Run 2 for https://en.m.wikipedia.org/wiki/Barack

Summary

Metric	Value
Page metrics
Performance score	87
Total page size	373.5 KB
Requests	13
Timing metrics
TTFB	120 ms
First Paint	848 ms
Fully Loaded	3.896 s
Google Web Vitals
TTFB	120 ms
First Contentful Paint (FCP)	848 ms
Largest Contentful Paint (LCP)	1.148 s
Cumulative Layout Shift (CLS)	0.29
Total Blocking Time	1.012 s
Max Potential FID	384 ms
CPU metrics
CPU long tasks	15
CPU last long task happens at	4.489 s
Visual Metrics
First Visual Change	833 ms
Speed Index	3.194 s
Visual Complete 85%	4.466 s
Visual Complete 99%	12.833 s
Last Visual Change	13.500 s

Download video Download timeline Download Console Logs

| Waterfall | | Download HAR |

Waterfall

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| Video | Download |

Video

Download video

| Filmstrip |

Filmstrip

Use--filmstrip.showAll to show all filmstrips.

0 s

0.3 sCPU Long Task duration 63 msmwStartup 273 ms

0.8 sCPU Long Task duration 95 ms

0.9 sFirst Visual Change 833 msLargest Image 833 msFirst Contentful Paint 848 ms

1 s

1.1 sCPU Long Task duration 68 ms

1.2 sCPU Long Task duration 62 msLCP <P> 1.148 s

1.3 sCPU Long Task duration 70 ms

1.4 sCPU Long Task duration 82 ms

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2.6 sCPU Long Task duration 117 ms

2.7 sCPU Long Task duration 54 ms

2.8 sDOM Content Loaded Time 2.757 sPage Load Time 2.775 s

3 sCPU Long Task duration 112 ms

3.1 s

3.3 sCPU Long Task duration 384 ms

3.7 sCPU Long Task duration 63 msCPU Long Task duration 92 ms

3.9 sCPU Long Task duration 272 msFully Loaded 3.896 s

4.1 s

4.2 sCPU Long Task duration 188 ms

4.3 s

4.4 smwCentralNoticeBanner 4.382 s

4.5 sLayout Shift 0.29473 4.423 sHeading 4.433 sVisual Complete 85% 4.466 sCPU Long Task duration 98 ms

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12.8 sVisual Complete 95% 12.766 s

12.9 sVisual Complete 99% 12.833 s

13 s

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13.5 sLast Visual Change 13.500 s

Coach

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

Coach score

Total score 85
Performance score 87
Privacy score 88
Best practice score 74

Performance advice (87)

Title

Advice

Score

Avoid slowing down the critical rendering path (avoidRenderBlocking)

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

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.m.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.m.wikipedia.org/static/images/mobile/copyright/wikipedia-wordmark-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 15 CPU long tasks with the total of 1.820 s. The total blocking time is 1.012 s and 2 long tasks before first contentful paint with total time of 158 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

Avoid doing redirects (assetsRedirects)

The page has 1 redirect. 1 request are from other domains, it could be 3rd-party assets doing unnecessary redirects. :(

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

Offenders:

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

Avoid extra requests by setting cache headers (cacheHeaders)

The page has 4 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 50 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://meta.m.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.m.wikipedia.org/w/load.php...ia.org/w/load.php

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

Always compress text content (compressAssets)

The page has 1 request that are served uncompressed. You could save a lot of bytes by sending them compressed instead.

Description: In the early days of the Internet there were browsers that didn't support compressing (gzipping) text content. They do now. Make sure you compress HTML, JSON, JavaScript, CSS and SVG. It will save bytes for the user; making the page load faster and use less bandwith.

