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

Summary

Metric	Value
Page metrics
Performance score	91
Total page size	393.3 KB
Requests	11
Timing metrics
TTFB	123 ms
First Paint	836 ms
Fully Loaded	2.218 s
Google Web Vitals
TTFB	123 ms
First Contentful Paint (FCP)	836 ms
Largest Contentful Paint (LCP)	1.136 s
Cumulative Layout Shift (CLS)	0.00
Total Blocking Time	1.410 s
Max Potential FID	411 ms
CPU metrics
CPU long tasks	14
CPU last long task happens at	3.624 s
Visual Metrics
First Visual Change	867 ms
Speed Index	1.414 s
Visual Complete 85%	1.167 s
Visual Complete 99%	6.600 s
Last Visual Change	6.633 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 63 msmwStartup 280 ms

0.8 sCPU Long Task duration 106 ms

0.9 sFirst Contentful Paint 836 msFirst Visual Change 867 msHeading 867 ms

1 sCPU Long Task duration 128 ms

1.1 s

1.2 sLCP <P> 1.136 sCPU Long Task duration 65 msVisual Complete 85% 1.167 s

1.3 s

1.4 sCPU Long Task duration 68 ms

1.5 sCPU Long Task duration 297 ms

1.8 sCPU Long Task duration 95 ms

1.9 sDOM Content Loaded Time 1.858 sPage Load Time 1.877 s

2.1 sCPU Long Task duration 115 ms

2.2 sCPU Long Task duration 53 ms

2.3 sFully Loaded 2.218 sCPU Long Task duration 411 ms

2.8 sCPU Long Task duration 99 ms

3 sCPU Long Task duration 347 ms

3.3 sCPU Long Task duration 237 ms

3.6 s

3.7 sCPU Long Task duration 95 ms

6.6 sVisual Complete 95% 6.600 sVisual Complete 99% 6.600 s

6.7 sLast Visual Change 6.633 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 90
Performance score 91
Privacy score 88
Best practice score 90

Performance advice (91)

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.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 14 CPU long tasks with the total of 2.179 s. The total blocking time is 1.410 s and 2 long tasks before first contentful paint with total time of 169 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 extra requests by setting cache headers (cacheHeaders)

The page has 2 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 56.6 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

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=site.styles&only=styles&skin=minerva

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 21.4 kB (21383) 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	20.9 KB	153.7 KB

Best practice advice (90)

Title	Advice	Score
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 11 responses that sets a server header.	81
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=site.styles&only=styles&skin=minerva https://en.m.wikipedia.org/w/load.php?lang=en&modules=site.styles&only=styles&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

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 1.45.0-wmf.9
Width	360
Height	6704
DOM elements	13791
Avg DOM depth	14
Max DOM depth	23
Iframes	0
Script tags	7
Local storage	814.2 KB
Session storage	0 b
Network Information API	4g

Resource Hints
dns-prefetch
https://meta.wikimedia.org/
https://en.m.wikipedia.org/wiki/auth.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
Apache Traffic Server 9.2.11	100	Web servers
HSTS	100	Security

Visual Metrics

Visual Metrics
First Visual Change	867 ms
Speed Index	1.414 s
Heading	867 ms
LargestContentfulPaint	1.167 s
Last Meaningful Paint	1.167 s
Largest Contentful Paint	1.167 s
Visual Complete 85%	1.167 s
Visual Complete 95%	6.600 s
Visual Complete 99%	6.600 s
Last Visual Change	6.633 s
Visual Readiness	5.766 s

Browser Metrics

Navigation Timing
backEndTime	123 ms
domContentLoadedTime	1.858 s
domInteractiveTime	1.858 s
domainLookupTime	0 ms
frontEndTime	1.547 s
pageDownloadTime	207 ms
pageLoadTime	1.877 s
redirectionTime	0 ms
serverConnectionTime	0 ms
serverResponseTime	323 ms

Google Web Vitals
Time to first byte (TTFB)	123 ms
First Contentful Paint (FCP)	836 ms
Largest Contentful Paint (LCP)	1.136 s
Total Blocking Time (TBT)	1.410 s

First Contentful Paint info
Elements that needed recalculate style before FCP	108
Time spent in recalculate style before FCP	48.476 ms

Extra timings
TTFB	123 ms
First Paint	836 ms
Load Event End	1.877 s
Fully loaded	2.218 s

User Timing marks
mwStartup	280 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	1.136 s
Element render delay	1.013 s
TTFB	123 ms
Resource delay	0 ms
Resource load duration	0 ms
Elements that needed recalculate style before LCP	415
Time spent in recalculate style before LCP	113.106 ms
Load time	0 ms
*Size (widthheight)**	67275
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

No layout shift detected.

