressed size is 1.6 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.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022	20.4 KB	61.5 KB
https://en.wikipedia.org/w/load.php...ia.org/w/load.php	7.7 KB	22.3 KB
https://en.wikipedia.org/w/load.php...ia.org/w/load.php	17.1 KB	58.1 KB
https://en.wikipedia.org/w/load.php...ia.org/w/load.php	171.3 KB	675.7 KB
https://en.wikipedia.org/w/load.php...ia.org/w/load.php	26.9 KB	129.0 KB
https://en.wikipedia.org/w/load.php...ia.org/w/load.php	2.7 KB	14.8 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...ia.org/w/load.php	74.1 KB	236.0 KB
https://login.wikimedia.org/wiki/Special:CentralAutoLogin/checkLoggedIn?wikiid=enwiki&type=script	1.2 KB	252 B

Make each CSS response small (optimalCssSize)

https://en.wikipedia.org/w/load.php?lang=en&modules=ext.uls.interlanguage%7Cext.visualEditor.desktopArticleTarget.noscript%7Cext.wikimediaBadges%7Cext.wikimediamessages.styles%7Cskins.vector.icons%2Cstyles%7Cskins.vector.search.codex.styles&only=styles&skin=vector-2022 size is 21.9 kB (21887) 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	21.4 KB	170.5 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.org/wiki/Main_Page

https://en.wikipedia.org/wiki/Special:CentralAutoLogin/start?type=script

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

https://login.wikimedia.org/wiki/Special:CentralAutoLogin/checkLoggedIn?wikiid=enwiki&type=script

Best practice advice (81)

Title	Advice	Score
Cumulative Layout Shift (cumulativeLayoutShift)	You have a cumulative layout shift score (0.1584) 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...ia.org/w/load.php has a header sourcemap that is 972 characters long.	99
Description: Do not send response headers that are too long.
Offenders: https://en.wikipedia.org/w/load.php...ia.org/w/load.php
Avoid unnecessary headers (unnecessaryHeaders)	There are 17 responses that sets both a max-age and expires header. There are 41 responses that sets a server header.	42
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/Main_Page 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=startup&only=scripts&raw=1&skin=vector-2022 https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022 https://en.wikipedia.org/w/load.php?lang=en&modules=site.styles&only=styles&skin=vector-2022 https://en.wikipedia.org/w/load.php?lang=en&modules=site.styles&only=styles&skin=vector-2022 https://en.wikipedia.org/static/images/mobile/copyright/wikipedia-wordmark-en.svg https://en.wikipedia.org/static/images/mobile/copyright/wikipedia-wordmark-en.svg https://upload.wikimedia.org/wikipedia/commons/thumb/a/ad/Foxborostade_crop_1.pn...ostade_crop_1.png https://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Song_Zhenzhong.jpeg/12...ng_Zhenzhong.jpeg https://en.wikipedia.org/static/images/icons/wikipedia.png https://en.wikipedia.org/static/images/icons/wikipedia.png https://upload.wikimedia.org/wikipedia/commons/thumb/a/af/Hong_Kong_47_arrestees..._47_arrestees.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/f/f3/Alan_Freed_disk_jockey...d_disk_jockey.jpg https://en.wikipedia.org/static/images/mobile/copyright/wikipedia-tagline-en.svg https://en.wikipedia.org/static/images/mobile/copyright/wikipedia-tagline-en.svg https://upload.wikimedia.org/wikipedia/commons/thumb/a/ac/Red-lored_Whistler_0A2...tler_0A2A8896.jpg https://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/31px-Commons-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/a/a6/MediaWiki-2020-icon.sv...2020-icon.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/7/75/Wikimedia_Community_Lo...nity_Logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikibooks-logo.svg/35p...ooks-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Wikidata-logo.svg/47px...data-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/2/24/Wikinews-logo.svg/51px...news-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikiquote-logo.svg/35p...uote-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/35...urce-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/d/df/Wikispecies-logo.svg/3...cies-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/0/0b/Wikiversity_logo_2017....logo_2017.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Wikivoyage-Logo-v3-ico...o-v3-icon.svg.png https://upload.wikimedia.org/wikipedia/en/thumb/0/06/Wiktionary-logo-v2.svg/35px...y-logo-v2.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Wiktionary-logo.svg/41...nary-logo.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/static/images/project-logos/enwiki.png https://en.wikipedia.org/static/images/project-logos/enwiki.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/wiki/Special:CentralAutoLogin/start?type=script https://meta.wikimedia.org/w/index.php...a.org/w/index.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://login.wikimedia.org/wiki/Special:CentralAutoLogin/checkLoggedIn?wikiid=enwiki&type=script https://en.wikipedia.org/beacon/impression...beacon/impression https://en.wikipedia.org/static/favicon/wikipedia.ico https://en.wikipedia.org/static/favicon/wikipedia.ico https://en.wikipedia.org/api/rest_v1/page/summary/Hong_Kong_47