Offenders:

URL	Transfer size	Content size
https://meta.m.wikimedia.org/w/index.php...a.org/w/index.php	2.3 KB	4.8 KB

Make each CSS response small (optimalCssSize)

https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.cite.styles%7Cext.phonos.icons%2Cstyles%7Cext.relatedArticles.styles%7Cext.tmh.player.styles%7Cext.wikimediaBadges%7Cext.wikimediamessages.styles%7Cmediawiki.hlist%7Cmobile.init.styles%7Cskins.minerva.amc.styles%7Cskins.minerva.codex.styles%7Cskins.minerva.content.styles.images%7Cskins.minerva.icons%2Cstyles%7Cwikibase.client.init&only=styles&skin=minerva size is 18.2 kB (18216) 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.m.wikipedia.org/w/load.php...ia.org/w/load.php	17.8 KB	125.3 KB

Best practice advice (74)

Title	Advice	Score
Cumulative Layout Shift (cumulativeLayoutShift)	You have a poor cumulative layout shift score (0.2947). It is in the Google Web Vitals poor range, with a shift higher than 0.25. You should manually check the filmstrip or video and check if it will affect the user.	0
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 8 responses that sets both a max-age and expires header. There are 13 responses that sets a server header.	79
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.m.wikipedia.org/wiki/Barack_Obama https://en.m.wikipedia.org/w/load.php...ia.org/w/load.php https://en.m.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.m.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva https://en.m.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva https://en.m.wikipedia.org/w/load.php...ia.org/w/load.php https://en.m.wikipedia.org/w/load.php...ia.org/w/load.php https://en.m.wikipedia.org/w/load.php...ia.org/w/load.php https://en.m.wikipedia.org/w/load.php...ia.org/w/load.php https://en.m.wikipedia.org/w/load.php...ia.org/w/load.php https://en.m.wikipedia.org/w/load.php...ia.org/w/load.php https://en.m.wikipedia.org/w/load.php...ia.org/w/load.php https://en.m.wikipedia.org/w/load.php...ia.org/w/load.php https://en.m.wikipedia.org/w/load.php...ia.org/w/load.php https://en.m.wikipedia.org/w/load.php...ia.org/w/load.php https://en.m.wikipedia.org/w/load.php...ia.org/w/load.php https://en.m.wikipedia.org/w/load.php...ia.org/w/load.php https://meta.wikimedia.org/w/index.php...a.org/w/index.php https://meta.m.wikimedia.org/w/index.php...a.org/w/index.php

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.m.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.m.wikipedia.org/wiki/Barack_Obama

Page info

Page info
Title	Barack Obama - Wikipedia
Generator	MediaWiki 1.44.0-wmf.16
Width	360
Height	6808
DOM elements	13713
Avg DOM depth	14
Max DOM depth	23
Iframes	0
Script tags	7
Local storage	787.2 KB
Session storage	0 b
Network Information API	4g

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

Technologies used to build the page.

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

Technology	Confidence	Category
MediaWiki	100	Wikis
PHP	100	Programming languages
HSTS	100	Security

Visual Metrics

Visual Metrics
First Visual Change	833 ms
Speed Index	3.194 s
Largest Image	833 ms
Heading	4.433 s
Last Meaningful Paint	4.433 s
Visual Complete 85%	4.466 s
Visual Complete 95%	12.766 s
Visual Complete 99%	12.833 s
Last Visual Change	13.500 s
Visual Readiness	12.667 s

Browser Metrics

Navigation Timing
backEndTime	120 ms
domContentLoadedTime	2.757 s
domInteractiveTime	2.757 s
domainLookupTime	0 ms
frontEndTime	2.451 s
pageDownloadTime	204 ms
pageLoadTime	2.775 s
redirectionTime	0 ms
serverConnectionTime	0 ms
serverResponseTime	318 ms

Google Web Vitals
Time to first byte (TTFB)	120 ms
First Contentful Paint (FCP)	848 ms
Largest Contentful Paint (LCP)	1.148 s
Cumulative Layout Shift (CLS)	0.29
Total Blocking Time (TBT)	1.012 s

First Contentful Paint info
Elements that needed recalculate style before FCP	101
Time spent in recalculate style before FCP	49.269 ms

Extra timings
TTFB	120 ms
First Paint	848 ms
Load Event End	2.776 s
Fully loaded	3.896 s

User Timing marks
mwStartup	273 ms
mwCentralNoticeBanner	4.382 s

Largest Contentful Paint

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

Element type	P
Element/tag	<p></p>
Render time	1.148 s
Element render delay	1.028 s
TTFB	120 ms
Resource delay	0 ms
Resource load duration	0 ms
Elements that needed recalculate style before LCP	244
Time spent in recalculate style before LCP	66.766 ms
Load time	0 ms
*Size (widthheight)**	75725
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

0.29473 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
0.29473	<div class="pre-content heading-holder"></div>,<ul id="p-views" class="page-actions-menu__list"></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

0.29473

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
479.4 ms	518 ms	28.7 ms	28.7 ms	0 ms
No availible script information.

