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· 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.

34

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
www.uw.edu.pl/wp-content/uploads/2025/03/telefon-zaufania-uw-1024x724.png0.0 ms522.7 KiB
/wp-content/uploads/2026/04/wiosna-z-hr-excellence-in-res...0.0 ms349.1 KiB
www.uw.edu.pl/wp-content/uploads/2026/02/zdjecie_wyrozniajace_610x405_idub.jpg0.0 ms164.2 KiB
www.uw.edu.pl/wp-content/uploads/2024/10/otwarte-czwartki-610x405.png0.0 ms159.8 KiB
www.uw.edu.pl/wp-content/uploads/2023/06/idub_logo-1024x459.png0.0 ms148.4 KiB
/wp-content/uploads/2026/04/wiosna-z-hr-excellence-in-res...0.0 ms131.0 KiB
/wp-content/uploads/2014/01/krakowskie-przedmiescie-dawna...0.0 ms128.7 KiB
/wp-content/uploads/2025/11/4-glowy_twoja-glowa_twoja-sil...0.0 ms123.7 KiB
www.uw.edu.pl/wp-content/uploads/2025/05/czuwanie_18052025_043-960x465.jpg0.0 ms116.8 KiB
www.uw.edu.pl/wp-content/uploads/2026/04/dzien_otwarty_18042026_147-960x465.jpg0.0 ms110.1 KiB
www.uw.edu.pl/wp-content/uploads/2017/07/logo-2-11.png0.0 ms107.5 KiB
www.uw.edu.pl/wp-content/uploads/2020/11/wsparcie-uw-kafelek-1-1024x760.jpg0.0 ms102.8 KiB
www.uw.edu.pl/wp-content/themes/uw/library/js/main.min.js?150320240.0 ms102.1 KiB
/wp-content/uploads/2026/04/nawa_spotkanie_z_ministrem_sz...0.0 ms93.7 KiB
/wp-content/uploads/2023/04/sesja_studencka_2022_dzien_1_...0.0 ms89.7 KiB
/wp-content/uploads/2023/11/obiekty_uw_049_©uniwersytet_...0.0 ms81.0 KiB
www.uw.edu.pl/wp-content/uploads/2019/10/uw_wrzesien_2019_final-2-610x405.jpg0.0 ms80.9 KiB
www.uw.edu.pl/wp-content/uploads/2026/04/plakat-610x405.jpg0.0 ms79.6 KiB
www.uw.edu.pl/wp-content/uploads/2026/04/msd-polska-4-610x405.jpg0.0 ms75.7 KiB
www.uw.edu.pl/wp-content/uploads/2023/04/zonkile-610x405.jpg0.0 ms75.3 KiB
/wp-content/uploads/2019/10/brama-uw-09.2019-fot.-m.-kazm...0.0 ms72.6 KiB
www.uw.edu.pl/wp-content/themes/uw/library/img/main_section_bg.png0.0 ms72.4 KiB
www.uw.edu.pl/wp-content/uploads/2026/04/sns-scaled-610x405.jpg0.0 ms61.8 KiB
www.uw.edu.pl/wp-content/uploads/2026/04/zrzut-ekranu-2026-04-17-o-18.06.26.jpg0.0 ms61.6 KiB
/wp-content/uploads/2026/04/fake-busters.-fot.-krystian-s...0.0 ms51.3 KiB
/wp-content/uploads/2026/04/konferencja_erasmus_koordynat...0.0 ms50.5 KiB
www.uw.edu.pl/wp-content/uploads/2026/04/heurystyki-2026-1-610x405.jpg0.0 ms49.5 KiB
www.uw.edu.pl/wp-content/themes/uw/library/css/main.css?150320240.0 ms47.3 KiB
/wp-content/uploads/2026/04/zrzut-ekranu-2026-04-17-o-18....0.0 ms42.0 KiB
www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.min.js0.0 ms41.9 KiB
www.uw.edu.pl/wp-content/uploads/2025/02/ikonka_alarm-1024x568.jpg0.0 ms38.0 KiB
www.uw.edu.pl/wp-content/uploads/2026/04/ales-bialacki-7-610x405.jpg0.0 ms33.2 KiB
www.uw.edu.pl/wp-content/uploads/2022/03/hr-excellence.jpg0.0 ms31.5 KiB
www.uw.edu.pl/wp-content/uploads/2026/02/topmarka2025_green-1024x359.jpg0.0 ms31.5 KiB
www.uw.edu.pl/wp-content/uploads/2019/03/logo_duze.png0.0 ms28.7 KiB
www.uw.edu.pl/wp-content/uploads/2024/09/komunikaty-1024x576.jpg0.0 ms25.2 KiB
www.uw.edu.pl/wp-content/themes/uw/library/js/scripts.js?150320240.0 ms25.0 KiB
/wp-content/uploads/2022/11/04_znak_podstawowy_mono_ciemn...0.0 ms15.9 KiB
www.google-analytics.com/analytics.js7200.0 s20.9 KiB
www.uw.edu.pl/wp-content/themes/uw/library/img/arrow_left_bright.png0.0 ms15.4 KiB