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/Main_Page
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/Main_Page

Page info

Page info
Title	Wikipedia, the free encyclopedia
Generator	MediaWiki 1.44.0-wmf.3
Width	1904
Height	3678
DOM elements	1764
Avg DOM depth	14
Max DOM depth	24
Iframes	0
Script tags	6
Local storage	891.0 KB
Session storage	0 b
Network Information API	4g

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
HSTS	100	Security

Visual Metrics

Visual Metrics
First Visual Change	433 ms
Speed Index	1.458 s
Largest Image	9.733 s
Heading	9.733 s
LargestContentfulPaint	9.733 s
Last Meaningful Paint	9.733 s
Largest Contentful Paint	9.733 s
Visual Complete 85%	500 ms
Visual Complete 95%	9.766 s
Visual Complete 99%	12.966 s
Last Visual Change	12.966 s
Visual Readiness	12.533 s

Browser Metrics

Navigation Timing
backEndTime	125 ms
domContentLoadedTime	389 ms
domInteractiveTime	389 ms
domainLookupTime	0 ms
frontEndTime	900 ms
pageDownloadTime	12 ms
pageLoadTime	1.037 s
redirectionTime	0 ms
serverConnectionTime	0 ms
serverResponseTime	131 ms

Google Web Vitals
Time to first byte (TTFB)	125 ms
First Contentful Paint (FCP)	416 ms
Largest Contentful Paint (LCP)	416 ms
Cumulative Layout Shift (CLS)	0.16
Interaction to next paint (INP)	280 ms
Total Blocking Time (TBT)	124 ms

First Contentful Paint info
Elements that needed recalculate style before FCP	1274
Time spent in recalculate style before FCP	23.669 ms

Extra timings
TTFB	125 ms
First Paint	416 ms
Load Event End	1.037 s
Fully loaded	9.245 s

User Timing marks
mwStartup	375 ms
mwCentralNoticeBanner	987 ms

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	416 ms
Elements that needed recalculate style before LCP	1274
Time spent in recalculate style before LCP	23.669 ms
Load time	0 ms
*Size (widthheight)**	225105
DOM path
div:eq(2) > div > div:eq(2) > main#content > div#bodyContent > div#mw-content-text > div:eq(0) > div#mp-upper > div#mp-left > div#mp-tfa > p> div:eq(2) > div > div:eq(2) > main#content > div#bodyContent > div#mw-content-text > div:eq(0) > div#mp-upper > div#mp-left > div#mp-tfa > p>

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

0.15839 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
0.01745	<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)
0.01281	<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)
0.00778	<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)
0.00726	<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)
0.00646	<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)
0.00607	<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)
0.00559	<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)
0.00497	<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)
0.00448	<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)
0.00375	<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)
0.00349	<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)
0.00312	<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)
0.00248	<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)
0.00235	<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)
0.00229	<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)
0.00222	<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)
0.00214	<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)
0.00196	<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)
0.00189	<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)
0.00187	<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)
0.00177	<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)
0.00167	<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)
0.00162	<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)
0.00150	<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)
0.00134	<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)
0.00055	<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 280 ms.

Event type	pointerover
Element type	A
Element class name
Event target	#mp-itn>ul>li>a
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
133 ms	174.1 ms	8.9 ms	4.3 ms	4.6 ms
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022
Forced Style And Layout Duration: 76 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

133 ms

174.1 ms

8.9 ms

4.3 ms

4.6 ms

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

Forced Style And Layout Duration: 76 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
4 ms	187.3 ms	5.7 ms	0.1 ms	5.6 ms
No availible script information.

