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Lighthouse Desktop

· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
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Detailed Report

Audit breakdown by category with detailed findings.

82

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
upload.wikimedia.org/wikipedia/donate/7/75/Caveat-brush-v6-latin-regular.woff20.0 ms67.1 KiB
/wikipedia/commons/thumb/f/f2/Hapalochlaena_lunulata2.JPG...0.0 ms43.1 KiB
/wikipedia/commons/thumb/9/9c/Tremoctopus_violaceus5.jpg/...0.0 ms37.2 KiB
/wikipedia/commons/thumb/7/70/Octopus_vulgaris_Cuvier,_17...0.0 ms33.2 KiB
/wikipedia/commons/thumb/1/1e/AMI_-_Oktopusvase.jpg/250px...0.0 ms29.9 KiB
/wikipedia/commons/thumb/e/ed/Octopus_cyaneain_Kona.jpg/2...0.0 ms29.1 KiB
/wikipedia/commons/thumb/7/7d/Snails-Italy.jpg/250px-Snai...0.0 ms28.2 KiB
/wikipedia/commons/thumb/f/f1/Veined_Octopus_-_Amphioctop...0.0 ms26.4 KiB
/wikipedia/commons/thumb/a/a4/Oktopus_opening_a_container...0.0 ms25.1 KiB
/wikipedia/commons/thumb/b/b4/Cirroteuthis_muelleri_NOAA....0.0 ms23.6 KiB
/wikipedia/commons/9/9d/Colossal_octopus_by_Pierre_Denys_...0.0 ms23.2 KiB
/w/load.php?lang=en&modules=ext.cite.styles%7Cext.tmh.pla...300.0 s24.0 KiB
/wikipedia/commons/thumb/5/57/Octopus2.jpg/250px-Octopus2...0.0 ms21.5 KiB
/w/load.php?lang=en&modules=startup&only=scripts&raw=1&sk...300.0 s22.1 KiB
/wikipedia/commons/thumb/e/ea/Schematic_lateral_aspect_of...0.0 ms20.9 KiB
/wikipedia/commons/thumb/5/50/Reef1072_-_Flickr_-_NOAA_Ph...0.0 ms20.0 KiB
/wikipedia/commons/thumb/3/33/Octopus3.jpg/250px-Octopus3...0.0 ms19.9 KiB
/wikipedia/commons/thumb/7/7d/OCTOPUS_arm1.JPG/250px-OCTO...0.0 ms18.5 KiB
/wikipedia/commons/thumb/f/f4/Moving_Octopus_Vulgaris_200...0.0 ms17.2 KiB
/wikipedia/commons/thumb/c/cf/North_Pacific_Giant_Octopus...0.0 ms16.6 KiB
/wikipedia/commons/thumb/2/29/Muensterella_scutellaris_34...0.0 ms15.1 KiB
upload.wikimedia.org/wikipedia/donate/b/be/Trustly_logos_only.png0.0 ms14.2 KiB
/wikipedia/commons/thumb/3/39/Enteroctopus_dofleini_to_sp...0.0 ms13.2 KiB
/wikipedia/commons/thumb/e/ef/Tako_nigiri_2.jpg/250px-Tak...0.0 ms12.8 KiB
/wikipedia/commons/thumb/1/14/Octopus.ogv/250px--Octopus....0.0 ms12.5 KiB
/wikipedia/commons/thumb/3/3d/Fish3566_-_Flickr_-_NOAA_Ph...0.0 ms12.1 KiB
/wikipedia/commons/thumb/b/b0/Dumbo-hires_(cropped).jpg/2...0.0 ms11.9 KiB
/wikipedia/commons/thumb/a/a3/Atlantic_cod.jpg/250px-Atla...0.0 ms9.1 KiB
/wikipedia/commons/thumb/3/32/Octopus_vulgaris_Merculiano...0.0 ms8.7 KiB
/wikipedia/commons/thumb/1/10/Nautilus_belauensis_profile...0.0 ms7.3 KiB
/wikipedia/commons/thumb/3/3d/Pacific_oysters_01.jpg/120p...0.0 ms6.5 KiB
/wikipedia/commons/thumb/8/8c/Lobster_(PSF).png/120px-Lob...0.0 ms6.0 KiB
/wikipedia/commons/thumb/9/93/Berryteuthis_magister.jpg/1...0.0 ms5.2 KiB
/wikipedia/commons/thumb/6/64/Vampyroteuthis_infernalis.j...0.0 ms5.1 KiB
/wikipedia/commons/thumb/3/34/Amphitretus_pelagicus.jpg/1...0.0 ms5.0 KiB
/wikipedia/commons/thumb/6/61/Bathypolypus_valdiviae.jpg/...0.0 ms4.9 KiB
/wikipedia/commons/thumb/e/e4/Eledonella_pygmaea.jpg/120p...0.0 ms4.4 KiB
/wikipedia/commons/thumb/a/a0/Eledone_cirrhosa1.jpg/120px...0.0 ms4.3 KiB
/wikipedia/commons/thumb/3/32/Octopus_vulgaris_Merculiano...0.0 ms4.1 KiB
/wikipedia/commons/thumb/f/f9/Stauroteuthis_syrtensis_(ma...0.0 ms3.5 KiB
/wikipedia/commons/thumb/0/09/Ocythoe_tuberculata_(Mercul...0.0 ms3.4 KiB
/wikipedia/commons/thumb/9/9b/Haliphron_atlanticus_(70_mm...0.0 ms3.2 KiB
/wikipedia/commons/thumb/8/82/E_zealandicus_(white_backgr...0.0 ms3.2 KiB
/w/load.php?lang=en&modules=site.styles&only=styles&skin=...300.0 s3.2 KiB
/wikipedia/commons/thumb/9/91/Vitreledonella_richardi_(wh...0.0 ms2.9 KiB
/wikipedia/commons/thumb/f/fa/Wikibooks-logo.svg/40px-Wik...0.0 ms2.8 KiB
/wikipedia/commons/thumb/1/1f/Cirroctopus_mawsoni_Vent.jp...0.0 ms2.8 KiB
/wikipedia/commons/thumb/c/c7/Opisthoteuthis_californiana...0.0 ms2.8 KiB
/wikipedia/commons/thumb/0/0a/Graneledone_boreopacifica_(...0.0 ms2.7 KiB
/wikipedia/commons/thumb/a/a1/Argonauta_argo_Merculiano.j...0.0 ms2.7 KiB
/wikipedia/commons/thumb/4/4a/Pelagic_octopus_Tremoctopus...0.0 ms2.6 KiB
/wikipedia/commons/thumb/8/88/CirrothaumaMurDraw2.jpg/40p...0.0 ms2.3 KiB
/wikipedia/en/thumb/4/4a/Commons-logo.svg/40px-Commons-lo...0.0 ms2.2 KiB
upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg0.0 ms2.0 KiB
/wikipedia/en/thumb/e/e7/Cscr-featured.svg/20px-Cscr-feat...0.0 ms1.9 KiB
/wikipedia/en/thumb/1/1b/Semi-protection-shackle.svg/20px...0.0 ms1.4 KiB
upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg0.0 ms1.4 KiB
upload.wikimedia.org/wikipedia/commons/4/4d/Icon_pdf_file.png0.0 ms1.3 KiB
/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressiv...0.0 ms1.3 KiB
/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr.svg/2...0.0 ms1.2 KiB