www.uw.edu.pl/wp-content/themes/uw/library/img/arrow_right_bright.png0.0 ms15.4 KiB
www.uw.edu.pl/wp-includes/js/thickbox/loadingAnimation.gif0.0 ms15.2 KiB
www.uw.edu.pl/wp-content/uploads/2017/07/logo_krasp1.png0.0 ms12.6 KiB
www.uw.edu.pl/wp-content/uploads/2021/09/logo_idub.png0.0 ms12.4 KiB
www.uw.edu.pl/wp-content/uploads/2019/02/logo_4eu_rgb.png0.0 ms11.7 KiB
www.uw.edu.pl/wp-content/plugins/page-links-to/dist/new-tab.js0.0 ms10.9 KiB
www.uw.edu.pl/wp-content/uploads/2017/07/logo_eaec1.png0.0 ms10.1 KiB
/wp-content/uploads/2024/07/znak_kpo_poziom_web_linie2-e1...0.0 ms9.2 KiB
www.uw.edu.pl/wp-content/uploads/2017/07/logo_unica1.png0.0 ms8.8 KiB
/wp-content/uploads/2019/08/eu-flag-erasmus_vect_pos-bw-e...0.0 ms8.2 KiB
www.uw.edu.pl/wp-content/uploads/2017/07/logo_excellence1.png0.0 ms7.7 KiB
/wp-content/uploads/2024/07/fe_dla_rozwoju_spolecznego_we...0.0 ms7.6 KiB
www.uw.edu.pl/wp-content/themes/uw/library/js/libs/modernizr.custom.min.js0.0 ms7.4 KiB
/wp-content/uploads/2024/07/fe_dla_nowoczesnej_gospodarki...0.0 ms7.3 KiB
/wp-content/plugins/cookie-law-info/public/js/cookie-law-...0.0 ms7.1 KiB
www.uw.edu.pl/wp-content/themes/uw/library/img/flag_pl.png0.0 ms7.0 KiB
www.uw.edu.pl/wp-content/uploads/2025/12/feniks_kontra-1.png0.0 ms6.8 KiB
ml314.com/taglw.aspx?2233600.0 s8.5 KiB
/wp-content/plugins/cookie-law-info/public/css/cookie-law...0.0 ms6.3 KiB
www.uw.edu.pl/wp-includes/js/wp-emoji-release.min.js0.0 ms5.5 KiB
www.uw.edu.pl/wp-includes/js/thickbox/thickbox.js0.0 ms5.3 KiB
commerce-js.sovrn.co/commerce-js.iife.js604800.0 s49.5 KiB
www.uw.edu.pl/wp-content/themes/uw/library/img/flaga_UE_pl_2024.png0.0 ms4.4 KiB
cdn.shareaholic.net/assets/pub/shareaholic.js1200.0 s4.7 KiB
www.uw.edu.pl/wp-content/themes/uw/library/js/wcag.js0.0 ms3.0 KiB
cdn.viglink.com/api/vglnk.js604800.0 s29.1 KiB
www.uw.edu.pl/wp-content/themes/uw/library/css/custom-pi.css?150320240.0 ms2.8 KiB
www.uw.edu.pl/wp-content/themes/uw/library/js/what-input.min.js0.0 ms2.4 KiB
www.uw.edu.pl/wp-content/plugins/newsletter/subscription/style.css0.0 ms1.9 KiB
www.uw.edu.pl/wp-content/themes/uw/library/js/class/class.Core.js?150320240.0 ms1.8 KiB
www.uw.edu.pl/wp-includes/js/thickbox/thickbox.css0.0 ms1.4 KiB
comparisons.sovrn.com/js/loader.min.js0.0 ms1.4 KiB
www.uw.edu.pl/wp-content/themes/uw/library/img/arrow_down.png0.0 ms1.4 KiB
www.uw.edu.pl/wp-content/themes/uw/library/img/arrow_up.png0.0 ms1.4 KiB
/wp-content/plugins/cookie-law-info/public/css/cookie-law...0.0 ms1.3 KiB
www.uw.edu.pl/wp-content/themes/uw/library/img/event_bg.png0.0 ms1.3 KiB
www.uw.edu.pl/wp-content/themes/uw/library/img/event_date_box_bg.png0.0 ms1.3 KiB
www.uw.edu.pl/wp-content/themes/uw/library/img/white_alpha_bg97.png0.0 ms1.2 KiB
www.uw.edu.pl/wp-includes/js/wp-embed.min.js0.0 ms1.2 KiB
cdn.tynt.com/afsh.js259200.0 s5.5 KiB
www.uw.edu.pl/wp-content/plugins/sitemap/css/page-list.css0.0 ms1.0 KiB
www.uw.edu.pl/wp-content/themes/uw/library/img/bip.png0.0 ms915 B
www.uw.edu.pl/wp-content/plugins/newsletter/subscription/validate.js0.0 ms797 B
um.simpli.fi/empty.gif0.0 ms563 B
www.uw.edu.pl/wp-content/themes/uw/library/img/white_gradient.png0.0 ms517 B
www.uw.edu.pl/wp-content/themes/uw/library/img/mini_arrow_r.png0.0 ms513 B
www.uw.edu.pl/wp-content/themes/uw/library/img/menu2_bg.png0.0 ms494 B
