https://mediawiki.org
Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
87
GRADE
B
FIX
1
REVIEW
3
PASS
9
INFO
2
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
100
95
100
92
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
491 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
734 ms
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2 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.
531 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.
919 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 sChecks
159 PASS 3 REVIEW 1 FIX
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
Third-Party Impact
Action100% third-party, 0 ms blocking
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (508.9 KiB of 510.2 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
BImage Optimization19 images, 0 KB saveableREVIEW
Image Optimization
19 images, 0 KB saveable
19 images, 0 KB saveable
Info::
All images are well-optimized
19 images 64 KB
0 oversized -0 KB
17 legacy format
0 missing dimensions CLS risk
CJS BundlesAction7 scripts, 158 KB unusedREVIEW
JS Bundles
Action7 scripts, 158 KB unused
7 scripts, 158 KB unused
Warning::
https://www.mediawiki.org/w/load.php?lang=en&modul...: 158 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 158 KB
158 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.mediawiki.org/w/load.php?lang=en&modules=ext.centralNotice.choiceData%2Cdisplay%2CgeoIP%2CimpressionDiet%2CkvStore%2CstartUp%7Cext.centralauth.centralautologin%7Cext.checkUser.clientHints%7Cext.discussionTools.init%2Cminervaicons%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2CtestKitchen%2CwikimediaEvents%7Cext.eventLogging.metricsPlatform%7Cext.parsermigration.survey%7Cext.uls.interface%2Cpreferences%2Cwebfonts%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Cmoment%2Coojs%2Coojs-ui-core%2Coojs-ui-windows%2Crangefix%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.media%2Cready%7Cmediawiki.page.watch.ajax%7Cmmv.bootstrap%2Ccodex%7Coojs-ui-windows.icons%7Cskins.vector.clientPreferences%2Cjs%7Cskins.vector.icons.js%7Cwikibase.client.vector-2022%7Cwikibase.databox.fromWikidata&skin=vector-2022&version=1ij05 | 307 KB | 158 KB (52%) | ✓ | 3rd |
| https://www.mediawiki.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022 | 20 KB | — | ✓ | 3rd |
| https://www.mediawiki.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=1x0mj | 18 KB | — | ✓ | 3rd |
| https://www.mediawiki.org/w/load.php?lang=en&modules=mw.config.values.wbCurrentSiteDetails%2CwbRepo%7Coojs-ui.styles.icons-editing-core&skin=vector-2022&version=ytqu9 | 3 KB | — | ✓ | 3rd |
| https://auth.wikimedia.org/metawiki/wiki/Special:CentralAutoLogin/checkLoggedIn?useformat=desktop&wikiid=mediawikiwiki&usesul3=1&type=script | 1 KB | — | ✓ | 3rd |
| https://www.mediawiki.org/w/load.php?lang=en&modules=mediawiki.action.view.postEdit%7Cmediawiki.notification%2CtempUserCreated%7Coojs-ui.styles.icons-interactions&skin=vector-2022&version=phg48 | 9 KB | — | ✓ | 3rd |
| https://www.mediawiki.org/w/load.php?lang=en&modules=oojs-ui-widgets%7Coojs-ui-widgets.icons&skin=vector-2022&version=1bjas | 18 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
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
A+Page Weight Budget510 KB transferred, 34 requestsPASS
Page Weight Budget
510 KB transferred, 34 requests
510 KB transferred, 34 requests
Info::
Page weighs 2.1 MB (510 KB transferred)
Info::
34 HTTP requests
Info::
Estimated 0.10 g CO2 per page load
510 KB transferred
34 requests
0.10 g CO2 per page load
JavaScript 376.3 KiB 74%
Images 64.1 KiB 13%
CSS 35.9 KiB 7%
HTML 19.4 KiB 4%
Other 14.5 KiB 3%
0 2.4 MB 4.9 MB
Under budget
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+JS Execution Cost337ms total JS executionPASS
JS Execution Cost
337ms total JS execution
337ms total JS execution
Info::
https://www.mediawiki.org/wiki/MediaWiki: 114ms CPU time
Info::
Unattributable: 80ms CPU time
Info::
https://www.mediawiki.org/w/load.php?lang=en&modul...: 75ms CPU time
Info::
https://www.mediawiki.org/w/load.php?lang=en&modul...: 67ms CPU time
