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Lighthouse Mobile

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

Audit breakdown by category with detailed findings.

44

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
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms159.2 KiB
/export/system/modules/cz.nelasoft.opencms.media/resource...0.0 ms79.7 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms74.0 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...0.0 ms71.4 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms67.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms53.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms51.2 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms47.6 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms43.7 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms42.4 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms41.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms36.1 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms36.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms36.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms35.5 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...0.0 ms33.5 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms33.5 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms30.2 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms30.1 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...0.0 ms29.8 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...86400.0 s74.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms29.1 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms28.7 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms28.6 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms28.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms28.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms26.4 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms25.6 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms25.5 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms24.7 KiB
/export/system/modules/cz.nelasoft.opencms.media/resource...0.0 ms24.4 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms24.1 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms23.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms22.9 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms21.0 KiB
/system/modules/cz.osw.opencms.types/resources/slick-phot...86400.0 s52.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms20.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms20.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms20.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms19.4 KiB
/export/system/modules/cz.osw.opencms.types/elements/cook...0.0 ms18.8 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...0.0 ms15.8 KiB
/.content/galerie-obrazku/aktuality/2026/2026_04_21_Radim...86400.0 s37.9 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/owl...86400.0 s23.7 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms8.4 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/coo...86400.0 s20.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms8.1 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms8.1 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms8.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms7.6 KiB
/system/modules/cz.osw.opencms.types/elements/cookies/coo...86400.0 s18.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms7.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms7.3 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms7.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms6.9 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms6.8 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms6.7 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms6.4 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms6.3 KiB
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/modernizr.js86400.0 s15.2 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms6.0 KiB
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...0.0 ms5.6 KiB
/export/system/modules/cz.osw.opencms.types/resources/sli...0.0 ms5.0 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...0.0 ms3.0 KiB
/export/system/modules/cz.osw.opencms.types/resources/sli...0.0 ms2.8 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...86400.0 s6.4 KiB
/export/system/modules/cz.osw.opencms.types/resources/sli...0.0 ms2.2 KiB
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/dropdown.js86400.0 s5.0 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...0.0 ms1.9 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...0.0 ms1.7 KiB
/export/system/modules/cz.osw.opencms.types/resources/sli...0.0 ms1.6 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...0.0 ms392 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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
/export/system/modules/cz.osw.opencms.types/resources/sli...160 ms
/font-awesome/4.6.3/fonts/fontawesome-webfont.woff2?v=4.6.320 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:36.265 source:map[column:4688 line:3 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js 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:20.29 source:map[column:24594 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:125.551 source:map[column:30738 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:0.663 source:map[column:27566 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:0.171 source:map[column:27658 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:6.441 source:map[column:24616 line:2 type:source-location url:https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js urlProvider:network]] map[reflowTime:0.031 source:map[type:text value:[unattributed]]] map[reflowTime:0.081 source:map[column:387 line:0 type:source-location url:https://osw-analytics3.avcr.cz/js/plausible.manual.file-downloads.js urlProvider:network]]]