commerce-js.sovrn.co/commerce-js.css604800.0 s4.8 KiB
www.uw.edu.pl/wp-content/themes/uw/library/img/mini_arrow_r_blue.png0.0 ms479 B
px.owneriq.net/stas/s/sholic.js0.0 ms474 B
www.uw.edu.pl/wp-content/themes/uw/library/img/menu3_break.png0.0 ms466 B
www.uw.edu.pl/wp-content/themes/uw/library/img/menu2_break.png0.0 ms466 B
/idsync/ex/receive/check?partner_id=2305&partner_device_i...0.0 ms428 B
/syncMe?partnerDomain=simpli.fi&idType=cookie&partnerUser...0.0 ms387 B
ps.eyeota.net/match/bounce/?bid=irm51m1&uid=49AFE493F9F3471F8B476994356F37E50.0 ms354 B
cs.media.net/cksync.php?cs=1&type=bs&ovsid=&gdpr=&gdpr_consent=&gpp=0.0 ms315 B
sb.scorecardresearch.com/p2?c1=7&c2=19376307&c3=1&cv=3.6.0&cj=10.0 ms300 B
simplifi.partners.tremorhub.com/sync?UISF=92FADB580F7B4D37B4B28FD77EE77BA80.0 ms175 B
/signal/v1/page_view?data_source_key=Gg1Si3AkcN&ip=92.38....0.0 ms94 B
ml314.com/csync.ashx?fp=8003581831908413139&person_id=3660580298884120578&eid=286387.0 s56 B
ml314.com/csync.ashx?fp=8003581831908413139&person_id=3660580298906140672&eid=286387.0 s56 B
ml314.com/csync.ashx?fp=&person_id=3660580298906140672&eid=5008286387.0 s56 B

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:1.000002] map[node:map[boundingRect:map[bottom:5238 height:5238 left:0 right:1350 top:0 width:1350] lhId:page-32-HTML nodeLabel:html.js path:5,HTML selector:html.js snippet:<html lang="pl-PL" prefix="og: http://ogp.me/ns# fb: http://ogp.me/ns/fb#" class=" js flexbox webgl no-touch geolocation hashchange history websockets rgba …" style="" data-whatinput="initial" data-whatintent="initial"> type:node] score:1] map[score:2e-06 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTSGmu0SC55K5gw.woff2]]] type:subitems]]]

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
/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.030 ms
/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTSGmu...10 ms
/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu...5.0 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:29.308 source:map[column:640 line:4 type:source-location url:https://www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.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:9.583 source:map[column:30882 line:3 type:source-location url:https://www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.min.js urlProvider:network]] map[reflowTime:0.22 source:map[column:30979 line:3 type:source-location url:https://www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.min.js urlProvider:network]] map[reflowTime:0.185 source:map[column:31260 line:3 type:source-location url:https://www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.min.js urlProvider:network]] map[reflowTime:0.046 source:map[column:31351 line:3 type:source-location url:https://www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.min.js urlProvider:network]] map[reflowTime:0.104 source:map[column:31632 line:3 type:source-location url:https://www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.min.js urlProvider:network]] map[reflowTime:0.162 source:map[column:31782 line:3 type:source-location url:https://www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.min.js urlProvider:network]] map[reflowTime:0.223 source:map[column:31900 line:3 type:source-location