Run 4 summary

Summary

Metric	Value
Page metrics
Performance score	99
Total page size	7.5 KB
Requests	2
Timing metrics
TTFB	973 ms
First Paint	1.084 s
Fully Loaded	1.651 s
Google Web Vitals
TTFB	973 ms
First Contentful Paint (FCP)	1.084 s
Largest Contentful Paint (LCP)	1.563 s
Visual Metrics
First Visual Change	1.100 s
Speed Index	1.104 s
Visual Complete 85%	1.100 s
Visual Complete 99%	1.100 s
Last Visual Change	1.600 s

Waterfall

Video

Filmstrip

Use--filmstrip.showAll to show all filmstrips.

0 s

1.1 sDOM Content Loaded Time 1.063 sFirst Contentful Paint 1.084 sFirst Visual Change 1.100 sVisual Complete 85% 1.100 sVisual Complete 95% 1.100 sVisual Complete 99% 1.100 s

1.3 s

1.5 s

1.6 sPage Load Time 1.563 sLCP <IMG> 1.563 sLast Visual Change 1.600 sLargest Image 1.600 sHeading 1.600 s

1.7 sFully Loaded 1.651 s

Coach

The coach helps you find performance problems on your web page using web performance best practice rules. And gives you advice on privacy and best practices. Tested using Coach-core version 8.1.1.

Coach score

• Total score 88
• Performance score 99
• Privacy score 82
• Best practice score 60

Performance advice (99)

Show/hide details

Title	Advice	Score
Have a fast largest contentful paint (largestContentfulPaint)	You can add fetchPriority="high" to the image to increase the load priority in Chrome.	95
Description: Largest contentful paint is one of Google Web Vitals and reports the render time of the largest image or text block visible within the viewport, relative to when the page first started loading. To be fast according to Google, it needs to render before 2.5 seconds and results over 4 seconds is poor performance.
Avoid missing and error requests (responseOk)	The page has 1 error response. The page has 1 response with code 403.	90
Description: Your page should never request assets that return a 400 or 500 error. These requests are never cached. If that happens something is broken. Please fix it.
Offenders: https://en.wikipedia.beta.wmflabs.org/wiki/Barack_Obama

Best practice advice (60)

Show/hide details

Title	Advice	Score
Cumulative Layout Shift (cumulativeLayoutShift)	Layout Shift is not supported in this browser	0
Description: Cumulative Layout Shift measures the sum total of all individual layout shift scores for unexpected layout shift that occur. The metric is measuring visual stability by quantify how often users experience unexpected layout shifts. It is one of Google Web Vitals.
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 too many third party requests (thirdParty)	The page do 50% requests to third party domains (1 requests and 4.6 kB). First party is 1 requests and 3.1 kB. The page transfer more bytes from third party domains (4.6 kB) then first party (3.1 kB). The regex .*wmflabs.* was used to calculate first/third party requests.	0
Description: Do not load most of your content from third party URLs.
Avoid unnecessary headers (unnecessaryHeaders)	There are 1 response that sets both a max-age and expires header. There are 2 responses that sets a server header.	97
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.beta.wmflabs.org/wiki/Barack_Obama https://www.wikimedia.org/static/images/wmf-logo.png https://www.wikimedia.org/static/images/wmf-logo.png

Privacy advice (82)

Show/hide details

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.beta.wmflabs.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.beta.wmflabs.org/wiki/Barack_Obama
Avoid third party cookies that is used to track the user. (thirdPartyCookies)	The page sets 1 third party cookie.	0
Description: Third party cookies are used to track the user. They are automatically blocked in Safari and Firefox.
Offenders: .wikipedia.org

Page info

Page info
Title	Wikimedia Error
Width	1920
Height	995
DOM elements	25
Avg DOM depth	4
Max DOM depth	6
Iframes	0
Script tags	0
Local storage	0 b
Session storage	0 b
Network Information API	unknown

Technologies used to build the page.

Data collected using Wappalyzer version 6.10.66. With updated code from Webappanalyzer 2024-12-27. Use --browsertime.firefox.includeResponseBodies htmlor --browsertime.chrome.includeResponseBodies htmlto help Wappalyzer find more information about technologies used.

Technology	Confidence	Category
Apache Traffic Server 9.2.9	100	Web servers
HSTS	100	Security
HTTP/2	100	Miscellaneous

Visual Metrics

Browser Metrics

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	IMG
Element/tag	<img id="logo" src="https://www.wikimedia.org/static/images/wmf-logo.png" srcset="https://www.wikimedia.org/static/images/wmf-logo-2x.png 2x" alt="Wikimedia" width="135" height="101">
Render time	1.563 s
Element render delay	18 ms
TTFB	973 ms
Resource delay	76 ms
Resource load duration	496 ms
Element id	logo
Load time	1.563 s
URL	https://www.wikimedi...ages/wmf-logo.png
Size (width*height)	13635
DOM path
div:eq(0) > a > img#logo> div:eq(0) > a > img#logo>

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.

The Largest Contentful Paint API highlighted this image as a part of the LCP.

Server timings

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

PageXray

How the page is built.

Largest assets on the page (by transfer size)

Requests and sizes per content type

Data per domain

Expires and last modified statistics

CPU

Screenshots

afterPageCompleteCheck.jpg

largestContentfulPaint.jpg