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
div.slide-item > a > div.img-wrapper > img.img-fluid div.slide-item > a > div.img-wrapper > img.img-fluid
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...158.9 KiB133.8 KiB
Na hradě Štamberk se zřejmě bydlelo pouhých 150 let. div.content > div.thumbs > div.bigThumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...73.7 KiB60.5 KiB
Hlavní dominantu Vyšehradu dnes tvoří kapitulní chrám sv. apoštolů Petra a Pavl… div.content > div.thumbs > div.bigThumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...53.5 KiB40.3 KiB
Na okraji Kroměříže se nacházejí dva Medkovy rybníky. Invazní sumeček černý se … div.content > div.thumbs > div.bigThumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...50.8 KiB37.6 KiB
Akademie věd České republiky div.footer > div.logo > a > img
/export/system/modules/cz.nelasoft.opencms.avcr/resources...29.5 KiB28.2 KiB
Centrum translačního výzkumu PharmTheon se nachází na pražské Harfě. Disponuje … div.content > div.thumbs > div.bigThumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...40.7 KiB27.5 KiB
Letiště Roudnice nad Labem. Odsud startovaly lety pro veřejnost v rámci Archeol… div.content > div.thumbs > div.bigThumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...33.2 KiB20.0 KiB
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...47.2 KiB17.3 KiB
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...42.1 KiB12.2 KiB
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/.content/galerie-obrazku/aktuality/2026/2026_04_21_Radim...37.6 KiB7.7 KiB
Sumeček černý pochází původně ze Severní Ameriky, do Evropy se dostal v 19. sto… div.content > div.thumbs > div.thumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...8.1 KiB6.7 KiB
Z hradu se zachoval kus vysoké jižní zdi, částečně odhalené stěny dvouprostorov… div.content > div.thumbs > div.thumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...7.8 KiB6.5 KiB
V roce 2003 povýšil papež Jan Pavel II. vyšehradský kapitulní chrám na papežsko… div.content > div.thumbs > div.thumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...7.8 KiB6.5 KiB
Zřícenina se nachází u Telče, která je nejen kulturní památkou zapsanou na Sezn… div.content > div.thumbs > div.thumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...7.7 KiB6.4 KiB
Čas jeho slávy se dá ohraničit poslední čtvrtinou 13. století a husitskými válk… div.content > div.thumbs > div.thumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...7.3 KiB6.0 KiB
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...35.7 KiB5.8 KiB
Kromě letadla s pilotem potřebuje „nebeský“ archeolog i další vybavení. Dříve, … div.content > div.thumbs > div.thumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...7.0 KiB5.7 KiB
Pro vodní ekosystémy představuje tato rybka velkou hrozbu. Je všežravá, nemá mn… div.content > div.thumbs > div.thumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...7.0 KiB5.6 KiB
„Chovatelé mají s tímto druhem velký problém. Finanční ztráty se dají vyčíslit … div.content > div.thumbs > div.thumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...6.7 KiB5.4 KiB
V současné době výzkumníci rozvíjejí několik projektů, které se zaměřují předev… div.content > div.thumbs > div.thumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...6.6 KiB5.3 KiB
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...35.1 KiB5.2 KiB
V kapli sv. Klimenta uvnitř chrámu se nachází románský sarkofág (v pravém dolní… div.content > div.thumbs > div.thumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...6.5 KiB5.2 KiB
Pod presbytářem kapitulního chrámu je dobře zachovaná románská apsida (půlkruho… div.content > div.thumbs > div.thumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...6.4 KiB5.1 KiB
Návštěvníci měli možnost zúčastnit se letu s nestorem české letecké archeologie… div.content > div.thumbs > div.thumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...6.1 KiB4.8 KiB
Při přenosu léků z laboratoře do klinické praxe je klíčová rychlost a preciznos… div.content > div.thumbs > div.thumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...6.0 KiB4.7 KiB
Pomocí NMR spektroskopie vědci v PharmTheonu zkoumají, jak přesně vypadají a fu… div.content > div.thumbs > div.thumb > img
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...5.7 KiB4.4 KiB

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]
items: [map[duration:2298.3490001220703 label:Time to first byte subpart:timeToFirstByte] map[duration:1460.7989998779296 label:Element render delay subpart:elementRenderDelay]]
lhId: page-26-DIV
nodeLabel: O lesích a biodiverzitě s ekologem a botanikem Radimem Hédlem
path: 1,HTML,1,BODY,1,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,1,DIV,0,A,1,DIV,0,DIV
selector: div.slide-item > a > div.slide-text > div.slide-caption
snippet: <div class="slide-caption">

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
value: no origins were preconnected
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

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 SizeDuration
/system/modules/cz.osw.opencms.types/resources/slick-phot...52.3 KiB1.2 s
/export/system/modules/cz.nelasoft.opencms.media/resource...79.7 KiB2.4 s
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...74.3 KiB2.1 s
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...6.4 KiB307 ms
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/dropdown.js5.0 KiB307 ms
/system/modules/cz.nelasoft.opencms.avcr/resources/js/owl...23.7 KiB910 ms
/export/system/modules/cz.nelasoft.opencms.media/resource...24.4 KiB1.2 s
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/modernizr.js15.2 KiB608 ms
/export/system/modules/cz.nelasoft.opencms.avcr/resources...15.8 KiB1.5 s
/export/system/modules/cz.nelasoft.opencms.avcr/resources...33.5 KiB2.1 s
/export/system/modules/cz.nelasoft.opencms.avcr/resources...392 B307 ms
/export/system/modules/cz.osw.opencms.types/resources/sli...5.0 KiB307 ms
/export/system/modules/cz.nelasoft.opencms.avcr/resources...1.9 KiB910 ms
/export/system/modules/cz.nelasoft.opencms.avcr/resources...3.0 KiB910 ms
/export/system/modules/cz.nelasoft.opencms.avcr/resources...1.7 KiB910 ms
/export/system/modules/cz.nelasoft.opencms.avcr/resources...71.4 KiB2.7 s
/export/system/modules/cz.osw.opencms.types/resources/sli...2.2 KiB307 ms
ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js33.4 KiB2.0 s
netdna.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.css7.4 KiB1.1 s

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLProtocol
www.avcr.cz/cs/http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...http/1.1
/export/system/modules/cz.osw.opencms.types/resources/sli...http/1.1
/export/system/modules/cz.nelasoft.opencms.media/resource...http/1.1
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...http/1.1
/export/system/modules/cz.nelasoft.opencms.media/resource...http/1.1
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/modernizr.jshttp/1.1
/system/modules/cz.nelasoft.opencms.avcr/resources/js/owl...http/1.1
www.avcr.cz/system/modules/cz.nelasoft.opencms.avcr/resources/js/dropdown.jshttp/1.1
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...http/1.1
/system/modules/cz.osw.opencms.types/resources/slick-phot...http/1.1
/export/system/modules/cz.nelasoft.opencms.avcr/resources...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/.content/galerie-obrazku/aktuality/2026/2026_04_21_Radim...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...http/1.1
/system/modules/cz.osw.opencms.types/elements/cookies/coo...http/1.1
/system/modules/cz.nelasoft.opencms.avcr/resources/js/coo...http/1.1
/export/system/modules/cz.osw.opencms.types/resources/sli...http/1.1
/export/system/modules/cz.osw.opencms.types/resources/sli...http/1.1
/export/system/modules/cz.osw.opencms.types/resources/sli...http/1.1
/export/system/modules/cz.osw.opencms.types/elements/cook...http/1.1
www.avcr.cz/favicon.icohttp/1.1