url:https://www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.min.js urlProvider:network]] map[reflowTime:1.698 source:map[column:28444 line:5 type:source-location url:https://www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.min.js urlProvider:network]] map[reflowTime:2.3 source:map[column:3774 line:5 type:source-location url:https://www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.min.js urlProvider:network]] map[reflowTime:13.404 source:map[column:5688 line:5 type:source-location url:https://www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.min.js urlProvider:network]] map[reflowTime:1.383 source:map[column:3796 line:5 type:source-location url:https://www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.min.js urlProvider:network]] map[reflowTime:3.078 source:map[column:27 line:442 type:source-location url:https://www.uw.edu.pl/wp-content/themes/uw/library/js/main.min.js?15032024 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.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2025/03/telefon-zaufania-uw-1024x724.png522.3 KiB512.9 KiB
div.grid-news-item > div.block > a.block > div.image div.grid-news-item > div.block > a.block > div.image
/wp-content/uploads/2026/04/wiosna-z-hr-excellence-in-res...348.7 KiB308.5 KiB
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2026/02/zdjecie_wyrozniajace_610x405_idub.jpg163.9 KiB155.0 KiB
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2023/06/idub_logo-1024x459.png148.1 KiB142.1 KiB
div.grid-news-item > div.block > a.block > div.image div.grid-news-item > div.block > a.block > div.image
www.uw.edu.pl/wp-content/uploads/2024/10/otwarte-czwartki-610x405.png159.5 KiB119.3 KiB
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
/wp-content/uploads/2025/11/4-glowy_twoja-glowa_twoja-sil...123.4 KiB106.4 KiB
Logo Uniwersytet Warszawski - strona główna section.mid-bar > div.logo > a > img
www.uw.edu.pl/wp-content/uploads/2017/07/logo-2-11.png107.2 KiB103.9 KiB
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2020/11/wsparcie-uw-kafelek-1-1024x760.jpg102.5 KiB94.5 KiB
div.grid-news-item > div.block > a.block > div.image div.grid-news-item > div.block > a.block > div.image
/wp-content/uploads/2014/01/krakowskie-przedmiescie-dawna...128.3 KiB88.1 KiB
div.items > div.slider-item > a > p.block div.items > div.slider-item > a > p.block
/wp-content/uploads/2026/04/wiosna-z-hr-excellence-in-res...130.7 KiB58.0 KiB
div.grid-news-item > div.block > a.block > div.image div.grid-news-item > div.block > a.block > div.image
/wp-content/uploads/2026/04/nawa_spotkanie_z_ministrem_sz...93.3 KiB53.1 KiB
div.grid-news-item > div.block > a.block > div.image div.grid-news-item > div.block > a.block > div.image
/wp-content/uploads/2023/04/sesja_studencka_2022_dzien_1_...89.3 KiB49.1 KiB
div.inner > div.right-column-banner > a.no-link-icon > img div.inner > div.right-column-banner > a.no-link-icon > img
www.uw.edu.pl/wp-content/uploads/2026/04/zrzut-ekranu-2026-04-17-o-18.06.26.jpg61.3 KiB48.3 KiB
div.items > div.slider-item > a > p.block div.items > div.slider-item > a > p.block
www.uw.edu.pl/wp-content/uploads/2025/05/czuwanie_18052025_043-960x465.jpg116.5 KiB43.8 KiB
div.grid-news-item > div.block > a.block > div.image div.grid-news-item > div.block > a.block > div.image