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
0 ms	42.2 ms	12.8 ms	9.4 ms	3.4 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

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	12
Frames	11
JSEventListeners	167
LayoutObjects	2770
MediaKeySessions	0
MediaKeys	0
Nodes	6343
Resources	47
ContextLifecycleStateObservers	15
V8PerContextDatas	2
WorkerGlobalScopes	0
UACSSResources	0
RTCPeerConnections	0
ResourceFetchers	12
AdSubframes	0
DetachedScriptStates	0
ArrayBufferContents	4
LayoutCount	230
RecalcStyleCount	254
LayoutDuration	108
RecalcStyleDuration	141
DevToolsCommandDuration	25
ScriptDuration	282
V8CompileDuration	10
TaskDuration	1209
TaskOtherDuration	642
ThreadTime	2
ProcessTime	6
JSHeapUsedSize	9434276
JSHeapTotalSize	14237696
FirstMeaningfulPaint	416

Visual Elements

Name	Display Time	X	Y	Width	Height
LargestImage (160px-Foxborostade_crop_1.png)	9.733 s	215	682	160	122
<img alt="Foxboro Stadium, host venue of MLS Cup 1999" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ad/Foxborostade_crop_1.png/160px-Foxborostade_crop_1.png" decoding="async" width="160" height="122" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ad/Foxborostade_crop_1.png/240px-Foxborostade_crop_1.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ad/Foxborostade_crop_1.png/320px-Foxborostade_crop_1.png 2x" data-file-width="625" data-file-height="477">
Heading	9.733 s	684	514	256	28
<h1 id="Welcome_to_Wikipedia"></h1>
LargestContentfulPaint	9.733 s	215	674	649	358
<p></p>

PageXray

How the page is built.

Summary
HTTP version	HTTP/2.0
Total requests	41
Total domains	4
Total transfer size	596.1 KB
Total content size	1.9 MB
Responses missing compression	13
Number of cookies	2
Third party cookies	0

Requests per response code
200	39
204	1
302	1

Largest assets on the page (by transfer size)

URL	Type	Transfer Size	Content Size
https://en.wikipedia...ia.org/w/load.php	javascript	171.3 KB	675.7 KB
https://meta.wikimed...a.org/w/index.php	javascript	82.2 KB	321.4 KB
https://en.wikipedia...ia.org/w/load.php	javascript	74.1 KB	236.0 KB
https://upload.wikim...ostade_crop_1.png	image	35.4 KB	34.5 KB
https://en.wikipedia...ia.org/w/load.php	javascript	26.9 KB	129.0 KB
https://en.wikipedia.org/wiki/Main_Page	html	24.4 KB	109.0 KB
https://en.wikipedia...ia.org/w/load.php	css	21.4 KB	170.5 KB
https://en.wikipedia...ia.org/w/load.php	javascript	20.4 KB	61.5 KB
https://en.wikipedia...ia.org/w/load.php	javascript	17.1 KB	58.1 KB
https://upload.wikim...tler_0A2A8896.jpg	image	16.6 KB	15.7 KB
https://en.wikipedia...ons/wikipedia.png	image	13.8 KB	13.1 KB
https://upload.wikim..._47_arrestees.jpg	image	10.8 KB	9.9 KB
https://en.wikipedia...-logos/enwiki.png	image	8.5 KB	7.8 KB
https://en.wikipedia...ia.org/w/load.php	javascript	7.7 KB	22.3 KB
https://upload.wikim...d_disk_jockey.jpg	image	7.4 KB	6.6 KB
https://upload.wikim...ng_Zhenzhong.jpeg	image	6.7 KB	5.8 KB
https://upload.wikim...nary-logo.svg.png	image	4.1 KB	3.3 KB
https://en.wikipedia...ia-tagline-en.svg	svg	3.9 KB	9.2 KB
https://en.wikipedia...a-wordmark-en.svg	svg	3.3 KB	6.0 KB
https://upload.wikim...news-logo.svg.png	image	3.3 KB	2.4 KB