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
452.1 ms	503.2 ms	1.9 ms	1.8 ms	0.1 ms
No availible script information.

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
338.5 ms	398.5 ms	3.9 ms	3.8 ms	0.1 ms
https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cmediawiki.page.media&skin=minerva&version=1wfpc
Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 64327
https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cmediawiki.page.media&skin=minerva&version=1wfpc
Forced Style And Layout Duration: 31 ms Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 64327

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
239.5 ms	36.4 ms	269.1 ms	261 ms	8.1 ms
https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.centralauth.ForeignApi%7Cext.cite.referencePreviews%7Cext.math.popup%7Cext.popups.main%7Cmediawiki.ForeignApi%7Cmediawiki.ForeignApi.core&skin=minerva&version=1mdwo
Invoker: https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.centralauth.ForeignApi%7Cext.cite.referencePreviews%7Cext.math.popup%7Cext.popups.main%7Cmediawiki.ForeignApi%7Cmediawiki.ForeignApi.core&skin=minerva&version=1mdwo Invoker Type: classic-script Window attribution: self
https://en.m.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: 4310
https://en.m.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva
Forced Style And Layout Duration: 21 ms Invoker: FrameRequestCallback Invoker Type: user-callback Source Function Name: flushCssBuffer Window attribution: self Source char position: 3233

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
141.9 ms	200.7 ms	3.1 ms	3.1 ms	0 ms
https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cmediawiki.page.media&skin=minerva&version=1wfpc
Forced Style And Layout Duration: 26 ms Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 64327

Blocking duration

Work duration

Render duration

PreLayout Duration

Style And Layout Duration

141.9 ms

200.7 ms

3.1 ms

0 ms

https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cmediawiki.page.media&skin=minerva&version=1wfpc

Forced Style And Layout Duration: 26 ms

Invoker: TimerHandler:setTimeout
Invoker Type: user-callback
Window attribution: self
Source char position: 64327

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
115.2 ms	119.4 ms	47.6 ms	0 ms	47.6 ms
No availible script information.

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
103 ms	87.5 ms	89.3 ms	76.8 ms	12.5 ms
https://en.m.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: 4310
https://en.m.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: 3233

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
98.9 ms	113.8 ms	36.6 ms	27.4 ms	9.2 ms
https://en.m.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: 4310
https://en.m.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: 3233

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
95.3 ms	619 ms	0.7 ms	0.7 ms	0 ms
https://en.m.wikipedia.org/wiki/Barack_Obama
Invoker: https://en.m.wikipedia.org/wiki/Barack_Obama Invoker Type: classic-script Window attribution: self
https://en.m.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva
Invoker: https://en.m.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
31.4 ms	77 ms	18.6 ms	18.6 ms	0 ms
https://en.m.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: 4310

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	37
Frames	36
JSEventListeners	700
LayoutObjects	945
MediaKeySessions	0
MediaKeys	0
Nodes	30513
Resources	63
ContextLifecycleStateObservers	48
V8PerContextDatas	2
WorkerGlobalScopes	0
UACSSResources	3
RTCPeerConnections	0
ResourceFetchers	37
AdSubframes	0
DetachedScriptStates	0
ArrayBufferContents	0
LayoutCount	21
RecalcStyleCount	874
LayoutDuration	175
RecalcStyleDuration	594
DevToolsCommandDuration	365
ScriptDuration	1554
V8CompileDuration	7
TaskDuration	7445
TaskOtherDuration	4750
ThreadTime	17
ProcessTime	66
JSHeapUsedSize	8525252
JSHeapTotalSize	10534912
FirstMeaningfulPaint	1144

Visual Elements

Name	Display Time	X	Y	Width	Height
LargestImage (wikipedia-wordmark-en.svg)	833 ms	53	18	120	18
<img src="/static/images/mobile/copyright/wikipedia-wordmark-en.svg" alt="Wikipedia" width="120" height="18" style="width: 7.5em; height: 1.125em;">
Heading	4.433 s	16	300	328	37
<h1 id="firstHeading" class="firstHeading mw-first-heading"></h1>
LargestContentfulPaint		16	537	328	246
<p></p>

PageXray

How the page is built.