/wp-content/uploads/2023/11/obiekty_uw_049_©uniwersytet_...80.7 KiB40.5 KiB
div.grid-news-item > div.block > a.block > div.image div.grid-news-item > div.block > a.block > div.image
www.uw.edu.pl/wp-content/uploads/2019/10/uw_wrzesien_2019_final-2-610x405.jpg80.6 KiB40.4 KiB
div.grid-news-item > div.block > a.block > div.image div.grid-news-item > div.block > a.block > div.image
www.uw.edu.pl/wp-content/uploads/2026/04/plakat-610x405.jpg79.3 KiB39.1 KiB
div.items > div.slider-item > a > p.block div.items > div.slider-item > a > p.block
www.uw.edu.pl/wp-content/uploads/2026/04/dzien_otwarty_18042026_147-960x465.jpg109.7 KiB37.1 KiB
div.grid-news-item > div.block > a.block > div.image div.grid-news-item > div.block > a.block > div.image
www.uw.edu.pl/wp-content/uploads/2026/04/msd-polska-4-610x405.jpg75.4 KiB35.1 KiB
div.grid-news-item > div.block > a.block > div.image div.grid-news-item > div.block > a.block > div.image
www.uw.edu.pl/wp-content/uploads/2023/04/zonkile-610x405.jpg75.0 KiB34.8 KiB
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2025/02/ikonka_alarm-1024x568.jpg37.6 KiB34.7 KiB
Aktualności Dzień rektorski 4 maja Zgodnie z decyzją prof. Alojzego Z. Nowaka,… div.main-wrapper > main.body > section.body-content > section.uni-box
www.uw.edu.pl/wp-content/themes/uw/library/img/main_section_bg.png72.1 KiB34.0 KiB
div.grid-news-item > div.block > a.block > div.image div.grid-news-item > div.block > a.block > div.image
/wp-content/uploads/2019/10/brama-uw-09.2019-fot.-m.-kazm...72.3 KiB32.1 KiB
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2026/02/topmarka2025_green-1024x359.jpg31.2 KiB28.7 KiB
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2022/03/hr-excellence.jpg31.2 KiB23.4 KiB
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2024/09/komunikaty-1024x576.jpg24.8 KiB22.9 KiB
div.grid-news-item > div.block > a.block > div.image div.grid-news-item > div.block > a.block > div.image
www.uw.edu.pl/wp-content/uploads/2026/04/sns-scaled-610x405.jpg61.5 KiB21.3 KiB
div.grid-news-item > div.block > a.block > div.image div.grid-news-item > div.block > a.block > div.image
/wp-content/uploads/2026/04/fake-busters.-fot.-krystian-s...51.0 KiB10.8 KiB
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2019/02/logo_4eu_rgb.png11.4 KiB10.3 KiB
div.grid-news-item > div.block > a.block > div.image div.grid-news-item > div.block > a.block > div.image
/wp-content/uploads/2026/04/konferencja_erasmus_koordynat...50.2 KiB10.0 KiB
div.grid-news-item > div.block > a.block > div.image div.grid-news-item > div.block > a.block > div.image
www.uw.edu.pl/wp-content/uploads/2026/04/heurystyki-2026-1-610x405.jpg49.2 KiB9.0 KiB
Program wieloletni Uniwersytetu Warszawskiego 2016-2027 section.top-bar > div.top-flags > span > img
www.uw.edu.pl/wp-content/themes/uw/library/img/flag_pl.png6.7 KiB5.8 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:1779.097 label:Time to first byte subpart:timeToFirstByte] map[duration:1382.618 label:Resource load delay subpart:resourceLoadDelay] map[duration:1097.134 label:Resource load duration subpart:resourceLoadDuration] map[duration:38.049 label:Element render delay subpart:elementRenderDelay]]
lhId: page-17-P
nodeLabel: div.items > div.slider-item > a > p.block
path: 5,HTML,2,BODY,8,DIV,2,MAIN,0,SECTION,0,DIV,0,DIV,1,A,1,P