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.366636] map[node:map[boundingRect:map[bottom:25940 height:25259 left:264 right:1306 top:681 width:1042] lhId:page-11-DIV nodeLabel:Octopus 112 languages Article Talk Read View source View history Tools Appearan… path:1,HTML,1,BODY,3,DIV,0,DIV,2,DIV selector:body.skin--responsive > div.mw-page-container > div.mw-page-container-inner > div.mw-content-container snippet:<div class="mw-content-container"> type:node] score:0.365763] map[node:map[boundingRect:map[bottom:1155 height:137 left:1126 right:1290 top:1018 width:164] lhId:page-6-DIV nodeLabel:Color Automatic Light Dark path:1,HTML,1,BODY,3,DIV,0,DIV,2,DIV,0,MAIN,2,DIV,0,DIV,2,NAV,0,DIV,0,DIV,3,DIV selector:nav.vector-appearance-landmark > div#vector-appearance-pinned-container > div#vector-appearance > div#skin-client-prefs-skin-theme snippet:<div class="mw-portlet mw-portlet-skin-client-prefs-skin-theme vector-menu" id="skin-client-prefs-skin-theme"> type:node] score:0.000871] map[node:map[boundingRect:map[bottom:854 height:12 left:42 right:54 top:842 width:12] lhId:page-1-SPAN nodeLabel:ul#mw-panel-toc-list > li#toc-Anatomy_and_physiology > button.cdx-button > span.vector-icon path:1,HTML,1,BODY,3,DIV,0,DIV,1,DIV,1,DIV,0,NAV,0,DIV,0,DIV,1,UL,2,LI,1,BUTTON,0,SPAN selector:ul#mw-panel-toc-list > li#toc-Anatomy_and_physiology > button.cdx-button > span.vector-icon snippet:<span class="vector-icon mw-ui-icon-wikimedia-expand"> type:node] score:2e-06]]