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

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 2.4 s
URLTime Spent
cas.cz/1.2 s
www.avcr.cz/1.2 s
www.avcr.cz/cs/0.0 ms

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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: 300 ms 33.5 KiB
URLTransfer SizeEst Savings
/export/system/modules/cz.nelasoft.opencms.avcr/resources...71.4 KiB21.5 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...33.5 KiB5.1 KiB
/export/system/modules/cz.nelasoft.opencms.media/resource...24.4 KiB4.4 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...15.8 KiB2.6 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: 600 ms 120.9 KiB
URLTransfer SizeEst Savings
/export/system/modules/cz.nelasoft.opencms.avcr/resources...71.1 KiB64.9 KiB
/export/system/modules/cz.nelasoft.opencms.media/resource...24.1 KiB24.1 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...33.2 KiB16.3 KiB
/export/system/modules/cz.nelasoft.opencms.avcr/resources...15.5 KiB15.5 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: 910 ms 237.7 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtag/js?id=G-ETQEE59TKV156.8 KiB85.7 KiB
/export/system/modules/cz.nelasoft.opencms.media/resource...79.3 KiB65.3 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/jqu...74.0 KiB65.1 KiB
/system/modules/cz.nelasoft.opencms.avcr/resources/js/owl...23.3 KiB21.6 KiB

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Style & Layout1.1 s
Script Evaluation1.1 s
Other985 ms
Rendering305 ms
Parse HTML & CSS134 ms
Script Parsing & Compilation109 ms
Garbage Collection7.6 ms

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 11.1 KiB
URLTransfer SizeEst Savings
/system/modules/cz.nelasoft.opencms.avcr/resources/js/coo...20.5 KiB11.1 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
div.slide-item > a > div.img-wrapper > img.img-fluid div.slide-item > a > div.img-wrapper > img.img-fluid
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/.content/galerie-obrazku/aktuality/2026/2026_04_21_Radim...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.col-xs-12 > div.image > a > img.img-responsive div.col-xs-12 > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...
div.video-entry-inner > div.image > a > img.img-responsive div.video-entry-inner > div.image > a > img.img-responsive
/export/sites/avcr.cz/.content/galerie-obrazku/aktuality/...

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

●Layout shift culprits
●Optimize DOM size
●Optimize viewport for mobile
●Avoids enormous network payloads Total size was 2,263 KiB
●JavaScript execution time 1.1 s
●Avoid long main-thread tasks 10 long tasks found
●Avoid non-composited animations 1 animated element found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 160 ms
●Server Backend Latencies 40 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 360 ms
○INP breakdown
○LCP request discovery
○User Timing marks and measures
○Avoid large layout shifts
89

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.

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.header > div.header-base > div.header-toggle > button div.header > div.header-base > div.header-toggle > button

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#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a
div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a
div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a
div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a div#list-iems-2029cc38-683b-11e9-ade2-005056bf6eb8 > div.col-xs-12 > div.image > a
div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a
div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a
div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a
div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a div#list-iems-7dce9a82-51c2-11ec-bca5-005056bf6eb8 > div.col-xs-12 > div.image > a
div.video-entry > div.video-entry-inner > div.image > a div.video-entry > div.video-entry-inner > div.image > a
div.video-entry > div.video-entry-inner > div.image > a.play-button-videorep div.video-entry > div.video-entry-inner > div.image > a.play-button-videorep
div > div.col-xs-12 > div.image > a div > div.col-xs-12 > div.image > a
div.content > div.title > h3 > a div.content > div.title > h3 > a

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
Část obsahu šířena pod licencí Creative commons div.wrapper-footer > div.footer > div.footer-quote > a
Prohlášení o přístupnosti div.service-menu > ul > li > a
Zpracování osobních údajů div.service-menu > ul > li > a

These items highlight common accessibility best practices.

○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
●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
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Image elements have `[alt]` attributes
●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.
●ARIA attributes are used as specified for the element's role
●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links are distinguishable without relying on color.
●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
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●All heading elements contain content.
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○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.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
96

Best Practices

User Experience

Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLDisplayed sizeActual sizeExpected size
Akademie věd České republiky div.header-base > div.logo > a > img
/export/system/modules/cz.nelasoft.opencms.avcr/resources...167 x 45167 x 45251 x 68
●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
●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
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate clickjacking with XFO or CSP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
100

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.

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

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