Run 3 summary

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

Tested 2026-03-27 06:19:59 using Chrome 146.0.7680.80 (script).(runtime settings).

Test visiting multiple pages on emulated mobile

First hit the Main_Page with an empty browser cache and then visit Barack_Obama

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SummaryWaterfall MetricsVideoFilmstrip CoachPageXrayCPU Screenshots

Summary

MetricValue
Page metrics
Performance score91
Total page size375.5 KB
Requests11
Timing metrics
TTFB117 ms
First Paint516 ms
Fully Loaded7.302 s
Google Web Vitals
TTFB117 ms
First Contentful Paint (FCP) 516 ms
Largest Contentful Paint (LCP) 936 ms
Cumulative Layout Shift (CLS) 0.00
Total Blocking Time1.334 s
Max Potential FID403 ms
CPU metrics
CPU long tasks13
CPU last long task happens at3.237 s
Visual Metrics
First Visual Change500 ms
Speed Index812 ms
Visual Complete 85%933 ms
Visual Complete 99%1.133 s
Last Visual Change3.200 s
Screenshot
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| Waterfall | | Download HAR | 

Waterfall

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| Video | Download | 

Video

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| Filmstrip | 

Filmstrip

Use--filmstrip.showAll to show all filmstrips.

0 s
0.3 sCPU Long Task duration 64 msmwStartup 256 ms
0.4 sCPU Long Task duration 114 ms
0.5 sFirst Visual Change 500 msHeading 500 ms
0.6 sFirst Contentful Paint 516 ms
0.7 s
0.8 sCPU Long Task duration 132 ms
0.9 s
1 sVisual Complete 85% 933 msVisual Complete 95% 933 msLCP <P> 936 msCPU Long Task duration 58 ms
1.1 sCPU Long Task duration 68 ms
1.2 sVisual Complete 99% 1.133 s
1.3 sCPU Long Task duration 327 ms
1.4 s
1.5 sDOM Content Loaded Time 1.495 s
1.6 s
1.7 sPage Load Time 1.629 s
1.8 s
1.9 sCPU Long Task duration 174 ms
2 sCPU Long Task duration 73 ms
2.1 s
2.2 sCPU Long Task duration 403 ms
2.3 s
2.4 s
2.5 s
2.6 sCPU Long Task duration 67 ms
2.7 sCPU Long Task duration 333 ms
3.1 sCPU Long Task duration 175 ms
3.2 sLast Visual Change 3.200 s
3.3 sCPU Long Task duration 74 ms
| Performance advice | Best practice advice | Privacy advice | Page info | Technologies | 

Coach

The coach helps you find performance problems on your web page using web performance best practice rules. And gives you advice on privacy and best practices. Tested using Coach-core version 8.1.3.

I am the coach

Coach score

Performance advice (91)

TitleAdviceScore
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.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva99
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.80
    Description: It's easy to scale images in the browser and make sure they look good in different devices, however that is bad for performance! Scaling images in the browser takes extra CPU time and will hurt performance on mobile. And the user will download extra kilobytes (sometimes megabytes) of data that could be avoided. Don't do that, make sure you create multiple version of the same image server-side and serve the appropriate one.
    Offenders:
  • https://en.wikipedia.org/static/images/mobile/copyright/wikipedia-wordmark-en-25.svg
  • https://en.wikipedia.org/static/images/mobile/copyright/wikipedia-wordmark-en-25.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.95
    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 13 CPU long tasks with the total of 2.062 s. The total blocking time is 1.334 s and 2 long tasks before first contentful paint with total time of 178 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.0
    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
  • unknown
  • self
  • unknown
  • self
  • self
  • self
  • self
  • self
  • self
  • self
  • 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 56.8 kB the next access.80
    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).98
    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=minerva
    • Make each CSS response small (optimalCssSize)https://en.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%7Cext.wp25EasterEggs.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 22.6 kB (22564) and that is bigger than the limit of 14.5 kB. Try to make the CSS files fit into 14.5 KB.90
    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:
    URLTransfer sizeContent size
    https://en.wikipedia.org/w/load.php...ia.org/w/load.php 22.0 KB161.5 KB

    Best practice advice (90)