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLEst Savings
upload.wikimedia.org/wikipedia/donate/7/75/Caveat-brush-v6-latin-regular.woff280 ms

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:37.283 source:map[column:636 line:459 type:source-location url: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.cite.ux-enhancements%7Cext.cx.eventlogging.campaigns%7Cext.cx.model%7Cext.cx.uls.quick.actions%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CtestKitchen%2CwikimediaEvents%7Cext.eventLogging.metricsPlatform%7Cext.growthExperiments.SuggestedEditSession%7Cext.parsermigration.survey%7Cext.quicksurveys.init%2Clib%7Cext.tmh.OgvJsSupport%2Cplayer%7Cext.uls.common%2Cinterface%2Cpreferences%2Cwebfonts%7Cext.uls.rewrite.entrypoints%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Coojs%2Csite%7Cjquery.client%2CmakeCollapsible%2Cspinner%2CtextSelection%7Cjquery.spinner.styles%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctoc%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.media%2Cready%7Cmediawiki.page.watch.ajax%7Cmmv.bootstrap%2Ccodex%7Cmw.cx.SiteMapper%7Cskins.vector.clientPreferences%2Cjs%7Cskins.vector.icons.js%7Cwikibase.client.vector-2022%7Cwikibase.databox.fromWikidata&skin=vector-2022&version=1do71 urlProvider:network]]]
headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:44.884 source:map[type:text value:[unattributed]]] map[reflowTime:20.031 source:map[column:872 line:495 type:source-location url: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.cite.ux-enhancements%7Cext.cx.eventlogging.campaigns%7Cext.cx.model%7Cext.cx.uls.quick.actions%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CtestKitchen%2CwikimediaEvents%7Cext.eventLogging.metricsPlatform%7Cext.growthExperiments.SuggestedEditSession%7Cext.parsermigration.survey%7Cext.quicksurveys.init%2Clib%7Cext.tmh.OgvJsSupport%2Cplayer%7Cext.uls.common%2Cinterface%2Cpreferences%2Cwebfonts%7Cext.uls.rewrite.entrypoints%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Coojs%2Csite%7Cjquery.client%2CmakeCollapsible%2Cspinner%2CtextSelection%7Cjquery.spinner.styles%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctoc%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.media%2Cready%7Cmediawiki.page.watch.ajax%7Cmmv.bootstrap%2Ccodex%7Cmw.cx.SiteMapper%7Cskins.vector.clientPreferences%2Cjs%7Cskins.vector.icons.js%7Cwikibase.client.vector-2022%7Cwikibase.databox.fromWikidata&skin=vector-2022&version=1do71 urlProvider:network]] map[reflowTime:0.24 source:map[column:206 line:501 type:source-location url: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.cite.ux-enhancements%7Cext.cx.eventlogging.campaigns%7Cext.cx.model%7Cext.cx.uls.quick.actions%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CtestKitchen%2CwikimediaEvents%7Cext.eventLogging.metricsPlatform%7Cext.growthExperiments.SuggestedEditSession%7Cext.parsermigration.survey%7Cext.quicksurveys.init%2Clib%7Cext.tmh.OgvJsSupport%2Cplayer%7Cext.uls.common%2Cinterface%2Cpreferences%2Cwebfonts%7Cext.uls.rewrite.entrypoints%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Coojs%2Csite%7Cjquery.client%2CmakeCollapsible%2Cspinner%2CtextSelection%7Cjquery.spinner.styles%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctoc%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.media%2Cready%7Cmediawiki.page.watch.ajax%7Cmmv.bootstrap%2Ccodex%7Cmw.cx.SiteMapper%7Cskins.vector.clientPreferences%2Cjs%7Cskins.vector.icons.js%7Cwikibase.client.vector-2022%7Cwikibase.databox.fromWikidata&skin=vector-2022&version=1do71 