Page summary

Summary

Metric	Value
Performance Score	78
Total Page Transfer Size	1.2 MB
Requests	101
TTFB [median]	136 ms
Fully Loaded [median]	2.277 s
First Visual Change [median]	535 ms
FCP [median]	535 ms
LCP [median]	535 ms
CLS [median]	0.0448
Total Blocking Time [median]	381 ms
Max Potential FID [median]	144 ms
CPU long tasks [median]	14
CPU longest task duration	256 ms
Speed Index [median]	612 ms
Visual Complete 85% [median]	702 ms
Visual Complete 99% [median]	1.839 s
Last Visual Change [median]	2.240 s

Timings Summary

Waterfall

Run 2 SpeedIndex median

Video

Filmstrip

Use--filmstrip.showAll to show all filmstrips.

0 s

0.3 sCPU Long Task duration 256 ms

0.6 smwStartup 512 msFirst Contentful Paint 535 msLCP <P> 535 msFirst Visual Change 535 ms

0.8 sVisual Complete 85% 702 msVisual Complete 95% 702 ms

0.9 sCPU Long Task duration 58 msCPU Long Task duration 57 ms

1 sCPU Long Task duration 51 ms

1.1 sCPU Long Task duration 58 msCPU Long Task duration 60 ms

1.2 sCPU Long Task duration 150 ms

1.3 s

1.4 sCPU Long Task duration 69 ms

1.5 sCPU Long Task duration 101 ms

1.6 sCPU Long Task duration 63 ms

1.8 sCPU Long Task duration 109 ms

1.9 sVisual Complete 99% 1.839 sDOM Content Loaded Time 1.894 s

2 sPage Load Time 1.908 sCPU Long Task duration 96 ms

2.1 smwCentralNoticeBanner 2.096 s

2.2 sCPU Long Task duration 66 ms

2.3 sLast Visual Change 2.240 sFully Loaded 2.277 sCPU Long Task duration 94 ms

Coach

The coach helps you find performance problems on your web page using web performance best practice rules. And gives you advice on accessibility, privacy and best practices.

Coach score

• Total score 77
• Performance score 78
• Privacy score 86
• Accessibility score 48
• Best practice score 81

Accessibility advice (48)

