Performance

· 17 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

Performance

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.

1.11 s

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

1.28 s

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

104 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.

1.24 s

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

3.41 s

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 5 REVIEW 1 FIX

Third-Party Impact

Action

62% third-party, 0 ms blocking

FIX

62% third-party, 0 ms blocking

Third-party code accounts for 62% of page weight (521.8 KiB of 846.0 KiB)

Third-party blocking time is low (0 ms)

38%

62%

First-party Third-party

Image Optimization

29 images, 0 KB saveable

REVIEW

29 images, 0 KB saveable

is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

29 images 534 KB

0 oversized -0 KB

9 legacy format

1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

JS Execution Cost

Action

1036ms total JS execution

REVIEW

1036ms total JS execution

https://en.wikipedia.org/wiki/Main_Page: 458ms CPU time

Unattributable: 280ms CPU time

https://en.wikipedia.org/w/load.php?lang=en&module...: 150ms CPU time

https://en.wikipedia.org/w/load.php?lang=en&module...: 149ms CPU time

Third-party scripts: 280ms (27% of total)

Main Thread Breakdown

Other 30% Script Evaluation 29% Style & Layout 22% Script Parsing & Compilation 8% Rendering 7% Parse HTML & CSS 5%

Script	Total	Scripting	Parse/Compile	Party
https://en.wikipedia.org/wiki/Main_Page	458ms	11ms	5ms	1st
Unattributable	280ms	6ms	0ms	3rd
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.centralNotice.bannerHistoryLogger%2CchoiceData%2Cdisplay%2CgeoIP%2CimpressionDiet%2CkvStore%2ClargeBannerLimit%2ClegacySupport%2CstartUp%7Cext.centralauth.ForeignApi%2Ccentralautologin%7Cext.checkUser.clientHints%7Cext.cx.entrypoints.languagesearcher.init%7Cext.cx.entrypoints.mffrequentlanguages%7Cext.cx.eventlogging.campaigns%7Cext.cx.model%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CtestKitchen%2CwikimediaEvents%7Cext.eventLogging.metricsPlatform%7Cext.growthExperiments.SuggestedEditSession%7Cext.parsermigration.survey%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Coojs%2Csite%7Cjquery.client%2CtextSelection%7Cmediawiki.DateFormatter%2CForeignApi%2CString%2CTitle%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctemplate%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.ForeignApi.core%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax%7Cmediawiki.template.mustache%7Cmobile.codex.styles%7Cmobile.init%2Cstartup%7Cmw.cx.SiteMapper%7Cmw.externalguidance.init%7Cskins.minerva.scripts%7Cwikibase.databox.fromWikidata&skin=minerva&version=ovw68	150ms	65ms	75ms	1st
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva	149ms	125ms	6ms	1st

JS Bundles

5 scripts, 92 KB unused

REVIEW

5 scripts, 92 KB unused

https://en.wikipedia.org/w/load.php?lang=en&module...: 92 KB unused (47%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 92 KB

92 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.ForeignApi%2Ccentralautologin%7Cext.checkUser.clientHints%7Cext.cx.entrypoints.languagesearcher.init%7Cext.cx.entrypoints.mffrequentlanguages%7Cext.cx.eventlogging.campaigns%7Cext.cx.model%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CtestKitchen%2CwikimediaEvents%7Cext.eventLogging.metricsPlatform%7Cext.growthExperiments.SuggestedEditSession%7Cext.parsermigration.survey%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Coojs%2Csite%7Cjquery.client%2CtextSelection%7Cmediawiki.DateFormatter%2CForeignApi%2CString%2CTitle%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctemplate%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.ForeignApi.core%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.ready%7Cmediawiki.page.watch.ajax%7Cmediawiki.template.mustache%7Cmobile.codex.styles%7Cmobile.init%2Cstartup%7Cmw.cx.SiteMapper%7Cmw.externalguidance.init%7Cskins.minerva.scripts%7Cwikibase.databox.fromWikidata&skin=minerva&version=ovw68	197 KB	92 KB (47%)	✓	1st
https://en.wikipedia.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=minerva	22 KB	—	✓	1st
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.gadget.switcher&skin=minerva&version=mygzm	2 KB	—	✓	1st
https://en.wikipedia.org/w/load.php?lang=en&modules=ext.visualEditor.core.utils.parsing%7Cext.visualEditor.targetLoader%2Ctrack%2Cve&skin=minerva&version=sflfg	9 KB	—	✓	1st
https://auth.wikimedia.org/metawiki/wiki/Special:CentralAutoLogin/checkLoggedIn?useformat=mobile&wikiid=enwiki&usesul3=1&type=script	2 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

Page Weight Budget

846 KB transferred, 42 requests

PASS

846 KB transferred, 42 requests

Page weighs 1.7 MB (846 KB transferred)

42 HTTP requests

Estimated 0.17 g CO2 per page load

846 KB transferred

42 requests

0.17 g CO2 per page load

Images 533.9 KiB 63%

JavaScript 230.7 KiB 27%

HTML 49.0 KiB 6%

CSS 21.5 KiB 3%

Other 9.0 KiB 1%

Other 1.8 KiB 0%

0 2.4 MB 4.9 MB

Under budget

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

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

3 hints, 0 missing preconnects

PASS

3 hints, 0 missing preconnects

Page uses 3 resource hint(s)

Current Resource Hints

preconnect

preload

—

dns-prefetch

prefetch

—

3 resource hints configured

Page Weight Inventory

42 resources · 846 KB · 92 KB savings available

PASS

42 resources · 846 KB · 92 KB savings available

Within 1MB page-weight target

Got: 846 KB

~92 KB of savings available

21 third-party resources (62% of weight)

1 resources over 200KB

42 resources · 846.0 KiB · 21 third-party Within 1MB page-weight target

Image 64% · 537.7 KiB

JavaScript 27% · 230.7 KiB

Document 6% · 54.2 KiB

CSS 3% · 21.5 KiB

Other 0% · 1.8 KiB

~91.8 KiB of savings available

Remove unused JavaScript: 91.8 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

42 resources			846.0 KiB

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

Network Waterfall

42 requests over 617ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

27% of JavaScript execution is third-party

First-party Third-party 280ms · 0KB · $1/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	280ms	0 KB	—	$1/mo	Costly

Unattributable

Other

Costly

Execution 280ms

Transfer 0 KB

Monthly Cost $1/mo

These scripts may cost more than they're worth

Unattributable adds 280ms and costs ~$1/month

Unattributable takes 280ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

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.