urlProvider:network]] map[reflowTime:7.681 source:map[column:904 line:495 type:source-location url: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.cite.ux-enhancements%7Cext.cx.eventlogging.campaigns%7Cext.cx.model%7Cext.cx.uls.quick.actions%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CtestKitchen%2CwikimediaEvents%7Cext.eventLogging.metricsPlatform%7Cext.growthExperiments.SuggestedEditSession%7Cext.parsermigration.survey%7Cext.quicksurveys.init%2Clib%7Cext.tmh.OgvJsSupport%2Cplayer%7Cext.uls.common%2Cinterface%2Cpreferences%2Cwebfonts%7Cext.uls.rewrite.entrypoints%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Coojs%2Csite%7Cjquery.client%2CmakeCollapsible%2Cspinner%2CtextSelection%7Cjquery.spinner.styles%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctoc%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.media%2Cready%7Cmediawiki.page.watch.ajax%7Cmmv.bootstrap%2Ccodex%7Cmw.cx.SiteMapper%7Cskins.vector.clientPreferences%2Cjs%7Cskins.vector.icons.js%7Cwikibase.client.vector-2022%7Cwikibase.databox.fromWikidata&skin=vector-2022&version=1do71 urlProvider:network]] map[reflowTime:0.465 source:map[column:509 line:495 type:source-location url: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.cite.ux-enhancements%7Cext.cx.eventlogging.campaigns%7Cext.cx.model%7Cext.cx.uls.quick.actions%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CtestKitchen%2CwikimediaEvents%7Cext.eventLogging.metricsPlatform%7Cext.growthExperiments.SuggestedEditSession%7Cext.parsermigration.survey%7Cext.quicksurveys.init%2Clib%7Cext.tmh.OgvJsSupport%2Cplayer%7Cext.uls.common%2Cinterface%2Cpreferences%2Cwebfonts%7Cext.uls.rewrite.entrypoints%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Coojs%2Csite%7Cjquery.client%2CmakeCollapsible%2Cspinner%2CtextSelection%7Cjquery.spinner.styles%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctoc%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.media%2Cready%7Cmediawiki.page.watch.ajax%7Cmmv.bootstrap%2Ccodex%7Cmw.cx.SiteMapper%7Cskins.vector.clientPreferences%2Cjs%7Cskins.vector.icons.js%7Cwikibase.client.vector-2022%7Cwikibase.databox.fromWikidata&skin=vector-2022&version=1do71 urlProvider:network]] map[reflowTime:8.866 source:map[column:17 line:548 type:source-location url: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.cite.ux-enhancements%7Cext.cx.eventlogging.campaigns%7Cext.cx.model%7Cext.cx.uls.quick.actions%7Cext.echo.centralauth%7Cext.eventLogging%2CnavigationTiming%2Cpopups%2CtestKitchen%2CwikimediaEvents%7Cext.eventLogging.metricsPlatform%7Cext.growthExperiments.SuggestedEditSession%7Cext.parsermigration.survey%7Cext.quicksurveys.init%2Clib%7Cext.tmh.OgvJsSupport%2Cplayer%7Cext.uls.common%2Cinterface%2Cpreferences%2Cwebfonts%7Cext.uls.rewrite.entrypoints%7Cext.urlShortener.toolbar%7Cext.wikimediaEvents.testKitchen%7Cjquery%2Coojs%2Csite%7Cjquery.client%2CmakeCollapsible%2Cspinner%2CtextSelection%7Cjquery.spinner.styles%7Cjquery.uls.data%7Cmediawiki.ForeignApi%2CString%2CTitle%2Capi%2Cbase%2Ccldr%2Ccookie%2Cexperiments%2CjqueryMsg%2Clanguage%2Crouter%2Cstorage%2Ctoc%2Cuser%2Cutil%2CvisibleTimeout%7Cmediawiki.ForeignApi.core%7Cmediawiki.editfont.styles%7Cmediawiki.libs.pluralruleparser%7Cmediawiki.page.media%2Cready%7Cmediawiki.page.watch.ajax%7Cmmv.bootstrap%2Ccodex%7Cmw.cx.SiteMapper%7Cskins.vector.clientPreferences%2Cjs%7Cskins.vector.icons.js%7Cwikibase.client.vector-2022%7Cwikibase.databox.fromWikidata&skin=vector-2022&version=1do71 urlProvider:network]]]