    TitleAdviceScore
    Meta description (metaDescription)The page is missing a meta description.0
    Description: Use a page description to make the page more relevant to search engines.
    Do not send too long headers (longHeaders)https://en.wikipedia...wiki/Barack_Obama has a header content-security-policy that is 1388 characters long. https://en.wikipedia...wiki/Barack_Obama has a header content-security-policy-report-only that is 1397 characters long. 98
    Description: Do not send response headers that are too long.
    Offenders:
  • https://en.wikipedia.org/wiki/Barack_Obama
  • https://en.wikipedia.org/wiki/Barack_Obama
    • Avoid unnecessary headers (unnecessaryHeaders)There are 7 responses that sets both a max-age and expires header. There are 11 responses that sets a server header. 82
    Description: Do not send headers that you don't need. We look for p3p, cache-control and max-age, pragma, server and x-frame-options headers. Have a look at Andrew Betts - Headers for Hackers talk as a guide https://www.youtube.com/watch?v=k92ZbrY815c or read https://www.fastly.com/blog/headers-we-dont-want.
    Offenders:
  • https://en.wikipedia.org/wiki/Barack_Obama
  • https://en.wikipedia.org/w/load.php...ia.org/w/load.php
  • https://en.wikipedia.org/w/load.php...ia.org/w/load.php
  • https://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/President_Barack_Obama..._Barack_Obama.jpg
  • https://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Barack_Obama_signature...signature.svg.png
  • https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva
  • https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva
  • 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/ins-502b/v2/events?hasty=true

    • Privacy advice (94)

    TitleAdviceScore
    Set a referrer-policy header to make sure you do not leak user information. (referrerPolicyHeader)Set a referrer-policy header to make sure you do not leak user information.0
    Description: Referrer Policy is a new header that allows a site to control how much information the browser includes with navigations away from a document and should be set by all sites. https://scotthelme.co.uk/a-new-security-header-referrer-policy/.
    Offenders:
  • https://en.wikipedia.org/wiki/Barack_Obama

    • Page info

    Page info
    TitleBarack Obama - Wikipedia
    GeneratorMediaWiki 1.46.0-wmf.21
    Width360
    Height6511
    DOM elements14017
    Avg DOM depth14
    Max DOM depth23
    Iframes0
    Script tags7
    Local storage773.6 KB
    Session storage0 b
    Network Information API4g
    Resource Hints
    dns-prefetch
    https://meta.wikimedia.org/
    https://en.wikipedia.org/wiki/auth.wikimedia.org
    preconnect
    https://upload.wikimedia.org/

    Technologies used to build the page.

    Data collected using Wappalyzer version 6.10.54. With updated code from Webappanalyzer 2024-12-27. Use --browsertime.firefox.includeResponseBodies htmlor --browsertime.chrome.includeResponseBodies htmlto help Wappalyzer find more information about technologies used.

    TechnologyConfidenceCategory
    MediaWiki 100  Wikis
    PHP 100  Programming languages
    HSTS 100  Security
    | Browser metrics | Visual Metrics | Largest Contentful Paint | Cumulative Layout Shift | Long Aninimation Frames | Visual Elements | Metrics from CDP | Server timings | 

    Visual Metrics

    Visual Metrics
    First Visual Change500 ms
    Speed Index812 ms
    Heading500 ms
    LargestContentfulPaint933 ms
    Last Meaningful Paint933 ms
    Largest Contentful Paint933 ms
    Visual Complete 85%933 ms
    Visual Complete 95%933 ms
    Visual Complete 99%1.133 s
    Last Visual Change3.200 s
    Visual Readiness2.700 s

    Browser Metrics

    Navigation Timing
    backEndTime117 ms
    domContentLoadedTime1.495 s
    domInteractiveTime1.495 s
    domainLookupTime0 ms
    frontEndTime1.296 s
    pageDownloadTime216 ms
    pageLoadTime1.629 s
    redirectionTime0 ms
    serverConnectionTime0 ms
    serverResponseTime328 ms
    Google Web Vitals
    Time to first byte (TTFB)117 ms
    First Contentful Paint (FCP)516 ms
    Largest Contentful Paint (LCP)936 ms
    Total Blocking Time (TBT)1.334 s
    First Contentful Paint info
    Elements that needed recalculate style before FCP101
    Time spent in recalculate style before FCP60.162 ms
    Extra timings
    TTFB117 ms
    First Paint516 ms
    Load Event End1.629 s
    Fully loaded7.302 s
    User Timing marks
    mwStartup256 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 typeP
    Element/tag<p></p>
    Render time 936 ms
    Element render delay819 ms
    TTFB117 ms
    Resource delay0 ms
    Resource load duration0 ms
    Elements that needed recalculate style before LCP358
    Time spent in recalculate style before LCP123.372 ms
    Load time0 ms
    Size (width*height)76191
    DOM path
    div#mw-mf-viewport > div#mw-mf-page-center > main#content > div#bodyContent > div#mw-content-text > div:eq(0) > section#mf-section-0 > p:eq(1)> div#mw-mf-viewport > div#mw-mf-page-center > main#content > div#bodyContent > div#mw-content-text > div:eq(0) > section#mf-section-0 > p:eq(1)>
    LCP