Requests and sizes per content type

Content	Transfer Size	Content Size	Requests
html	24.4 KB	109.0 KB	1
css	24.4 KB	177.7 KB	2
javascript	403.5 KB	1.5 MB	9
image	129.1 KB	112.2 KB	20
svg	10.4 KB	16.4 KB	5
plain	546 B	0 b	1
favicon	1.7 KB	2.7 KB	1
json	2.1 KB	1.7 KB	1
Total	596.1 KB	1.9 MB	40

Data per domain

Domain	Total download time	Transfer Size	Content Size	Requests
en.wikipedia.org	2.909 s	405.9 KB	1.5 MB	21
upload.wikimedia.org	9.780 s	106.8 KB	91.3 KB	18
meta.wikimedia.org	176 ms	82.2 KB	321.4 KB	1
login.wikimedia.org	165 ms	1.2 KB	252 B	1

Expires and last modified statistics

type	min	median	max
Expires	0 seconds	0 seconds	1 year
Last modified	2 seconds	21 weeks	3 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.

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
favicon	1.7 KB	1
json	2.1 KB	1
Total	3.8 KB	2

Requests loaded after onContentLoad

Includes requests done after DOM content loaded.

Content	Transfer Size	Requests
html	0 b	0
css	0 b	0
javascript	187.0 KB	5
image	8.5 KB	1
font	0 b	0
plain	546 B	1
favicon	1.7 KB	1
json	2.1 KB	1
Total	199.8 KB	10

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...ia.org/w/load.php	non_blocking
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
https://en.wikipedia...ia.org/w/load.php	potentially_blocking
https://en.wikipedia...ia.org/w/load.php	non_blocking
https://en.wikipedia...-logos/enwiki.png	non_blocking
https://en.wikipedia...ia.org/w/load.php	non_blocking
https://en.wikipedia...ia.org/w/load.php	blocking
https://en.wikipedia...ia.org/w/load.php	non_blocking
https://login.wikime...gin/checkLoggedIn	non_blocking
https://en.wikipedia...alAutoLogin/start	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		124
Max Potential First Input Delay		174
Long Tasks before First Paint	1	55
Long Tasks before First Contentful Paint	1	55
Long Tasks before Largest Contentful Paint	1	55
Long Tasks after Load Event End	1	174
Total Long Tasks	2	229

CPU last long task happened at 1.038 s

Individual Long Tasks

name	startTime	duration	containerId	containerName	containerSrc	containerType
unknown	276	55				window
self	1038	174				window

CPU time spent

Calculated using Tracium.

Categories (ms)
parseHTML	26
styleLayout	249
paintCompositeRender	200
scriptParseCompile	10
scriptEvaluation	281
garbageCollection	10
other	440

Events (ms)
FunctionCall	234
RunTask	161
UpdateLayoutTree	143
Paint	136
Layout	105
PrePaint	94
Layerize	90
Commit	56
HitTest	30
PaintImage	25
ParseHTML	22
CpuProfiler::StartProfiling	19
v8.run	16
RunMicrotasks	15
v8.compile	10

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	297
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.centralNotice.bannerHistoryLogger%2CchoiceData%2Cdisplay%2CgeoIP%2CimpressionDiet%2CkvStore%2ClargeBannerLimit%2ClegacySupport%2CstartUp%7Cext.centralauth.centralautologin%7Cext.checkUser.clientHints%7Cext.cx.eventlogging.campaigns%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.growthExperiments.SuggestedEditSession%7Cext.uls.interface%2Cpreferences%2Cwebfonts%7Cext.urlShortener.toolbar%7Cjquery%2Coojs%2Csite%7Cjquery.client%2CtextSelection%7Cmediawiki.String%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.editfont.styles%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax%7Cmmv.bootstrap%2Ccodex%7Cskins.vector.clientPreferences%2Cjs%7Cskins.vector.icons.js%7Cwikibase.client.vector-2022%7Cwikibase.sidebar.tracking&skin=vector-2022&version=nddfv	60
https://meta.wikimedia.org/w/index.php?title=Special:BannerLoader&campaign=C24_WMDE_Desktop_EN_04&banner=B24_WMDE_Desktop_EN_04_ctrl&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/Main_Page

Summary

Waterfall

Video

Filmstrip

Coach

Coach score

Performance advice (76)

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

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