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates
value: No additional origins are good candidates for preconnecting

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
Common octopus on seabed td > span.mw-default-size > a.mw-file-description > img.mw-file-element
/wikipedia/commons/thumb/5/57/Octopus2.jpg/250px-Octopus2...20.4 KiB12.7 KiB
figure.mw-default-size > span > span.mw-tmh-player > video#mwe_player_0_placeholder figure.mw-default-size > span > span.mw-tmh-player > video#mwe_player_0_placeholder
/wikipedia/commons/thumb/f/f4/Moving_Octopus_Vulgaris_200...16.1 KiB8.5 KiB

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
/w/load.php?lang=en&modules=site.styles&only=styles&skin=...3.2 KiB
/w/load.php?lang=en&modules=ext.cite.styles%7Cext.tmh.pla...24.0 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Diagnostics

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 2.2 KiB
URLTransfer SizeEst Savings
/* css variables */ .frb { color-scheme: normal; color-scheme: light; --wmui-base100: #fff; …10.5 KiB2.2 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 50.5 KiB
URLTransfer SizeEst Savings
.mw-spinner{position:relative; } …21.2 KiB20.0 KiB
/w/load.php?lang=en&modules=ext.cite.styles%7Cext.tmh.pla...23.0 KiB17.4 KiB
.oo-ui-icon-edit,.mw-ui-icon-edit:before{background-image:url("data:image/svg+xml,%3Csvg xmlns=%22ht… } …13.5 KiB13.1 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 81.6 KiB
URLTransfer SizeEst Savings
/w/load.php?lang=en&modules=ext.centralNotice.bannerHisto...227.8 KiB81.6 KiB

More information about the performance of your application. These numbers don't directly affect the Performance score.

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

ElementLayout shift score
Octopus 112 languages Article Talk Read View source View history Tools Appearan… body.skin--responsive > div.mw-page-container > div.mw-page-container-inner > div.mw-content-container
0.366
Color Automatic Light Dark nav.vector-appearance-landmark > div#vector-appearance-pinned-container > div#vector-appearance > div#skin-client-prefs-skin-theme
0.001
ul#mw-panel-toc-list > li#toc-Anatomy_and_physiology > button.cdx-button > span.vector-icon ul#mw-panel-toc-list > li#toc-Anatomy_and_physiology > button.cdx-button > span.vector-icon
0.000
●Document request latency
●Optimize DOM size
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Time to Interactive 0.7 s
●Max Potential First Input Delay 50 ms
●Minify JavaScript
●Avoids enormous network payloads Total size was 1,307 KiB
●User Timing marks and measures 2 user timings
●JavaScript execution time 0.2 s
●Minimizes main-thread work 1.0 s
●Avoid long main-thread tasks 1 long task found
●Image elements have explicit `width` and `height`
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 30 ms
●Server Backend Latencies 110 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Avoid multiple page redirects
●Initial server response time was short Root document took 30 ms
○INP breakdown
○LCP request discovery
○Avoid non-composited animations
83

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Middle Jurassic div > span.noprint > span > a
Scientific classification tbody > tr > th > a
Synonyms tbody > tr > th > a
show tr > th.navbox-title > button.mw-collapsible-toggle > span.mw-collapsible-text
fishery tr > th.navbox-title > div#Principal_commercial_fishery_species_groups4602 > a
show tr > th.navbox-title > button.mw-collapsible-toggle > span.mw-collapsible-text
mollusks tr > th.navbox-title > div#Commercial_mollusks1570 > a
show tr > th.navbox-title > button.mw-collapsible-toggle > span.mw-collapsible-text
Taxon identifiers tr > th.navbox-title > div#Taxon_identifiers3213 > a
show tr > th.navbox-title > button.mw-collapsible-toggle > span.mw-collapsible-text
Authority control databases tr > th.navbox-title > div#Authority_control_databases_frameless&#124;text-top&#124;10px&#124;alt=Edit_this_at_Wikidata&#124;link=https&#58;//www.wikidata.org/wiki/Q40152#identifiers&#124;class=noprint&#124;Edit_this_at_Wikidata1495 > a

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
gonoduct div#mw-content-text > div.mw-content-ltr > p > a.new

These are opportunities to improve the legibility of your content.