    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 durationRender durationPreLayout DurationStyle And Layout Duration
    355.7 ms426.8 ms1.8 ms0 ms1.8 ms
    https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.page.media&skin=minerva&version=edfqa

    Invoker:  TimerHandler:setTimeout
    Invoker Type: user-callback
    Window attribution: self
    Source char position: 78328

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

    Forced Style And Layout Duration: 25 ms

    Invoker:  TimerHandler:setTimeout
    Invoker Type: user-callback
    Window attribution: self
    Source char position: 78328

    Blocking duration Work durationRender durationPreLayout DurationStyle And Layout Duration
    283 ms20 ms322.3 ms313 ms9.3 ms
    https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva

    Invoker:  IdleRequestCallback
    Invoker Type: user-callback
    Source Function Name:  doPropagation
    Window attribution: self
    Source char position: 4314

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

    Forced Style And Layout Duration: 41 ms

    Invoker:  FrameRequestCallback
    Invoker Type: user-callback
    Source Function Name:  flushCssBuffer
    Window attribution: self
    Source char position: 3240

    Blocking duration Work durationRender durationPreLayout DurationStyle And Layout Duration
    280.5 ms331.2 ms3.1 ms0 ms3.1 ms
    https://en.wikipedia.org/wiki/Barack_Obama

    Invoker:  https://en.wikipedia.org/wiki/Barack_Obama
    Invoker Type: classic-script
    Window attribution: self

    Blocking duration Work durationRender durationPreLayout DurationStyle And Layout Duration
    195 ms174.9 ms70 ms58.1 ms11.9 ms
    https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva

    Invoker:  IdleRequestCallback
    Invoker Type: user-callback
    Source Function Name:  doPropagation
    Window attribution: self
    Source char position: 4314

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

    Invoker:  FrameRequestCallback
    Invoker Type: user-callback
    Source Function Name:  flushCssBuffer
    Window attribution: self
    Source char position: 3240

    Blocking duration Work durationRender durationPreLayout DurationStyle And Layout Duration
    126.8 ms191.1 ms1.2 ms0.1 ms1.1 ms
    https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.page.media&skin=minerva&version=edfqa

    Invoker:  TimerHandler:setTimeout
    Invoker Type: user-callback
    Window attribution: self
    Source char position: 78328

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

    Forced Style And Layout Duration: 29 ms

    Invoker:  TimerHandler:setTimeout
    Invoker Type: user-callback
    Window attribution: self
    Source char position: 78328

    Blocking duration Work durationRender durationPreLayout DurationStyle And Layout Duration
    119 ms172.9 ms104.2 ms0.1 ms104.1 ms
    https://en.wikipedia.org/wiki/Barack_Obama

    Invoker:  https://en.wikipedia.org/wiki/Barack_Obama
    Invoker Type: classic-script
    Window attribution: self

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

    Invoker:  https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva
    Invoker Type: classic-script
    Window attribution: self

    Blocking duration Work durationRender durationPreLayout DurationStyle And Layout Duration
    83 ms25.6 ms120.3 ms0 ms120.3 ms
    https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.page.media&skin=minerva&version=edfqa

    Invoker:  https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.page.media&skin=minerva&version=edfqa
    Invoker Type: classic-script
    Window attribution: self

    Blocking duration Work durationRender durationPreLayout DurationStyle And Layout Duration
    60.4 ms91.4 ms52.2 ms0 ms52.2 ms
    https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva

    Invoker:  IdleRequestCallback
    Invoker Type: user-callback
    Source Function Name:  doPropagation
    Window attribution: self
    Source char position: 4314

    Blocking duration Work durationRender durationPreLayout DurationStyle And Layout Duration
    42.5 ms92.5 ms0 ms0 ms0 ms
    No availible script information.
    Blocking duration Work durationRender durationPreLayout DurationStyle And Layout Duration
    31.1 ms45.4 ms58.6 ms43.7 ms14.9 ms
    https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva

    Invoker:  IdleRequestCallback
    Invoker Type: user-callback
    Source Function Name:  doPropagation
    Window attribution: self
    Source char position: 4314

    https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%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.page.media&skin=minerva&version=edfqa

    Invoker:  TimerHandler:setTimeout
    Invoker Type: user-callback
    Window attribution: self
    Source char position: 78328