Warning::
Third-party scripts: 337ms (100% of total)
Main Thread Breakdown
Script Evaluation 41% Other 21% Style & Layout 19% Script Parsing & Compilation 13% Parse HTML & CSS 4%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.mediawiki.org/wiki/MediaWiki | 114ms | 7ms | 1ms | 3rd |
| Unattributable | 80ms | 2ms | 0ms | 3rd |
| https://www.mediawiki.org/w/load.php?lang=en&modules=ext.centralNotice.choiceData%2Cdisplay%2CgeoIP%2CimpressionDiet%2CkvStore%2CstartUp%7Cext.centralauth.centralautologin%7Cext.checkUser.clientHints%7Cext.discussionTools.init%2Cminervaicons%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2CtestKitchen%2CwikimediaEvents%7Cext.eventLogging.metricsPlatform%7Cext.parsermigration.survey%7Cext.uls.interface%2Cpreferences%2Cwebfonts%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Cmoment%2Coojs%2Coojs-ui-core%2Coojs-ui-windows%2Crangefix%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.media%2Cready%7Cmediawiki.page.watch.ajax%7Cmmv.bootstrap%2Ccodex%7Coojs-ui-windows.icons%7Cskins.vector.clientPreferences%2Cjs%7Cskins.vector.icons.js%7Cwikibase.client.vector-2022%7Cwikibase.databox.fromWikidata&skin=vector-2022&version=1ij05 | 75ms | 26ms | 47ms | 3rd |
| https://www.mediawiki.org/w/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector-2022 | 67ms | 61ms | 2ms | 3rd |
A+Font LoadingNo web fonts (system fonts)PASS
Font Loading
No web fonts (system fonts)
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+Resource CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
A+Resource HintsNo optimization neededPASS
Resource Hints
No optimization needed
No optimization needed
Info::
No resource hint issues
APage Weight Inventory34 resources · 510 KB · 158 KB savings availablePASS
Page Weight Inventory
34 resources · 510 KB · 158 KB savings available
34 resources · 510 KB · 158 KB savings available
Info::
Within 1MB page-weight target
Got: 510 KB
Info::
~158 KB of savings available
Warning::
33 third-party resources (100% of weight)
Info::
1 resources over 200KB
34 resources · 510.2 KiB · 33 third-party Within 1MB page-weight target
JavaScript 74% · 376.3 KiB
Image 14% · 72.3 KiB
CSS 7% · 35.9 KiB
Document 5% · 25.7 KiB
~158.2 KiB of savings available
Remove unused JavaScript: 158.2 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 34 resources | 510.2 KiB | ||||||
AHTTP Cachingmax-age=2592000 (4 weeks)PASS
HTTP Caching
max-age=2592000 (4 weeks)
max-age=2592000 (4 weeks)
Info::
Cache-Control header is set
Got: max-age=2592000
Info::
Effective TTL: 4 weeks (max-age=2592000)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
max-age=2592000
| Directive | Value | Meaning |
|---|---|---|
| max-age | 2592000 | Cache for 4 weeks |
Effective TTL: 2592000 seconds
Network Waterfall34 requests over 439msINFO
Network Waterfall
34 requests over 439ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
100% of JavaScript execution is third-party
First-party Third-party 337ms · 347KB · $1/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.mediawiki.org www.mediawiki.org | Other | 114ms | 19 KB | — | $0/mo | Optional |
Unattributable Unattributable | Other | 80ms | 0 KB | — | $0/mo | Optional |
www.mediawiki.org www.mediawiki.org | Other | 75ms | 307 KB | 52% | $0/mo | Optional |
www.mediawiki.org www.mediawiki.org | Other | 67ms | 20 KB | — | $0/mo | Optional |
www.mediawiki.org
Other
Execution 114ms
Transfer 19 KB
Monthly Cost $0/mo
Unattributable
Other
Execution 80ms
Transfer 0 KB
Monthly Cost $0/mo
www.mediawiki.org
Other
Execution 75ms
Transfer 307 KB
Unused 52%
Monthly Cost $0/mo
www.mediawiki.org
Other
Execution 67ms
Transfer 20 KB
Monthly Cost $0/mo
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
Why this matters
When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.
Learn more ▾ ▴
Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.
Source: web.dev
52% of www.mediawiki.org's code is unused. The script may be loading features you don't use.
Why this matters
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.