Summary for 3 runs https://en.wikipedia.org/wiki/Barack

Summary

Metric	Value
Page metrics
Performance Score	91
Total Page Transfer Size	365.9 KB
Requests	10
Timing metrics
TTFB [median]	122 ms
First Paint [median]	540 ms
Fully Loaded [median]	910 ms
Google Web Vitals
TTFB [median]	122 ms
First Contentful Paint (FCP) [median]	540 ms
Largest Contentful Paint (LCP) [median]	564 ms
Cumulative Layout Shift (CLS) [median]	0.00
Interaction To Next Paint (INP) [median]	136 ms
Total Blocking Time [median]	1.330 s
Max Potential FID [median]	436 ms
CPU metrics
CPU long tasks [median]	13
CPU longest task duration	534 ms
CPU last long task happens at	3.269 s
Visual Metrics
First Visual Change [median]	567 ms
Speed Index [median]	851 ms
Visual Complete 85% [median]	933 ms
Visual Complete 99% [median]	1.200 s
Last Visual Change [median]	3.233 s

Timings Summary

Metric	min	median	mean	max
Visual Metrics
FirstVisualChange	533 ms	567 ms	556 ms	567 ms
LastVisualChange	3.200 s	3.233 s	3.255 s	3.333 s
SpeedIndex	806 ms	851 ms	841 ms	865 ms
Heading	567 ms	567 ms	667 ms	867 ms
LargestContentfulPaint	867 ms	933 ms	922 ms	967 ms
LastMeaningfulPaint	867 ms	933 ms	922 ms	967 ms
VisualReadiness	2.666 s	2.667 s	2.700 s	2.766 s
VisualComplete85	867 ms	933 ms	922 ms	967 ms
VisualComplete95	867 ms	933 ms	922 ms	967 ms
VisualComplete99	1.067 s	1.200 s	1.322 s	1.700 s
Google Web Vitals
Time To First Byte (TTFB)	120 ms	122 ms	121 ms	122 ms
Largest Contentful Paint (LCP)	540 ms	564 ms	657 ms	868 ms
First Contentful Paint (FCP)	512 ms	540 ms	539 ms	564 ms
Cumulative Layout Shift (CLS)	0	0	0	0
More metrics
firstPaint	512 ms	540 ms	539 ms	564 ms
loadEventEnd	1.660 s	1.673 s	1.670 s	1.676 s
User Timing
mwStartup	254 ms	256 ms	256 ms	259 ms
CPU
Total Blocking Time	1.283 s	1.330 s	1.331 s	1.381 s
Max Potential FID	428 ms	436 ms	466 ms	534 ms
CPU long tasks	12	13	13	13
CPU last long task happens at	3.214 s	3.269 s	3.275 s	3.342 s

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| Waterfall | | Download HAR |

Waterfall

Run 2 SpeedIndex median

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| Video | Download |

Video

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| Filmstrip |

Filmstrip

Use--filmstrip.showAll to show all filmstrips.

0 s

0.3 smwStartup 254 msCPU Long Task duration 60 ms

0.5 sCPU Long Task duration 102 ms

0.6 sFirst Contentful Paint 540 msLCP <P> 540 msFirst Visual Change 567 msHeading 567 ms

0.7 s

0.8 s

0.9 sCPU Long Task duration 123 ms

1 sFully Loaded 910 msVisual Complete 85% 933 msVisual Complete 95% 933 msCPU Long Task duration 77 ms

1.1 sCPU Long Task duration 64 ms

1.2 s

1.3 sCPU Long Task duration 346 ms

1.4 s

1.5 s

1.6 sDOM Content Loaded Time 1.543 s

1.7 sPage Load Time 1.676 sVisual Complete 99% 1.700 s

1.8 s

1.9 sCPU Long Task duration 115 ms

2.1 sCPU Long Task duration 534 ms

2.7 sCPU Long Task duration 51 ms

2.8 sCPU Long Task duration 68 ms

2.9 sCPU Long Task duration 293 ms

3.2 sCPU Long Task duration 189 ms

3.4 sLast Visual Change 3.333 sCPU Long Task duration 71 ms

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.