Names and labels

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
div.mw-content-ltr > figure.mw-default-size > a.mw-file-description > img.mw-file-element div.mw-content-ltr > figure.mw-default-size > a.mw-file-description > img.mw-file-element
div.mw-content-ltr > figure.mw-default-size > a.mw-file-description > img.mw-file-element div.mw-content-ltr > figure.mw-default-size > a.mw-file-description > img.mw-file-element

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div#mw-content-text > div.mw-content-ltr > figure.mw-default-size > a.mw-file-magnify div#mw-content-text > div.mw-content-ltr > figure.mw-default-size > a.mw-file-magnify
div#mw-content-text > div.mw-content-ltr > figure.mw-default-size > a.mw-file-magnify div#mw-content-text > div.mw-content-ltr > figure.mw-default-size > a.mw-file-magnify
td.clade-leaf > p > span > a.mw-file-description td.clade-leaf > p > span > a.mw-file-description
td.clade-leaf > p > span > a.mw-file-description td.clade-leaf > p > span > a.mw-file-description
td.clade-leaf > p > span > a.mw-file-description td.clade-leaf > p > span > a.mw-file-description
td.clade-leaf > p > span > a.mw-file-description td.clade-leaf > p > span > a.mw-file-description
td.clade-leaf > p > span > a.mw-file-description td.clade-leaf > p > span > a.mw-file-description
td.clade-leaf > p > span > a.mw-file-description td.clade-leaf > p > span > a.mw-file-description
td.clade-leaf > p > span > a.mw-file-description td.clade-leaf > p > span > a.mw-file-description
td.clade-leaf > p > span > a.mw-file-description td.clade-leaf > p > span > a.mw-file-description
td.clade-leaf > p > span > a.mw-file-description td.clade-leaf > p > span > a.mw-file-description
td.clade-leaf > p > span > a.mw-file-description td.clade-leaf > p > span > a.mw-file-description
td.clade-leaf > p > span > a.mw-file-description td.clade-leaf > p > span > a.mw-file-description
td.clade-leaf > p > span > a.mw-file-description td.clade-leaf > p > span > a.mw-file-description
td.clade-leaf > p > span > a.mw-file-description td.clade-leaf > p > span > a.mw-file-description
td.clade-leaf > p > span > a.mw-file-description td.clade-leaf > p > span > a.mw-file-description
td.clade-leaf > p > span > a.mw-file-description td.clade-leaf > p > span > a.mw-file-description
td.clade-leaf > p > span > a.mw-file-description td.clade-leaf > p > span > a.mw-file-description
div#mw-content-text > div.mw-content-ltr > figure.mw-default-size > a.mw-file-description div#mw-content-text > div.mw-content-ltr > figure.mw-default-size > a.mw-file-description
div#mw-content-text > div.mw-content-ltr > figure.mw-default-size > a.mw-file-description div#mw-content-text > div.mw-content-ltr > figure.mw-default-size > a.mw-file-description

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Ꞓ span.noprint > div#Timeline-row > div > a
O span.noprint > div#Timeline-row > div > a
S span.noprint > div#Timeline-row > div > a
D span.noprint > div#Timeline-row > div > a
C span.noprint > div#Timeline-row > div > a
P span.noprint > div#Timeline-row > div > a
T span.noprint > div#Timeline-row > div > a
J span.noprint > div#Timeline-row > div > a
Pg span.noprint > div#Timeline-row > div > a
N span.noprint > div#Timeline-row > div > a
v div.navbar > ul > li.nv-view > a
t div.navbar > ul > li.nv-talk > a
e div.navbar > ul > li.nv-edit > a
v div.navbar > ul > li.nv-view > a
t div.navbar > ul > li.nv-talk > a
e div.navbar > ul > li.nv-edit > a
v div.navbar > ul > li.nv-view > a
t div.navbar > ul > li.nv-talk > a
e div.navbar > ul > li.nv-edit > a
Edit this at Wikidata th.navbox-title > div#Authority_control_databases_frameless&#124;text-top&#124;10px&#124;alt=Edit_this_at_Wikidata&#124;link=https&#58;//www.wikidata.org/wiki/Q40152#identifiers&#124;class=noprint&#124;Edit_this_at_Wikidata1495 > span.mw-valign-text-top > a

These items highlight common accessibility best practices.

