Run 2 summary

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

Tested using Chrome 90.0.4430.85 (runtime settings).

All runs: 1 - 2 - 3

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SummaryWaterfall MetricsVideoFilmstrip CoachPageXrayCPU Third partyScreenshots

Summary

MetricValue
Performance score72
Total page size1.3 MB
Requests105
TTFB159 ms
Fully Loaded2.212 s
First Visual Change710 ms
FCP717 ms
LCP717 ms
CLS0.04439476739790242
Total Blocking Time364 ms
Max Potential FID103 ms
CPU long tasks12
Speed Index751 ms
Visual Complete 85%839 ms
Visual Complete 99%1.645 s
Last Visual Change2.161 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
0.4 sCPU Long Task duration 329 ms
0.8 sFirst Visual Change 710 msFirst Contentful Paint 717 msLCP <P> 717 msCPU Long Task duration 53 ms
0.9 sVisual Complete 85% 839 msVisual Complete 95% 839 ms
1 smwStartup 939 msCPU Long Task duration 60 ms
1.1 sCPU Long Task duration 83 ms
1.2 sCPU Long Task duration 64 ms
1.3 sCPU Long Task duration 96 ms
1.5 sCPU Long Task duration 103 ms
1.6 sCPU Long Task duration 92 ms
1.7 sVisual Complete 99% 1.645 sCPU Long Task duration 100 ms
1.9 sDOM Content Loaded Time 1.815 sCPU Long Task duration 91 ms
2.1 smwCentralNoticeBanner 2.011 sCPU Long Task duration 82 ms
2.2 sLayout Shift 0.04424 2.132 sLast Visual Change 2.161 sLayout Shift 0.00016 2.165 sPage Load Time 2.168 s
| 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.

I am the coach

Coach score

Performance advice (72)

TitleAdviceScore
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 12 CPU long tasks with the total of 1243 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 Task.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.
Offenders:
  • unknown
  • unknown
  • unknown
  • unknown
  • self
  • self
  • self
  • unknown
  • self
  • self
  • unknown
  • self
Avoid extra requests by setting cache headers (cacheHeaders)The page has 84 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 766.5 kB the next access.0
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:
Long cache headers is good (cacheHeadersLong)The page has 3 requests that have a shorter cache time than 30 days (but still a cache time).97
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:
Total image size shouldn't be too big (imageSize)The page total image size is 776.1 kB. It's really big. Is the page using the right format for the images? Are they compressed as good as they can be? Make them smaller by using https://imageoptim.com/.50
Description: Avoid having too many large images on the page. The images will not affect the first paint of the page, but it will eat bandwidth for the user.
Total JavaScript size shouldn't be too big (javascriptSize)The total JavaScript transfer size is 238.1 kB and the uncompressed size is 834.6 kB. This is quite large. 0
Description: A lot of JavaScript often means you are downloading more than you need. How complex is the page and what can the user do on the page? Do you use multiple JavaScript frameworks?
Don't use private headers on static content (privateAssets)The page has 2 requests with private headers. The main page has a private header. It could be right in some cases where the user can be logged in and served specific content. But if your asset is static it should never be private. Make sure that the assets really should be private and only used by one user. Otherwise, make it cacheable for everyone.90
Description: If you set private headers on content, that means that the content are specific for that user. Static content should be able to be cached and used by everyone. Avoid setting the cache header to private.
Offenders:

Best practice advice (84)

TitleAdviceScore
Cumulative Layout Shift (layoutShift)You have elements that shift. You should manually check the filmstrip or video and check if it will affect the user.96
Description: Cumulative Layout Shift measures the sum total of all individual layout shift scores for every unexpected layout shift that occurs during the entire lifespan of the page. A layout shift occurs any time a visible element changes its position from one rendered frame to the next.
Offenders:
  • H1 firstHeading
  • DIV
  • DIV mw-body-content mw-content-ltr
  • #text undefined
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 3 responses that sets a p3p header. There are 10 responses that sets both a max-age and expires header. There are 105 responses that sets a server header. 0
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:

Privacy advice (90)

TitleAdviceScore
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:
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:

Page info

Page info
TitleBarack Obama - Wikipedia
GeneratorMediaWiki 1.37.0-wmf.6
Width1350
Height40983
DOM elements18960
Avg DOM depth14
Max DOM depth29
Iframes0
Script tags6
Local storage611.5 KB
Session storage0 b
HTML vs AMPPlain good HTML page
Resource Hints
dns-prefetch
https://login.wikimedia.org/
https://meta.wikimedia.org/
preconnect
https://upload.wikimedia.org/

Technologies used to build the page.

Data collected using Wappalyzer.  Use --browsertime.firefox.includeResponseBodies htmlor --browsertime.chrome.includeResponseBodies htmlto help Wappalyser find more information about technologies used.