Coach score

Total score 90
Performance score 91
Privacy score 88
Best practice score 90

Performance advice (91)

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

Don't scale images in the browser (avoidScalingImages)

The page has 2 images that are scaled more than 100 pixels. It would be better if those images are sent so the browser don't need to scale them.

Description: It's easy to scale images in the browser and make sure they look good in different devices, however that is bad for performance! Scaling images in the browser takes extra CPU time and will hurt performance on mobile. And the user will download extra kilobytes (sometimes megabytes) of data that could be avoided. Don't do that, make sure you create multiple version of the same image server-side and serve the appropriate one.

Offenders:

https://en.wikipedia.org/static/images/mobile/copyright/wikipedia-wordmark-en.svg

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 13 CPU long tasks with the total of 2.044 s. The total blocking time is 1.330 s and 2 long tasks before first contentful paint with total time of 164 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

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.

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.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%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 21.6 kB (21550) and that is bigger than the limit of 14.5 kB. Try to make the CSS files fit into 14.5 KB.

Description: Make CSS responses small to fit into the magic number TCP window size of 14.5 KB. The browser can then download the CSS faster and that will make the page start rendering earlier.

Offenders:

URL	Transfer size	Content size
https://en.wikipedia.org/w/load.php...ia.org/w/load.php	21.0 KB	154.1 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 7 responses that sets both a max-age and expires header. There are 10 responses that sets a server header.	83
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

Privacy advice (88)

Title	Advice	Score
Use a good Content-Security-Policy header to make sure you you avoid Cross Site Scripting (XSS) attacks. (contentSecurityPolicyHeader)	Set a Content-Security-Policy header to make sure you are not open for Cross Site Scripting (XSS) attacks. You can start with setting a Content-Security-Policy-Report-Only header, that will only report the violation, not stop the download.	0
Description: Content Security Policy is delivered via a HTTP response header, and defines approved sources of content that the browser may load. It can be an effective countermeasure to Cross Site Scripting (XSS) attacks and is also widely supported and usually easily deployed. https://scotthelme.co.uk/content-security-policy-an-introduction/.
Offenders: https://en.wikipedia.org/wiki/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.wikipedia.org/wiki/Barack_Obama

Page info

Page info
Title	Barack Obama - Wikipedia
Generator	MediaWiki 1.45.0-wmf.24
Width	360
Height	6715
DOM elements	13797
Avg DOM depth	14
Max DOM depth	23
Iframes	0
Script tags	7
Local storage	672.4 KB
Session storage	0 b
Network Information API	4g

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.

Technology	Confidence	Category
MediaWiki	100	Wikis
PHP	100	Programming languages
Apache Traffic Server 9.2.11	100	Web servers
HSTS	100	Security

Data from run 2

Visual Metrics

Visual Metrics
First Visual Change	567 ms
Speed Index	851 ms
Heading	567 ms
LargestContentfulPaint	933 ms
Last Meaningful Paint	933 ms
Largest Contentful Paint	933 ms
Visual Complete 85%	933 ms
Visual Complete 95%	933 ms
Visual Complete 99%	1.700 s
Last Visual Change	3.333 s
Visual Readiness	2.766 s

Browser Metrics

Navigation Timing
backEndTime	120 ms
domContentLoadedTime	1.543 s
domInteractiveTime	1.543 s
domainLookupTime	0 ms
frontEndTime	1.347 s
pageDownloadTime	209 ms
pageLoadTime	1.676 s
redirectionTime	0 ms
serverConnectionTime	0 ms
serverResponseTime	324 ms

Google Web Vitals
Time to first byte (TTFB)	120 ms
First Contentful Paint (FCP)	540 ms
Largest Contentful Paint (LCP)	540 ms
Total Blocking Time (TBT)	1.381 s

First Contentful Paint info
Elements that needed recalculate style before FCP	101
Time spent in recalculate style before FCP	47.955 ms

Extra timings
TTFB	120 ms
First Paint	540 ms
Load Event End	1.676 s
Fully loaded	910 ms