selector: div.items > div.slider-item > a > p.block
snippet: <p class="block slide-link" style="background-image: url(&quot;https://www.uw.edu.pl/wp-content/uploads/2026/04/dzi…&quot;);">

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-17-P
nodeLabel: div.items > div.slider-item > a > p.block
path: 5,HTML,2,BODY,8,DIV,2,MAIN,0,SECTION,0,DIV,0,DIV,1,A,1,P
selector: div.items > div.slider-item > a > p.block
snippet: <p class="block slide-link" style="background-image: url(&quot;https://www.uw.edu.pl/wp-content/uploads/2026/04/dzi…&quot;);">

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.uw.edu.pl/http/1.1
/wp-content/plugins/cookie-law-info/public/css/cookie-law...http/1.1
/wp-content/plugins/cookie-law-info/public/css/cookie-law...http/1.1
www.uw.edu.pl/wp-content/plugins/sitemap/css/page-list.csshttp/1.1
www.uw.edu.pl/wp-includes/js/thickbox/thickbox.csshttp/1.1
www.uw.edu.pl/wp-content/plugins/newsletter/subscription/style.csshttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/css/main.css?15032024http/1.1
www.uw.edu.pl/wp-content/themes/uw/library/css/custom-pi.css?15032024http/1.1
www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.min.jshttp/1.1
/wp-content/plugins/cookie-law-info/public/js/cookie-law-...http/1.1
www.uw.edu.pl/wp-content/themes/uw/library/js/wcag.jshttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/js/what-input.min.jshttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/js/libs/modernizr.custom.min.jshttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/js/main.min.js?15032024http/1.1
www.uw.edu.pl/wp-content/themes/uw/library/js/class/class.Core.js?15032024http/1.1
www.uw.edu.pl/wp-content/themes/uw/library/img/flag_pl.pnghttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/img/flaga_UE_pl_2024.pnghttp/1.1
www.uw.edu.pl/wp-content/uploads/2017/07/logo-2-11.pnghttp/1.1
www.uw.edu.pl/wp-content/uploads/2025/02/ikonka_alarm-1024x568.jpghttp/1.1
www.uw.edu.pl/wp-content/uploads/2024/09/komunikaty-1024x576.jpghttp/1.1
www.uw.edu.pl/wp-content/uploads/2026/02/zdjecie_wyrozniajace_610x405_idub.jpghttp/1.1
/wp-content/uploads/2025/11/4-glowy_twoja-glowa_twoja-sil...http/1.1
www.uw.edu.pl/wp-content/uploads/2025/03/telefon-zaufania-uw-1024x724.pnghttp/1.1
www.uw.edu.pl/wp-content/uploads/2019/02/logo_4eu_rgb.pnghttp/1.1
www.uw.edu.pl/wp-content/uploads/2023/06/idub_logo-1024x459.pnghttp/1.1
www.uw.edu.pl/wp-content/uploads/2020/11/wsparcie-uw-kafelek-1-1024x760.jpghttp/1.1
www.uw.edu.pl/wp-content/uploads/2026/04/zrzut-ekranu-2026-04-17-o-18.06.26.jpghttp/1.1
www.uw.edu.pl/wp-content/uploads/2022/03/hr-excellence.jpghttp/1.1
www.uw.edu.pl/wp-content/uploads/2026/02/topmarka2025_green-1024x359.jpghttp/1.1
www.uw.edu.pl/wp-includes/js/wp-emoji-release.min.jshttp/1.1
www.uw.edu.pl/wp-content/uploads/2017/07/logo_excellence1.pnghttp/1.1
www.uw.edu.pl/wp-content/uploads/2021/09/logo_idub.pnghttp/1.1
www.uw.edu.pl/wp-content/uploads/2019/03/logo_duze.pnghttp/1.1
/wp-content/uploads/2019/08/eu-flag-erasmus_vect_pos-bw-e...http/1.1
www.uw.edu.pl/wp-content/uploads/2017/07/logo_krasp1.pnghttp/1.1
www.uw.edu.pl/wp-content/uploads/2017/07/logo_unica1.pnghttp/1.1
www.uw.edu.pl/wp-content/uploads/2017/07/logo_eaec1.pnghttp/1.1
/wp-content/uploads/2022/11/04_znak_podstawowy_mono_ciemn...http/1.1
