Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop

100

Performance

100

Accessibility

100

Best Practices

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

327 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

667 ms

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

512 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

667 ms

Page Load Progression

375 ms

750 ms

1.1 s

1.5 s

1.9 s

2.2 s

2.6 s

3.0 s

Checks

9 PASS 4 REVIEW

Image Optimization

27 images, 0 KB saveable

REVIEW

27 images, 0 KB saveable

All images are well-optimized

27 images 248 KB

0 oversized -0 KB

8 legacy format

0 missing dimensions CLS risk

JS Bundles

7 scripts, 87 KB unused

REVIEW

7 scripts, 87 KB unused

https://en.wikipedia.org/w/load.php?lang=en&module...: 87 KB unused (46%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 87 KB

87 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
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.checkUser.clientHints%7Cext.cx.eventlogging.campaigns%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CtestKitchen%2CwikimediaEvents%7Cext.eventLogging.metricsPlatform%7Cext.growthExperiments.SuggestedEditSession%7Cext.parsermigration.survey%7Cext.uls.interface%2Cpreferences%2Cwebfonts%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Coojs%2Csite%7Cjquery.client%2CtextSelection%7Cmediawiki.String%2CTitle%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.editfont.styles%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax%7Cmmv.bootstrap%2Ccodex%7Cskins.vector.clientPreferences%2Cjs%7Cskins.vector.icons.js%7Cwikibase.client.vector-2022%7Cwikibase.databox.fromWikidata&skin=vector-2022&version=wzu8r	192 KB	87 KB (46%)	✓	1st
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022	22 KB	—	✓	1st
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.gadget.ReferenceTooltips%2Cswitcher&skin=vector-2022&version=12w0s	8 KB	—	✓	1st
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.visualEditor.core.utils.parsing%7Cext.visualEditor.desktopArticleTarget.init%7Cext.visualEditor.progressBarWidget%2CsupportCheck%2CtargetLoader%2CtempWikitextEditorWidget%2Ctrack%2Cve&skin=vector-2022&version=1tc3k	18 KB	—	✓	1st
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.centralauth.ForeignApi%7Cext.cite.referencePreviews%7Cext.math.popup%7Cext.popups.main%7Cmediawiki.ForeignApi%7Cmediawiki.ForeignApi.core&skin=vector-2022&version=j13ql	27 KB	—	✓	1st
https://en.wikipedia.org/w/load.php?lang=en&modules=mw.config.values.wbCurrentSiteDetails%2CwbRepo%7Coojs-ui.styles.icons-editing-core&skin=vector-2022&version=1vhnp	3 KB	—	✓	1st
https://auth.wikimedia.org/metawiki/wiki/Special:CentralAutoLogin/checkLoggedIn?useformat=desktop&wikiid=enwiki&usesul3=1&type=script	1 KB	—	✓	3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

HTTP Caching

s-maxage=1200, must-revalidate, max-age=0

REVIEW

s-maxage=1200, must-revalidate, max-age=0

Cache-Control header is set

Got: s-maxage=1200, must-revalidate, max-age=0

CDN TTL: 20 minutes (s-maxage=1200)

Last-Modified header present

Cache-Control

s-maxage=1200, must-revalidate, max-age=0

Directive	Value	Meaning
s-maxage	1200	CDN caches for 20 minutes
must-revalidate	—	Must recheck with server after expiry
max-age	0	Cache for 0 seconds

A+

Page Weight Budget

602 KB transferred, 41 requests

PASS

602 KB transferred, 41 requests

Page weighs 1.8 MB (602 KB transferred)

41 HTTP requests

Estimated 0.12 g CO2 per page load

602 KB transferred

41 requests

0.12 g CO2 per page load

JavaScript 270.9 KiB 45%

Images 247.8 KiB 41%

HTML 51.3 KiB 9%

CSS 25.0 KiB 4%

Other 7.0 KiB 1%

0 2.4 MB 4.9 MB

Under budget

Third-Party Impact

31% third-party, 0 ms blocking

PASS

31% third-party, 0 ms blocking

Third-party code accounts for 31% of page weight (184.3 KiB of 602.0 KiB)

Third-party blocking time is low (0 ms)

69%

31%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

JS Execution Cost

183ms total JS execution

PASS

183ms total JS execution

https://en.wikipedia.org/wiki/Main_Page: 109ms CPU time

Unattributable: 74ms CPU time

Third-party scripts: 74ms (41% of total)

Main Thread Breakdown

Script Evaluation 37% Other 26% Style & Layout 20% Script Parsing & Compilation 8% Rendering 5% Parse HTML & CSS 4%

Script	Total	Scripting	Parse/Compile	Party
https://en.wikipedia.org/wiki/Main_Page	109ms	5ms	1ms	1st
Unattributable	74ms	2ms	0ms	3rd

A+

Font Loading

No web fonts (system fonts)

PASS

No web fonts (system fonts)

No web fonts loaded — system fonts are fastest

No web fonts loaded — system fonts are optimal.

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

A+

Page Weight Inventory

41 resources · 602 KB · 87 KB savings available

PASS

41 resources · 602 KB · 87 KB savings available

Within 1MB page-weight target

Got: 602 KB

~87 KB of savings available

21 third-party resources (31% of weight)

41 resources · 602.0 KiB · 21 third-party Within 1MB page-weight target

JavaScript 45% · 270.9 KiB

Image 41% · 249.6 KiB

Document 9% · 56.5 KiB

CSS 4% · 25.0 KiB

~86.7 KiB of savings available

Remove unused JavaScript: 86.7 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

41 resources			602.0 KiB

Network Waterfall

41 requests over 533ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

41% of JavaScript execution is third-party

First-party Third-party 74ms · 0KB · $0/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	74ms	0 KB	—	$0/mo	Optional

Unattributable

Other

Optional

Execution 74ms

Transfer 0 KB

Monthly Cost $0/mo

41% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.