Summary
HTTP version	HTTP/2.0
Total requests	13
Total domains	4
Total transfer size	373.5 KB
Total content size	1.8 MB
Responses missing compression	6
Number of cookies	2
Third party cookies	0

Requests per response code
200	12
302	1

Largest assets on the page (by transfer size)

URL	Type	Transfer Size	Content Size
https://en.m.wikiped...wiki/Barack_Obama	html	229.1 KB	1.3 MB
https://en.m.wikiped...ia.org/w/load.php	javascript	45.9 KB	156.9 KB
https://upload.wikim..._Barack_Obama.jpg	image	43.4 KB	42.5 KB
https://en.m.wikiped...ia.org/w/load.php	javascript	26.6 KB	122.2 KB
https://en.m.wikiped...ia.org/w/load.php	css	17.8 KB	125.3 KB
https://upload.wikim...signature.svg.png	image	3.2 KB	2.4 KB
https://meta.m.wikim...a.org/w/index.php	javascript	2.3 KB	4.8 KB
https://en.m.wikiped...ia.org/w/load.php	svg	1.2 KB	707 B
https://en.m.wikiped...ia.org/w/load.php	svg	1.1 KB	414 B
https://en.m.wikiped...ia.org/w/load.php	svg	1.1 KB	318 B
https://en.m.wikiped...ia.org/w/load.php	svg	1.0 KB	326 B
https://en.m.wikiped...ia.org/w/load.php	javascript	858 B	61.5 KB
https://meta.wikimed...a.org/w/index.php	other	N/A	0 b

Requests and sizes per content type

Content	Transfer Size	Content Size	Requests
html	229.1 KB	1.3 MB	1
css	17.8 KB	125.3 KB	1
javascript	75.6 KB	345.4 KB	4
image	46.6 KB	44.9 KB	2
svg	4.4 KB	1.7 KB	4
Total	373.5 KB	1.8 MB	12

Data per domain

Domain	Total download time	Transfer Size	Content Size	Requests
en.m.wikipedia.org	2.269 s	324.6 KB	1.7 MB	9
upload.wikimedia.org	320 ms	46.6 KB	44.9 KB	2
meta.wikimedia.org	97 ms	N/A	0 b	1
meta.m.wikimedia.org	100 ms	2.3 KB	4.8 KB	1

Expires and last modified statistics

type	min	median	max
Expires	0 seconds	5 minutes	4 weeks
Last modified	41 seconds	10 weeks	6 years

Console log

The page logs the following messages to the console.

Level	Message
WARNING	https://en.m.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva 11:307 "This page is using the deprecated ResourceLoader module \"mediawiki.Uri\".\n[1.43] Please use browser native URL."
INFO	https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.centralNotice.choiceData%2Cdisplay%2CgeoIP%2CimpressionDiet%2CkvStore%2CstartUp%7Cext.centralauth.centralautologin%7Cext.checkUser.clientHints%7Cext.cx.entrypoints.languagesearcher.init%7Cext.cx.entrypoints.mffrequentlanguages%7Cext.cx.eventlogging.campaigns%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.growthExperiments.SuggestedEditSession%7Cext.urlShortener.toolbar%7Cjquery%2Coojs%2Csite%7Cjquery.client%7Cmediawiki.String%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctemplate%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax%7Cmediawiki.template.mustache%7Cmobile.codex.styles%7Cmobile.init%2Cstartup%7Cmobile.pagelist.styles%7Cmobile.pagesummary.styles%7Cmw.externalguidance.init%7Cskins.minerva.scripts&skin=minerva&version=wwa7c 605:994 "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.m.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva 11:307 "This page is using the deprecated ResourceLoader module \"mediawiki.Uri\".\n[1.43] Please use browser native URL."
INFO	https://en.m.wikipedia.org/w/load.php?lang=en&modules=mobile.init&skin=minerva&version=dfg9v 10:994 "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/"

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	28.9 KB	2
image	0 b	0
font	0 b	0
Total	28.9 KB	3

Requests loaded after onContentLoad

Includes requests done after DOM content loaded.