User Timing marks
mwStartup	254 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	540 ms
Element render delay	420 ms
TTFB	120 ms
Resource delay	0 ms
Resource load duration	0 ms
Elements that needed recalculate style before LCP	101
Time spent in recalculate style before LCP	47.955 ms
Load time	0 ms
*Size (widthheight)**	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)>

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
487.2 ms	560.4 ms	2.9 ms	2.8 ms	0.1 ms
https://en.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.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cmediawiki.ForeignApi%7Cmediawiki.ForeignApi.core%7Cmediawiki.page.media%7Cmw.cx.SiteMapper&skin=minerva&version=tjtz8
Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 74411
https://en.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.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cmediawiki.ForeignApi%7Cmediawiki.ForeignApi.core%7Cmediawiki.page.media%7Cmw.cx.SiteMapper&skin=minerva&version=tjtz8
Forced Style And Layout Duration: 27 ms Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 74411

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
298.6 ms	360.8 ms	2.3 ms	2.3 ms	0 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 duration	Render duration	PreLayout Duration	Style And Layout Duration
250.6 ms	24.3 ms	284.5 ms	276.8 ms	7.7 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: 33 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
143.3 ms	200.2 ms	3.3 ms	3.1 ms	0.2 ms
https://en.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.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cmediawiki.ForeignApi%7Cmediawiki.ForeignApi.core%7Cmediawiki.page.media%7Cmw.cx.SiteMapper&skin=minerva&version=tjtz8
Forced Style And Layout Duration: 24 ms Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 74411

Blocking duration

Work duration

Render duration

PreLayout Duration

Style And Layout Duration

143.3 ms

200.2 ms

3.3 ms

3.1 ms

0.2 ms

https://en.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.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cmediawiki.ForeignApi%7Cmediawiki.ForeignApi.core%7Cmediawiki.page.media%7Cmw.cx.SiteMapper&skin=minerva&version=tjtz8

Forced Style And Layout Duration: 24 ms

Invoker: TimerHandler:setTimeout
Invoker Type: user-callback
Window attribution: self
Source char position: 74411

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
110.7 ms	115.5 ms	45.2 ms	33 ms	12.2 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
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 duration	Render duration	PreLayout Duration	Style And Layout Duration
73.7 ms	13.2 ms	110.6 ms	0 ms	110.6 ms
No availible script information.

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
60.5 ms	76.5 ms	58.6 ms	39.8 ms	18.8 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.centralauth.ForeignApi%7Cext.cite.ux-enhancements%7Cext.cx.entrypoints.mffrequentlanguages%7Cext.cx.model%7Cext.phonos.init%7Cext.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cmediawiki.ForeignApi%7Cmediawiki.ForeignApi.core%7Cmediawiki.page.media%7Cmw.cx.SiteMapper&skin=minerva&version=tjtz8
Invoker: TimerHandler:setTimeout Invoker Type: user-callback Window attribution: self Source char position: 74411
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 duration	Render duration	PreLayout Duration	Style And Layout Duration
57.3 ms	319.3 ms	0.1 ms	0.1 ms	0 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 duration	Render duration	PreLayout Duration	Style And Layout Duration
44.5 ms	94.5 ms	0 ms	0 ms	0 ms
No availible script information.

Blocking duration	Work duration	Render duration	PreLayout Duration	Style And Layout Duration
39.7 ms	90.7 ms	25 ms	25 ms	0 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

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.

Visual Elements

Name	Display Time	X	Y	Width	Height
LargestImage (250px-President_Barack_Obama.jpg)		55	625	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	567 ms	16	75	328	37
<h1 id="firstHeading" class="firstHeading mw-first-heading"></h1>
LargestContentfulPaint	933 ms	16	312	328	246
<p></p>

PageXray

How the page is built.