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
364.7 ms	425.3 ms	3.5 ms	2 ms	1.5 ms
https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.centralauth.ForeignApi%7Cext.cite.ux-enhancements%7Cext.cx.entrypoints.mffrequentlanguages%7Cext.cx.model%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.ForeignApi%7Cmediawiki.ForeignApi.core%7Cmediawiki.page.media%7Cmw.cx.SiteMapper&skin=minerva&version=105vq
Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 87368
https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.centralauth.ForeignApi%7Cext.cite.ux-enhancements%7Cext.cx.entrypoints.mffrequentlanguages%7Cext.cx.model%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.ForeignApi%7Cmediawiki.ForeignApi.core%7Cmediawiki.page.media%7Cmw.cx.SiteMapper&skin=minerva&version=105vq
Forced Style And Layout Duration: 21 ms Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 87368

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
303.6 ms	299.2 ms	56 ms	55.9 ms	0.1 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

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
302.4 ms	25.8 ms	334.8 ms	326.1 ms	8.7 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: 4314
https://en.m.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva
Forced Style And Layout Duration: 27 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
188.8 ms	254.5 ms	1.7 ms	1.7 ms	0 ms
https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.centralauth.ForeignApi%7Cext.cite.ux-enhancements%7Cext.cx.entrypoints.mffrequentlanguages%7Cext.cx.model%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.ForeignApi%7Cmediawiki.ForeignApi.core%7Cmediawiki.page.media%7Cmw.cx.SiteMapper&skin=minerva&version=105vq
Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 87368
https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.centralauth.ForeignApi%7Cext.cite.ux-enhancements%7Cext.cx.entrypoints.mffrequentlanguages%7Cext.cx.model%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.ForeignApi%7Cmediawiki.ForeignApi.core%7Cmediawiki.page.media%7Cmw.cx.SiteMapper&skin=minerva&version=105vq
Forced Style And Layout Duration: 28 ms Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 87368

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
113.7 ms	115.2 ms	48.7 ms	35.9 ms	12.8 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: 4314
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: 3240

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
112.1 ms	599 ms	1.4 ms	1.4 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
77 ms	29.3 ms	116.4 ms	0 ms	116.4 ms
https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.centralauth.ForeignApi%7Cext.cite.ux-enhancements%7Cext.cx.entrypoints.mffrequentlanguages%7Cext.cx.model%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.ForeignApi%7Cmediawiki.ForeignApi.core%7Cmediawiki.page.media%7Cmw.cx.SiteMapper&skin=minerva&version=105vq
Invoker: https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.centralauth.ForeignApi%7Cext.cite.ux-enhancements%7Cext.cx.entrypoints.mffrequentlanguages%7Cext.cx.model%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.ForeignApi%7Cmediawiki.ForeignApi.core%7Cmediawiki.page.media%7Cmw.cx.SiteMapper&skin=minerva&version=105vq Invoker Type: classic-script Window attribution: self

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
60.9 ms	48 ms	88.8 ms	74 ms	14.8 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: 4314
https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.cite.referencePreviews%7Cext.math.popup%7Cext.popups.main&skin=minerva&version=kdssg
Invoker: https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.cite.referencePreviews%7Cext.math.popup%7Cext.popups.main&skin=minerva&version=kdssg 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: 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
48.7 ms	102.2 ms	3 ms	0.1 ms	2.9 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: flushWrites Window attribution: self Source char position: 19340

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
46.8 ms	101.8 ms	31.4 ms	30.2 ms	1.2 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: 4314

Server timings

name	duration	description
cache	0	hit-front
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	41
Frames	34
JSEventListeners	725
LayoutObjects	1025
MediaKeySessions	0
MediaKeys	0
Nodes	32231
Resources	65
ContextLifecycleStateObservers	53
V8PerContextDatas	2
WorkerGlobalScopes	0
UACSSResources	3
RTCPeerConnections	0
ResourceFetchers	41
AdSubframes	0
DetachedScriptStates	0
ArrayBufferContents	3
LayoutCount	20
RecalcStyleCount	31
LayoutDuration	167
RecalcStyleDuration	312
DevToolsCommandDuration	382
ScriptDuration	1642
V8CompileDuration	9
TaskDuration	3898
TaskOtherDuration	1385
ThreadTime	14
ProcessTime	57
JSHeapUsedSize	10991684
JSHeapTotalSize	15429632
FirstMeaningfulPaint	1134

Visual Elements

Name	Display Time	X	Y	Width	Height
LargestImage (250px-President_Barack_Obama.jpg)		55	598	250	312
<img alt="Obama standing in the Oval Office with his arms folded and smiling" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/250px-President_Barack_Obama.jpg" decoding="async" width="250" height="312" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama.jpg/500px-President_Barack_Obama.jpg 1.5x" data-file-width="2687" data-file-height="3356">
Heading	867 ms	16	75	328	37
<h1 id="firstHeading" class="firstHeading mw-first-heading"></h1>
LargestContentfulPaint	1.167 s	16	312	328	219
<p></p>

PageXray

How the page is built.