TechnologyConfidenceCategory
MediaWiki 100  Wikis
PHP 100  Programming languages
Bootstrap 2100  UI frameworks
jQuery 100  JavaScript libraries
| Browser metrics | Visual Metrics | Largest Contentful Paint | Cumulative Layout Shift | Metrics from CDP | Server timings | 

Visual Metrics

Visual Metrics
First Visual Change710 ms
Speed Index751 ms
Visual Complete 85%839 ms
Visual Complete 95%839 ms
Visual Complete 99%1.645 s
Last Visual Change2.161 s
Visual Readiness1.451 s

Browser Metrics

Navigation Timing
backEndTime159 ms
domContentLoadedTime1.815 s
domInteractiveTime1.814 s
domainLookupTime3 ms
frontEndTime1.126 s
pageDownloadTime884 ms
pageLoadTime2.168 s
redirectionTime0 ms
serverConnectionTime73 ms
serverResponseTime952 ms
Google Web Vitals
First Contentful Paint (FCP)717 ms
Largest Contentful Paint (LCP)717 ms
Cumulative Layout Shift (CLS)0.04
Total Blocking Time (TBT)364 ms
Extra timings
First Contentful Paint (FCP)717 ms
First Paint717 ms
Largest Contentful Paint (LCP)717 ms
Load Event End2.169 s
Fully loaded2.212 s
User Timing marks
mwStartup939 ms
mwCentralNoticeBanner2.011 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 typeP
Element/tag<p></p>
Render time 717 ms
Load time0 ms
Size (width*height)161472
DOM path
div#content > div#bodyContent > div#mw-content-text > div:eq(0) > p:eq(2)> div#content > div#bodyContent > div#mw-content-text > div:eq(0) > p:eq(2)>
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

0.04439 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.

ScoreHTML Element
0.04424<h1 id="firstHeading" class="firstHeading"></h1>,<div id="bodyContent"></div>,<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="en" dir="ltr"></div>
body > div#content > h1#firstHeading,body > div#content > div#bodyContent,body > div#content > div#bodyContent > div#mw-content-text
0.00016
body > div#content > div#siteNotice > div#centralNotice > div:eq(0) > div:eq(1) > center > span > a > #text
Layout shift

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.

Server timings

namedurationdescription
cache0hit-front
host0cp3058

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
Documents13
Frames13
JSEventListeners2065
LayoutObjects27521
MediaKeySessions0
MediaKeys0
Nodes39092
Resources97
ContextLifecycleStateObservers28
V8PerContextDatas1
WorkerGlobalScopes0
UACSSResources0
RTCPeerConnections0
ResourceFetchers13
AdSubframes0
DetachedScriptStates0
ArrayBufferContents0
LayoutCount13
RecalcStyleCount18
LayoutDuration416
RecalcStyleDuration334
DevToolsCommandDuration9
ScriptDuration459
V8CompileDuration6
TaskDuration2154
TaskOtherDuration932
ThreadTime2
ProcessTime3
JSHeapUsedSize5339024
JSHeapTotalSize6602752
FirstMeaningfulPaint717
| Summary | | Largest responses | | Requests and sizes per content type | | Size and requests per domain | | Expires and last modified statistics | | Requests loaded after onLoad event | | 

PageXray

How the page is built.

Summary
HTTP versionHTTP/2.0
Total requests105
Total domains4
Total transfer size1.3 MB
Total content size3.1 MB
Responses missing compression10
Number of cookies3
Third party cookies0
Requests per response code
200105

Largest assets on the page (by transfer size)

URLTypeTransfer SizeContent Size
https://en.wikipedia...wiki/Barack_Obamahtml280.3 KB1.5 MB
https://en.wikipedia...ia.org/w/load.phpjavascript167.9 KB591.5 KB
https://upload.wikim...resident_-_v1.pngimage28.6 KB28.4 KB
https://upload.wikim...llege2008.svg.pngimage27.5 KB27.3 KB
https://upload.wikim...llege2012.svg.pngimage27.4 KB27.3 KB
https://upload.wikim...school_record.jpgimage22.2 KB22.0 KB
https://upload.wikim..._Barack_Obama.jpgimage22.0 KB21.8 KB
https://en.wikipedia...ia.org/w/load.phpjavascript21.4 KB65.8 KB
https://upload.wikim...n_Oval_Office.jpgimage20.5 KB20.3 KB
https://en.wikipedia...ia.org/w/load.phpjavascript19.5 KB75.3 KB
https://upload.wikim...y%2C_2004.svg.pngimage18.6 KB18.5 KB
https://upload.wikim...tatistics.svg.pngimage17.2 KB17.1 KB
https://upload.wikim...eting_2009-11.jpgimage16.9 KB16.7 KB
https://upload.wikim...rora_shooting.jpgimage16.5 KB16.3 KB
https://upload.wikim...secretaries_2.jpgimage16.5 KB16.3 KB
https://upload.wikim...ama-venice-la.jpgimage16.0 KB15.9 KB
https://upload.wikim...portrait_crop.jpgimage15.8 KB15.7 KB
https://upload.wikim...C3%BAl_Castro.jpgimage15.8 KB15.7 KB
https://upload.wikim..._and_children.jpgimage15.5 KB15.3 KB
https://upload.wikim...Office_-_crop.jpgimage15.5 KB15.4 KB