Summary
HTTP version	HTTP/2.0
Total requests	10
Total domains	2
Total transfer size	365.9 KB
Total content size	1.7 MB
Responses missing compression	4
Number of cookies	3
Third party cookies	0

Requests per response code
200	10

Largest assets on the page (by transfer size)

URL	Type	Transfer Size	Content Size
https://en.wikipedia...wiki/Barack_Obama	html	234.2 KB	1.3 MB
https://upload.wikim..._Barack_Obama.jpg	image	51.0 KB	49.9 KB
https://en.wikipedia...ia.org/w/load.php	javascript	49.5 KB	173.3 KB
https://en.wikipedia...ia.org/w/load.php	css	21.0 KB	154.1 KB
https://upload.wikim...signature.svg.png	image	4.4 KB	3.3 KB
https://en.wikipedia...ia.org/w/load.php	svg	1.3 KB	707 B
https://en.wikipedia...ia.org/w/load.php	svg	1.2 KB	414 B
https://en.wikipedia...ia.org/w/load.php	svg	1.1 KB	318 B
https://en.wikipedia...ia.org/w/load.php	svg	1.1 KB	326 B
https://en.wikipedia...ia.org/w/load.php	javascript	937 B	62.7 KB

Requests and sizes per content type

Content	Transfer Size	Content Size	Requests
html	234.2 KB	1.3 MB	1
css	21.0 KB	154.1 KB	1
javascript	50.4 KB	236.0 KB	2
image	55.4 KB	53.2 KB	2
svg	4.7 KB	1.7 KB	4
Total	365.9 KB	1.7 MB	10

Data per domain

Domain	Total download time	Transfer Size	Content Size	Requests
en.wikipedia.org	1.205 s	310.4 KB	1.7 MB	8
upload.wikimedia.org	393 ms	55.4 KB	53.2 KB	2

Expires and last modified statistics

type	min	median	max
Expires	0 seconds	2 weeks	4 weeks
Last modified	3 minutes	10 weeks	23 weeks

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.wikipedia...ia.org/w/load.php	non_blocking
https://en.wikipedia...ia.org/w/load.php	blocking
https://en.wikipedia...ia.org/w/load.php	potentially_blocking

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		1381
Max Potential First Input Delay		534
Long Tasks before First Paint	2	162
Long Tasks before First Contentful Paint	2	162
Long Tasks before Largest Contentful Paint	2	162
Long Tasks after Load Event End	7	1321
Total Long Tasks	13	2093

CPU last long task happened at 3.342 s

Individual Long Tasks

name	startTime	duration	containerType
self	254	60	window
unknown	432	102	window
unknown	801	123	window
unknown	978	77	window
self	1058	64	window
self	1265	346	window
self	1845	115	window
self	2086	534	window
self	2635	51	window
self	2712	68	window
self	2805	293	window
self	3108	189	window
self	3342	71	window

CPU time spent

Calculated using Tracium.

Categories (ms)
parseHTML	397
styleLayout	467
paintCompositeRender	68
scriptParseCompile	8
scriptEvaluation	1610
garbageCollection	30
other	1407

Events (ms)
FunctionCall	1417
RunTask	576
CpuProfiler::StartProfiling	540
ParseHTML	377
UpdateLayoutTree	287
Layout	159
DocumentLoader::BodyLoadingFinished	92
DecodedDataDocumentParser::AppendBytes	84
V8.HandleInterrupts	82
v8.run	41
Paint	41
DocumentLoader::CommitNavigation	28
PaintImage	22
PrePaint	20
Layerize	17
v8.produceCache	16
DocumentLoader::BodyDataReceivedImpl	14
ParseAuthorStyleSheet	14
DocumentLoader::FinishedLoading	12
RunMicrotasks	12
V8.BytecodeBudgetInterrupt	11

Time spent per request

URL	CPU time (ms)
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva	1668
https://en.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.relatedArticles.readMore.bootstrap%7Cext.scribunto.logs%7Cext.tmh.OgvJsSupport%2Cplayer%7Cjquery%7Cmediawiki.ForeignApi%7Cmediawiki.ForeignApi.core%7Cmediawiki.page.media%7Cmw.cx.SiteMapper&skin=minerva&version=tjtz8	843
https://en.wikipedia.org/wiki/Barack_Obama	32

Page summary

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

Summary

Timings 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

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

Render blocking requests

Render information

CPU

Long Tasks

Individual Long Tasks

CPU time spent

Time spent per request