Screen readers have features to make navigating tables easier. Ensuring that tables use the actual caption element instead of cells with the `[colspan]` attribute may improve the experience for screen reader users. Learn more about captions.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Octopus Temporal range: Middle Jurassic – recent PreꞒ Ꞓ O S D C P T J K Pg N … div#bodyContent > div#mw-content-text > div.mw-content-ltr > table.infobox
show vte Principal commercial fishery species groups div#mw-content-text > div.mw-content-ltr > div.navbox > table.nowraplinks
show vte Commercial mollusks div#mw-content-text > div.mw-content-ltr > div.navbox > table.nowraplinks
show vte Edible molluscs div#mw-content-text > div.mw-content-ltr > div.navbox > table.nowraplinks
Taxon identifiers Octopoda Wikidata: Q40152Wikispecies: OctopodaADW: Octopoda… div#mw-content-text > div.mw-content-ltr > div.navbox > table.nowraplinks
show Authority control databases div#mw-content-text > div.mw-content-ltr > div.navbox > table.nowraplinks
○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●Form elements have associated labels
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●`[accesskey]` values are unique
●ARIA attributes are used as specified for the element's role
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
●`[lang]` attributes have a valid value
●Heading elements appear in a sequentially-descending order
●Skip links are focusable.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●`<video>` elements contain a `<track>` element with `[kind="captions"]`
●Uses ARIA roles only on compatible elements
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
●`<td>` elements in a large `<table>` have one or more table headers.
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○`[role]`s are contained by their required parent element
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○ARIA IDs are unique
○No form fields have multiple labels
○`<frame>` or `<iframe>` elements have a title
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Image elements do not have `[alt]` attributes that are redundant text.
100

Best Practices

General

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLMap URL
/w/load.php?lang=en&modules=ext.centralNotice.bannerHisto.../w/load.php?lang=en&modules=ext.centralNotice.bannerHisto...
/w/load.php?lang=en&modules=mw.config.values.wbCurrentSit.../w/load.php?lang=en&modules=mw.config.values.wbCurrentSit...
/w/load.php?lang=en&modules=ext.visualEditor.core.utils.p.../w/load.php?lang=en&modules=ext.visualEditor.core.utils.p...
/w/load.php?lang=en&modules=ext.gadget.ReferenceTooltips%.../w/load.php?lang=en&modules=ext.gadget.ReferenceTooltips%...
/w/load.php?lang=en&modules=ext.cite.referencePreviews%7C.../w/load.php?lang=en&modules=ext.cite.referencePreviews%7C...
/w/load.php?lang=en&modules=startup&only=scripts&raw=1&sk.../w/load.php?lang=en&modules=startup&only=scripts&skin=vec...
●Uses HTTPS
●Avoids deprecated APIs
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Avoids requesting the notification permission on page load
●Displays images with correct aspect ratio
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No browser errors logged to the console
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Ensure proper origin isolation with COOP
●Mitigate clickjacking with XFO or CSP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
○Redirects HTTP traffic to HTTPS
○Use a strong HSTS policy
85

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
p > span > a.mw-file-description > img.mw-file-element p > span > a.mw-file-description > img.mw-file-element
div.mw-content-ltr > figure.mw-default-size > a.mw-file-description > img.mw-file-element div.mw-content-ltr > figure.mw-default-size > a.mw-file-description > img.mw-file-element
div.mw-content-ltr > figure.mw-default-size > a.mw-file-description > img.mw-file-element div.mw-content-ltr > figure.mw-default-size > a.mw-file-description > img.mw-file-element

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Page has successful HTTP status code
●Links have descriptive text
●Links are crawlable
●robots.txt is valid
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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