Requests and sizes per content type

ContentHeader SizeTransfer SizeContent SizeRequests
html0 b280.3 KB1.5 MB1
css0 b13.8 KB59.8 KB2
javascript0 b232.5 KB815.0 KB7
image0 b754.2 KB738.3 KB82
svg0 b9.7 KB19.5 KB12
favicon0 b1.2 KB2.7 KB1
Total0 b1.3 MB3.1 MB105

Size and requests per domain

DomainHeader SizeTransfer SizeContent SizeRequests
en.wikipedia.orgN/A543.2 KB2.4 MB21
upload.wikimedia.orgN/A747.2 KB732.7 KB82
login.wikimedia.orgN/A451 B236 B1
meta.wikimedia.orgN/A943 B1.8 KB1

Expires and last modified statistics

typeminmedianmax
Expires0 seconds0 seconds1 year
Last modified42 seconds2 years8 years

Requests loaded after onLoad event

ContentTransfer SizeRequests
html0 b0
css0 b0
javascript19.5 KB1
image0 b0
font0 b0
favicon1.2 KB1
Total20.7 KB2

Requests loaded after onContentLoad

Includes requests done after onLoad.

ContentTransfer SizeRequests
html0 b0
css0 b0
javascript19.5 KB1
image2.7 KB2
font0 b0
svg1.2 KB2
favicon1.2 KB1
Total24.6 KB6
| CPU Long Tasks | CPU Time Spent | CPU Time Spent Per Request | CPU Time Per Tool/Domain | 

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 364
Max Potential First Input Delay 103
Long Tasks before First Paint1329
Long Tasks before First Contentful Paint1329
Long Tasks after Load Event End190
Total Long Tasks121243

Individual Long Tasks

namestartTimedurationcontainerIdcontainerNamecontainerSrccontainerType
unknown357329window
unknown78753window
unknown97060window
unknown106983window
self118964window
self125496window
self1442103window
unknown156092window
self1674100window
self185191window
unknown205782window
self224990window

CPU time spent

Calculated using Tracium.

Categories (ms)
parseHTML117
styleLayout752
paintCompositeRender324
scriptParseCompile6
scriptEvaluation457
garbageCollection50
other467
Events (ms)
RunTask426
Layout416
UpdateLayoutTree336
V8.Execute330
UpdateLayerTree282
ParseHTML115
V8.HandleInterrupts100
Paint30

Time spent per request

URLCPU time (ms)
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.centralNotice.bannerHistoryLogger%2CchoiceData%2Cdisplay%2CgeoIP%2CimpressionDiet%2CkvStore%2ClargeBannerLimit%2ClegacySupport%2CstartUp%7Cext.centralauth.centralautologin%7Cext.cite.ux-enhancements%7Cext.cx.eventlogging.campaigns%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CwikimediaEvents%7Cext.growthExperiments.SuggestedEditSession%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%7Cext.uls.common%2Ccompactlinks%2Cinterface%2Cpreferences%2Cwebfonts%7Cjquery%2Coojs%2Coojs-router%2Csite%7Cjquery.client%2Ccookie%2CembedPlayer%2CmakeCollapsible%2CmwEmbedUtil%2CtextSelection%2CtriggerQueueCallback%7Cjquery.uls.data%7Cmediawiki.String%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Cstorage%2Ctoc%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.editfont.styles%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%7Cmediawiki.ui.button%2Cicon%7Cmmv.bootstrap%2Chead%7Cmmv.bootstrap.autostart%7Cmw.EmbedPlayer.loader%7Cmw.MediaWikiPlayer.loader%7Cmw.MwEmbedSupport%2CPopUpMediaTransform%7Cmw.MwEmbedSupport.style%7Cmw.PopUpMediaTransform.styles%7Cmw.TMHGalleryHook.js%7Cmw.TimedText.loader%7Cskins.vector.legacy.js%7Cuser.defaults&skin=vector&version=9l6ah191
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector165

CPU time spent

Tool/domainTime (ms)
en.wikipedia.org356.6
| First vs third | 

Third party

Third party requests categorised by Third party web.

First party requests and sizes per content type

Calculated using (.*wikipedia.*||.*wikimedia.*) (use --firstParty to configure).

ContentHeader SizeTransfer SizeContent SizeRequests
html0 b280.3 KB1.5 MB1
css0 b13.8 KB59.8 KB2
javascript0 b232.5 KB815.0 KB7
image0 b754.2 KB738.3 KB82
font0 b0 b0 b0
svg0 b9.7 KB19.5 KB12
favicon0 b1.2 KB2.7 KB1
TotalN/A1.3 MB3.1 MB105

Third party requests and sizes per content type

ContentHeader SizeTransfer SizeContent SizeRequests
html0 b0 b0 b0
css0 b0 b0 b0
javascript0 b0 b0 b0
image0 b0 b0 b0
font0 b0 b0 b0
TotalN/AN/AN/A
| afterPageCompleteCheck.png | layoutShift.png | largestContentfulPaint.png | 

Screenshots

afterPageCompleteCheck.png

afterPageCompleteCheck.png

layoutShift.png

layoutShift.png

largestContentfulPaint.png

largestContentfulPaint.png