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

    Invoker:  FrameRequestCallback
    Invoker Type: user-callback
    Source Function Name:  flushCssBuffer
    Window attribution: self
    Source char position: 3240

    Server timings

    namedurationdescription
    cache0hit-front
    host0cp3070

    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

    namevalue
    AudioHandlers0
    AudioWorkletProcessors0
    Documents25
    Frames23
    JSEventListeners1929
    LayoutObjects956
    MediaKeySessions0
    MediaKeys0
    Nodes32615
    Resources58
    ContextLifecycleStateObservers48
    V8PerContextDatas2
    WorkerGlobalScopes0
    UACSSResources3
    RTCPeerConnections0
    ResourceFetchers25
    AdSubframes0
    DetachedScriptStates0
    ArrayBufferContents3
    LayoutCount20
    RecalcStyleCount21
    LayoutDuration162
    RecalcStyleDuration308
    DevToolsCommandDuration610
    ScriptDuration1524
    V8CompileDuration8
    TaskDuration3852
    TaskOtherDuration1240
    ThreadTime18
    ProcessTime66
    JSHeapUsedSize9846012
    JSHeapTotalSize14700544
    FirstMeaningfulPaint933

    Visual Elements

    NameDisplay TimeX YWidthHeight
    LargestImage (250px-President_Barack_Obama.jpg) 55 599 250 312
    <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">
    Heading500 ms 16 75 328 37
    <h1 id="firstHeading" class="firstHeading mw-first-heading"></h1>
    LargestContentfulPaint933 ms 16 286 328 246
    <p></p>
    | Summary  | Largest responses  | Requests and sizes per content type  | Data per domain | Expires and last modified statistics  | Console log  | Requests loaded after onLoad event  | Render blocking requests  | 

    PageXray

    How the page is built.

    Summary
    HTTP versionHTTP/2.0
    Total requests11
    Total domains2
    Total transfer size375.5 KB
    Total content size1.8 MB
    Responses missing compression4
    Number of cookies3
    Third party cookies0
    Requests per response code
    20010
    2021

    Largest assets on the page (by transfer size)

    URLTypeTransfer SizeContent Size
    https://en.wikipedia...wiki/Barack_Obamahtml241.4 KB1.3 MB
    https://upload.wikim..._Barack_Obama.jpgimage51.0 KB49.9 KB
    https://en.wikipedia...ia.org/w/load.phpjavascript50.1 KB173.6 KB
    https://en.wikipedia...ia.org/w/load.phpcss22.0 KB161.5 KB
    https://upload.wikim...signature.svg.pngimage4.4 KB3.3 KB
    https://en.wikipedia...ia.org/w/load.phpsvg1.3 KB707 B
    https://en.wikipedia...ia.org/w/load.phpsvg1.2 KB414 B
    https://en.wikipedia...ia.org/w/load.phpsvg1.2 KB318 B
    https://en.wikipedia...ia.org/w/load.phpsvg1.1 KB326 B
    https://en.wikipedia...ia.org/w/load.phpjavascript938 B65.6 KB
    https://en.wikipedia...ns-502b/v2/eventsplain881 B0 b

    Requests and sizes per content type

    ContentHeader SizeTransfer SizeContent SizeRequests
    html0 b241.4 KB1.3 MB1
    css0 b22.0 KB161.5 KB1
    javascript0 b51.0 KB239.1 KB2
    image0 b55.4 KB53.2 KB2
    svg0 b4.8 KB1.7 KB4
    plain0 b881 B0 b1
    Total0 b375.5 KB1.8 MB11

    Data per domain

    DomainTotal download timeTransfer SizeContent SizeRequests
    en.wikipedia.org1.412 s320.1 KB1.7 MB9
    upload.wikimedia.org391 ms55.4 KB53.2 KB2

    Expires and last modified statistics

    typeminmedianmax
    Expires0 seconds5 minutes4 weeks
    Last modified28 minutes5 weeks44 weeks

    Console log

    The page logs the following messages to the console.