Content	Transfer Size	Requests
html	0 b	0
css	0 b	0
javascript	28.9 KB	2
image	0 b	0
font	0 b	0
Total	28.9 KB	3

Render blocking requests

Render blocking information directly from Chrome.

Blocking	In body parser blocking	Potentially blocking
1	0	1

Render information

URL	Type
https://en.m.wikiped...ia.org/w/load.php	non_blocking
https://en.m.wikiped...ia.org/w/load.php	non_blocking
https://en.m.wikiped...ia.org/w/load.php	blocking
https://meta.m.wikim...a.org/w/index.php	non_blocking
https://en.m.wikiped...ia.org/w/load.php	potentially_blocking
https://meta.wikimed...a.org/w/index.php	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		1012
Max Potential First Input Delay		384
Long Tasks before First Paint	2	158
Long Tasks before First Contentful Paint	2	158
Long Tasks before Largest Contentful Paint	4	288
Long Tasks after Load Event End	7	1209
Total Long Tasks	15	1820

CPU last long task happened at 4.489 s

Individual Long Tasks

name	startTime	duration	containerType
self	271	63	window
unknown	741	95	window
unknown	1064	68	window
self	1143	62	window
unknown	1253	70	window
unknown	1358	82	window
self	2560	117	window
unknown	2679	54	window
self	2995	112	window
self	3207	384	window
self	3608	63	window
self	3695	92	window
self	3824	272	window
self	4105	188	window
self	4489	98	window

CPU time spent

Calculated using Tracium.

Categories (ms)
parseHTML	1295
styleLayout	746
paintCompositeRender	455
scriptParseCompile	5
scriptEvaluation	1571
garbageCollection	62
other	3301

Events (ms)
RunTask	1597
FunctionCall	1428
ParseHTML	830
CpuProfiler::StartProfiling	582
UpdateLayoutTree	541
HTMLDocumentParser::MaybeFetchQueuedPreloads	450
Layerize	419
Paint	350
Commit	187
Layout	179
PrePaint	141
IntersectionObserverController::computeIntersections	137
DocumentLoader::BodyLoadingFinished	91
PaintImage	78
DecodedDataDocumentParser::AppendBytes	55
v8.run	45
DocumentLoader::CommitNavigation	35
v8.produceCache	18
ParseAuthorStyleSheet	17
HitTest	16
DocumentLoader::BodyDataReceivedImpl	15
RunMicrotasks	14
EventDispatch	13
V8.HandleInterrupts	13
V8.GC_MC_INCREMENTAL_EMBEDDER_TRACING	12
V8.BytecodeBudgetInterrupt	11
V8.GC_SCAVENGER_SCAVENGE_PARALLEL	10

Time spent per request

URL	CPU time (ms)
https://en.m.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva	1601
https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cmediawiki.page.media&skin=minerva&version=1wfpc	698
https://meta.wikimedia.org/w/index.php?title=Special:BannerLoader&campaign=Wiki+Loves+Folklore+2025&banner=wikilovesfolklore2025anon_banner&uselang=en&debug=false	13
https://en.m.wikipedia.org/wiki/Barack_Obama	11

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

Screenshots

afterPageCompleteCheck.jpg

layoutShift.jpg

largestContentfulPaint.jpg

Run 2 summary

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

Summary

Waterfall

Video

Filmstrip

Coach

Coach score

Performance advice (87)

Best practice advice (74)

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

Render blocking requests

Render information

CPU

Long Tasks

Individual Long Tasks

CPU time spent

Time spent per request

Screenshots