Show/hide details

Title	Advice	Score
Always use an alt attribute on image tags (altImages)	The page has 41 images that lack alt attribute(s) and 41 of them are unique.The page has 5 images where the alt text are too long (longer than 125 characters).	0
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https://upload.wikimedia.org/wikipedia/commons/thumb/c/cd/Illinois_Senate_Election_Results_by_County%2C_2004.svg/130px-Illinois_Senate_Election_Results_by_County%2C_2004.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/f/f1/BarackObamaportrait.jpg/170px-BarackObamaportrait.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/Lugar-Obama.jpg/220px-Lugar-Obama.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/7/70/Barack_Obama_Iraq_2006.jpg/220px-Barack_Obama_Iraq_2006.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/3/33/P112912PS-0444_-_President_Barack_Obama_and_Mitt_Romney_in_the_Oval_Office_-_crop.jpg/220px-P112912PS-0444_-_President_Barack_Obama_and_Mitt_Romney_in_the_Oval_Office_-_crop.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/3/32/Barack_Obama_addresses_joint_session_of_Congress_2009-02-24.jpg/220px-Barack_Obama_addresses_joint_session_of_Congress_2009-02-24.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/6/63/Obama_cabinet_meeting_2009-11.jpg/220px-Obama_cabinet_meeting_2009-11.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/7/75/Celebrating_a_new_America_-lovewins_58242_%2818588276403%29.jpg/220px-Celebrating_a_new_America_-lovewins_58242_%2818588276403%29.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/f/fc/U.S._Total_Deficits_vs._National_Debt_Increases_2001-2010.png/220px-U.S._Total_Deficits_vs._National_Debt_Increases_2001-2010.png https://upload.wikimedia.org/wikipedia/commons/thumb/2/25/US_Employment_Statistics.svg/300px-US_Employment_Statistics.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/6/63/Obama-venice-la.jpg/220px-Obama-venice-la.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/PPACA_Premium_Chart.jpg/300px-PPACA_Premium_Chart.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/8/84/Percentage_of_Individuals_in_the_United_States_Without_Health_Insurance%2C_1963-2015.png/220px-Percentage_of_Individuals_in_the_United_States_Without_Health_Insurance%2C_1963-2015.png https://upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Barack_Obama_visiting_victims_of_2012_Aurora_shooting.jpg/220px-Barack_Obama_visiting_victims_of_2012_Aurora_shooting.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/9/99/P06409PS-0571_%283594694537%29.jpg/220px-P06409PS-0571_%283594694537%29.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/8/83/Barack_Obama_foreign_trips.svg/220px-Barack_Obama_foreign_trips.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Merkel_an_Obama_Presidential_Medal_of_Freedom.jpg/220px-Merkel_an_Obama_Presidential_Medal_of_Freedom.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/7/76/Barack_Obama_and_Matteo_Renzi_October_2016%2C_1.jpg/220px-Barack_Obama_and_Matteo_Renzi_October_2016%2C_1.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/b/be/David_Cameron_and_Barack_Obama_at_the_G20_Summit_in_Toronto.jpg/220px-David_Cameron_and_Barack_Obama_at_the_G20_Summit_in_Toronto.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Barack_Obama_welcomes_Shimon_Peres_in_the_Oval_Office.jpg/220px-Barack_Obama_welcomes_Shimon_Peres_in_the_Oval_Office.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/f/f7/Vladimir_Putin_and_Barack_Obama_%282015-09-29%29_04.jpg/220px-Vladimir_Putin_and_Barack_Obama_%282015-09-29%29_04.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/a/ac/Obama_and_Biden_await_updates_on_bin_Laden.jpg/220px-Obama_and_Biden_await_updates_on_bin_Laden.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/1/17/Barack_Obama_talks_with_Benjamin_Netanyahu_%288637772147%29.jpg/220px-Barack_Obama_talks_with_Benjamin_Netanyahu_%288637772147%29.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/f/f6/Handshake_between_the_President_and_Cuban_President_Ra%C3%BAl_Castro.jpg/220px-Handshake_between_the_President_and_Cuban_President_Ra%C3%BAl_Castro.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Vladimir_Putin_and_Barack_Obama_%282015-09-29%29_01.jpg/220px-Vladimir_Putin_and_Barack_Obama_%282015-09-29%29_01.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Gallup_Poll-Approval_Rating-Barack_Obama.svg/220px-Gallup_Poll-Approval_Rating-Barack_Obama.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/3/3f/G8_leaders_watching_football.jpg/220px-G8_leaders_watching_football.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/2/2b/58th_Presidential_Inaugural_Ceremony_170120-D-BP749-1327.jpg/220px-58th_Presidential_Inaugural_Ceremony_170120-D-BP749-1327.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/9/96/Obama_Macri_October_2017.jpg/220px-Obama_Macri_October_2017.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/9/9f/Job_Growth_by_U.S._President_-_v1.png/370px-Job_Growth_by_U.S._President_-_v1.png https://upload.wikimedia.org/wikipedia/commons/thumb/2/21/Speaker_Icon.svg/15px-Speaker_Icon.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/5/55/President_Barack_Obama%2C_2012_portrait_crop.jpg/100px-President_Barack_Obama%2C_2012_portrait_crop.jpg https://upload.wikimedia.org/wikipedia/commons/thumb/3/36/Seal_of_the_President_of_the_United_States.svg/85px-Seal_of_the_President_of_the_United_States.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Seal_of_the_United_States_Senate.svg/80px-Seal_of_the_United_States_Senate.svg.png https://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/22px-Commons-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/2/24/Wikinews-logo.svg/30px-Wikinews-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikiquote-logo.svg/25px-Wikiquote-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/29px-Wikisource-logo.svg.png https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Wikidata-logo.svg/30px-Wikidata-logo.svg.png
Always set labels on inputs in forms (labelOnInput)	There are 2 input(s) that are missing labels on a form.	80
<input type="checkbox" class="vectorMenuCheckbox" aria-labelledby="p-variants-label"> <input type="checkbox" class="vectorMenuCheckbox" aria-labelledby="p-cactions-label">
Structure your content by using landmarks (landmarks)	The page doesn't use any landmarks.	0
Use headings tags within section tags to better structure your page (sections)	The page doesn't use sections. You could use them to get a better structure of your content.	0
Use caption and th in tables (table)	The page has tables that are missing caption, please use them to give them a proper heading or summary.	0