    LevelMessage
    INFO https://en.wikipedia.org/w/load.php?lang=en&modules=ext.centralNotice.bannerHistoryLogger%2CchoiceData%2Cdisplay%2CgeoIP%2CimpressionDiet%2CkvStore%2ClargeBannerLimit%2ClegacySupport%2CstartUp%7Cext.centralauth.ForeignApi%2Ccentralautologin%7Cext.checkUser.clientHints%7Cext.cx.entrypoints.languagesearcher.init%7Cext.cx.entrypoints.mffrequentlanguages%7Cext.cx.eventlogging.campaigns%7Cext.cx.model%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CtestKitchen%2CwikimediaEvents%2Cwp25EasterEggs%7Cext.eventLogging.metricsPlatform%7Cext.growthExperiments.SuggestedEditSession%7Cext.parsermigration.survey%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Coojs%2Csite%7Cjquery.client%2CtextSelection%7Cmediawiki.DateFormatter%2CForeignApi%2CString%2CTitle%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctemplate%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.ForeignApi.core%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax%7Cmediawiki.template.mustache%7Cmobile.codex.styles%7Cmobile.init%2Cstartup%7Cmw.cx.SiteMapper%7Cmw.externalguidance.init%7Cskins.minerva.scripts%7Cwikibase.databox.fromWikidata&skin=minerva&version=udz1b 735:14087 "Hello friend! 🍦\n\nWikipedia is powered by MediaWiki. MediaWiki is open source software and we're always keen to hear from fellow developers about what you love (😍) or what we could be doing better (😱).\n\n💪 Or work for us @ https://wikimediafoundation.org/about/jobs/"
    INFO https://en.wikipedia.org/w/load.php?lang=en&modules=mobile.init&skin=minerva&version=tovvx 0:14087 "Hello friend! 🍦\n\nWikipedia is powered by MediaWiki. MediaWiki is open source software and we're always keen to hear from fellow developers about what you love (😍) or what we could be doing better (😱).\n\n💪 Or work for us @ https://wikimediafoundation.org/about/jobs/"

    Requests loaded after onLoad event

    Included requests done after load event end.

    ContentTransfer SizeRequests
    html0 b0
    css0 b0
    javascript0 b0
    image0 b0
    font0 b0
    plain881 B1
    Total881 B1

    Requests loaded after onContentLoad

    Includes requests done after DOM content loaded.

    ContentTransfer SizeRequests
    html0 b0
    css0 b0
    javascript0 b0
    image0 b0
    font0 b0
    plain881 B1
    Total881 B1

    Render blocking requests

    Render blocking information directly from Chrome.

    BlockingIn body parser blockingPotentially blocking
    101

    Render information

    URLType
    https://en.wikipedia...ia.org/w/load.phpnon_blocking
    https://en.wikipedia...ia.org/w/load.phpblocking
    https://en.wikipedia...ia.org/w/load.phppotentially_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.

    TypeQuantityTotal duration (ms)
    Total Blocking Time 1334
    Max Potential First Input Delay 403
    Long Tasks before First Paint2178
    Long Tasks before First Contentful Paint2178
    Long Tasks before Largest Contentful Paint3310
    Long Tasks after Load Event End71299
    Total Long Tasks132062

    CPU last long task happened at 3.237 s

    Individual Long Tasks

    namestartTimedurationcontainerIdcontainerNamecontainerSrccontainerType
    self25464window
    unknown387114window
    unknown795132window
    self95658window
    unknown102068window
    self1234327window
    self1819174window
    self199473window
    self2123403window
    self258867window
    self2675333window
    self3021175window
    self323774window

    CPU time spent

    Calculated using Tracium.

    Categories (ms)
    parseHTML412
    styleLayout471
    paintCompositeRender65
    scriptParseCompile8
    scriptEvaluation1546
    garbageCollection32
    other1426
    Events (ms)
    FunctionCall1376
    CpuProfiler::StartProfiling585
    RunTask549
    ParseHTML390
    UpdateLayoutTree295
    Layout165
    DocumentLoader::BodyLoadingFinished92
    DecodedDataDocumentParser::AppendBytes86
    v8.run51
    V8.HandleInterrupts49
    Paint44
    PrePaint22
    ParseAuthorStyleSheet19
    v8.produceCache16
    PaintImage15
    Layerize15
    RunMicrotasks15
    DocumentLoader::BodyDataReceivedImpl14
    HTMLDocumentParser::MaybeFetchQueuedPreloads13

    Time spent per request

    URLCPU time (ms)
    https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva1618
    https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.ux-enhancements%7Cext.phonos.init%7Cext.quicksurveys.init%2Clib%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cjquery.spinner%7Cjquery.spinner.styles%7Cmediawiki.page.media&skin=minerva&version=edfqa680
    https://en.wikipedia.org/wiki/Barack_Obama19
    | afterPageCompleteCheck.jpg | layoutShift.jpg | largestContentfulPaint.jpg | 

    Screenshots

    afterPageCompleteCheck.jpg

    afterPageCompleteCheck.jpg

    layoutShift.jpg

    layoutShift.jpg

    largestContentfulPaint.jpg

    largestContentfulPaint.jpg