Summary
HTTP version	HTTP/2.0
Total requests	11
Total domains	2
Total transfer size	393.3 KB
Total content size	1.8 MB
Responses missing compression	4
Number of cookies	3
Third party cookies	0

Requests per response code
200	11

Largest assets on the page (by transfer size)

URL	Type	Transfer Size	Content Size
https://en.m.wikiped...wiki/Barack_Obama	html	233.5 KB	1.3 MB
https://en.m.wikiped...ia.org/w/load.php	javascript	53.9 KB	189.6 KB
https://upload.wikim..._Barack_Obama.jpg	image	51.0 KB	49.9 KB
https://en.m.wikiped...ia.org/w/load.php	javascript	24.6 KB	116.8 KB
https://en.m.wikiped...ia.org/w/load.php	css	20.9 KB	153.7 KB
https://upload.wikim...signature.svg.png	image	4.3 KB	3.3 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	css	762 B	2.0 KB

Requests and sizes per content type

Content	Transfer Size	Content Size	Requests
html	233.5 KB	1.3 MB	1
css	21.6 KB	155.6 KB	2
javascript	78.4 KB	306.4 KB	2
image	55.3 KB	53.2 KB	2
svg	4.4 KB	1.7 KB	4
Total	393.3 KB	1.8 MB	11

Data per domain

Domain	Total download time	Transfer Size	Content Size	Requests
en.m.wikipedia.org	2.198 s	338.0 KB	1.7 MB	9
upload.wikimedia.org	350 ms	55.3 KB	53.2 KB	2

Expires and last modified statistics

type	min	median	max
Expires	0 seconds	4 weeks	4 weeks
Last modified	13 minutes	7 weeks	28 weeks

Console log

The page logs the following messages to the console.

Level	Message
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.eventlogging.campaigns%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%2CxLab%7Cext.eventLogging.metricsPlatform%7Cext.growthExperiments.SuggestedEditSession%7Cext.urlShortener.toolbar%7Cjquery%2Coojs%2Csite%7Cjquery.client%7Cmediawiki.DateFormatter%2CString%2CTitle%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=1mteh 592:11006 "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/"
INFO	https://en.m.wikipedia.org/w/load.php?lang=en&modules=mobile.init&skin=minerva&version=1bd3h 0:11006 "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/"

Level

Message

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.eventlogging.campaigns%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%2CxLab%7Cext.eventLogging.metricsPlatform%7Cext.growthExperiments.SuggestedEditSession%7Cext.urlShortener.toolbar%7Cjquery%2Coojs%2Csite%7Cjquery.client%7Cmediawiki.DateFormatter%2CString%2CTitle%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=1mteh 592:11006 "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/"

INFO

https://en.m.wikipedia.org/w/load.php?lang=en&modules=mobile.init&skin=minerva&version=1bd3h 0:11006 "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	24.6 KB	1
image	0 b	0
font	0 b	0
Total	24.6 KB	1

Requests loaded after onContentLoad

Includes requests done after DOM content loaded.

Content	Transfer Size	Requests
html	0 b	0
css	0 b	0
javascript	24.6 KB	1
image	0 b	0
font	0 b	0
Total	24.6 KB	1

Render blocking requests

Render blocking information directly from Chrome.

Blocking	In body parser blocking	Potentially blocking
2	0	0

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://en.m.wikiped...ia.org/w/load.php	blocking

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

CPU

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

Download trace log

Long Tasks

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

Type	Quantity	Total duration (ms)
Total Blocking Time		1410
Max Potential First Input Delay		411
Long Tasks before First Paint	2	169
Long Tasks before First Contentful Paint	2	169
Long Tasks before Largest Contentful Paint	3	297
Long Tasks after Load Event End	7	1357
Total Long Tasks	14	2179

CPU last long task happened at 3.624 s

Individual Long Tasks

name	startTime	duration	containerType
self	277	63	window
unknown	710	106	window
unknown	997	128	window
self	1157	65	window
unknown	1303	68	window
self	1446	297	window
unknown	1745	95	window
self	2070	115	window
self	2186	53	window
self	2298	411	window
self	2780	99	window
self	2905	347	window
self	3267	237	window
self	3624	95	window

CPU time spent

Calculated using Tracium.

Categories (ms)
parseHTML	459
styleLayout	495
paintCompositeRender	94
scriptParseCompile	9
scriptEvaluation	1640
garbageCollection	42
other	1432

Events (ms)
FunctionCall	1493
RunTask	597
CpuProfiler::StartProfiling	540
ParseHTML	429
UpdateLayoutTree	296
Layout	175
DocumentLoader::BodyLoadingFinished	98
DecodedDataDocumentParser::AppendBytes	68
v8.run	52
Paint	52
DocumentLoader::CommitNavigation	29
PaintImage	26
PrePaint	25
V8.HandleInterrupts	22
Layerize	21
ParseAuthorStyleSheet	18
v8.produceCache	17
DocumentLoader::BodyDataReceivedImpl	15
RunMicrotasks	14
DocumentLoader::FinishedLoading	11
Commit	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	1688
https://en.m.wikipedia.org/w/load.php?lang=en&modules=ext.centralauth.ForeignApi%7Cext.cite.ux-enhancements%7Cext.cx.entrypoints.mffrequentlanguages%7Cext.cx.model%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.ForeignApi%7Cmediawiki.ForeignApi.core%7Cmediawiki.page.media%7Cmw.cx.SiteMapper&skin=minerva&version=105vq	755
https://en.m.wikipedia.org/wiki/Barack_Obama	35

| 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 (91)

Best practice advice (90)

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