Performance advice (78)

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Title	Advice	Score
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
Avoid extra requests by setting cache headers (cacheHeaders)	The page has 79 request(s) that are missing a cache time. Configure a cache time so the browser doesn't need to download them every time. It will save 633.9 kB the next access.	0
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Long cache headers is good (cacheHeadersLong)	The page has 4 request(s) that have a shorter cache time than 30 days (but still a cache time).	96
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.cite.styles%7Cext.tmh.thumbnail.styles%7Cext.uls.interlanguage%7Cext.visualEditor.desktopArticleTarget.noscript%7Cext.wikimediaBadges%7Cjquery.makeCollapsible.styles%7Cmediawiki.toc.styles%7Cskins.vector.styles.legacy%7Cwikibase.client.init&only=styles&skin=vector https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector https://en.wikipedia.org/w/load.php?lang=en&modules=site.styles&only=styles&skin=vector https://en.wikipedia.org/w/load.php?lang=en&modules=Spinner%2Cjquery%2Coojs%2Coojs-router%2Coojs-ui-core%2Coojs-ui-widgets%2Csite%7Cext.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.quicksurveys.init%2Clib%7Cext.tmh.OgvJsSupport%7Cext.uls.common%2Ccompactlinks%2Cinit%2Cinterface%2Cpreferences%2Cwebfonts%7Cjquery.client%2Ccookie%2CembedPlayer%2CloadingSpinner%2CmakeCollapsible%2CmwEmbedUtil%2CtextSelection%2CtriggerQueueCallback%7Cjquery.uls.data%7Cmediawiki.String%2CTitle%2CUri%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Cstorage%2Ctoc%2Cuser%2Cutil%2Cviewport%7Cmediawiki.editfont.styles%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%2Cstartup%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%7Coojs-ui-core.icons%2Cstyles%7Coojs-ui-widgets.icons%7Coojs-ui.styles.indicators%7Cskins.vector.js%7Cuser.defaults&skin=vector&version=1ozc6
Total JavaScript size shouldn't be too big (javascriptSize)	The total JavaScript transfer size is 297.4 kB and the uncompressed size is 1.2 MB. This is totally crazy! There is really room for improvement here.	0
Don't use private headers on static content (privateAssets)	The page has 2 request(s) 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
https://en.wikipedia.org/wiki/Barack_Obama https://login.wikimedia.org/wiki/Special:CentralAutoLogin/checkLoggedIn?type=script&wikiid=enwiki&proto=https

Best practice advice (81)

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Title	Advice	Score
Meta description (metaDescription)	The page is missing a meta description.	0
Avoid Unnecessary Headers (unnecessaryHeaders)	There are 3 response(s) that sets a p3p header. There are 12 response(s) that sets both a max-age and expires header. There are 101 response(s) that sets a server header.	0
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Privacy advice (86)

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

Page info

Page info
Title	Barack Obama - Wikipedia
Generator	MediaWiki 1.35.0-wmf.31
Width	1350
Height	38483
DOM elements	17280
Avg DOM depth	13
Max DOM depth	27
Iframes	0
Script tags	6
Local storage	690.5 KB
Session storage	0 b
HTML vs AMP	Plain good HTML page

Resource Hints
dns-prefetch
https://login.wikimedia.org/
https://meta.wikimedia.org/

Third party
JQuery	3.4.1
Google Analytics	No
Google Tag Manager	No
Piwik	No
Boomerang	No
New Relic	No

Visual Metrics

Browser Metrics

Largest Contentful Paint

Read more about Largest Contentful Paint.

Detected Cumulative Layout Shift

0.04 layout shift collected from the The Layout Instability API.

Element timings

Server timings

Custom metrics collected through JavaScript

There are no custom configured scripts.

Extra metrics collected using scripting

CDP Performance

PageXray

How the page is built.

Largest assets on the page (by transfer size)

Requests and sizes per content type

Size and requests per domain

Expires, last modified and cookies stats

Requests loaded after onLoad event

Requests loaded after onContentLoad

Includes requests done after onLoad.

CPU

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

Long Tasks

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

Individual Long Tasks

CPU time spent

Calculated using Tracium.

Time spent per request

CPU time spent

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).

Third party requests and sizes per content type