/wp-content/uploads/2024/07/fe_dla_nowoczesnej_gospodarki...http/1.1
/wp-content/uploads/2024/07/fe_dla_rozwoju_spolecznego_we...http/1.1
/wp-content/uploads/2024/07/znak_kpo_poziom_web_linie2-e1...http/1.1
www.uw.edu.pl/wp-content/uploads/2025/12/feniks_kontra-1.pnghttp/1.1
www.uw.edu.pl/wp-includes/js/thickbox/thickbox.jshttp/1.1
www.uw.edu.pl/wp-content/plugins/page-links-to/dist/new-tab.jshttp/1.1
www.uw.edu.pl/wp-content/plugins/newsletter/subscription/validate.jshttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/js/scripts.js?15032024http/1.1
www.uw.edu.pl/wp-includes/js/wp-embed.min.jshttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/img/menu3_break.pnghttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/img/menu2_bg.pnghttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/img/menu2_break.pnghttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/img/white_alpha_bg97.pnghttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/img/white_gradient.pnghttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/img/mini_arrow_r_blue.pnghttp/1.1
www.uw.edu.pl/wp-content/uploads/2026/04/dzien_otwarty_18042026_147-960x465.jpghttp/1.1
/wp-content/uploads/2026/04/wiosna-z-hr-excellence-in-res...http/1.1
www.uw.edu.pl/wp-content/uploads/2025/05/czuwanie_18052025_043-960x465.jpghttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/img/main_section_bg.pnghttp/1.1
/wp-content/uploads/2019/10/brama-uw-09.2019-fot.-m.-kazm...http/1.1
www.uw.edu.pl/wp-content/uploads/2026/04/msd-polska-4-610x405.jpghttp/1.1
/wp-content/uploads/2014/01/krakowskie-przedmiescie-dawna...http/1.1
www.uw.edu.pl/wp-content/uploads/2019/10/uw_wrzesien_2019_final-2-610x405.jpghttp/1.1
www.uw.edu.pl/wp-content/uploads/2026/04/ales-bialacki-7-610x405.jpghttp/1.1
/wp-content/uploads/2026/04/fake-busters.-fot.-krystian-s...http/1.1
/wp-content/uploads/2023/11/obiekty_uw_049_©uniwersytet_...http/1.1
/wp-content/uploads/2026/04/nawa_spotkanie_z_ministrem_sz...http/1.1
/wp-content/uploads/2026/04/konferencja_erasmus_koordynat...http/1.1
/wp-content/uploads/2026/04/wiosna-z-hr-excellence-in-res...http/1.1
www.uw.edu.pl/wp-content/uploads/2023/04/zonkile-610x405.jpghttp/1.1
/wp-content/uploads/2026/04/zrzut-ekranu-2026-04-17-o-18....http/1.1
www.uw.edu.pl/wp-content/uploads/2026/04/heurystyki-2026-1-610x405.jpghttp/1.1
www.uw.edu.pl/wp-content/uploads/2024/10/otwarte-czwartki-610x405.pnghttp/1.1
www.uw.edu.pl/wp-content/uploads/2026/04/sns-scaled-610x405.jpghttp/1.1
/wp-content/uploads/2023/04/sesja_studencka_2022_dzien_1_...http/1.1
www.uw.edu.pl/wp-content/uploads/2026/04/plakat-610x405.jpghttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/img/mini_arrow_r.pnghttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/img/event_bg.pnghttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/img/event_date_box_bg.pnghttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/img/arrow_down.pnghttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/img/arrow_up.pnghttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/img/bip.pnghttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/img/arrow_left_bright.pnghttp/1.1
www.uw.edu.pl/wp-content/themes/uw/library/img/arrow_right_bright.pnghttp/1.1
www.uw.edu.pl/wp-includes/js/thickbox/loadingAnimation.gifhttp/1.1
www.uw.edu.pl/wp-content/themes/uw/favicon.pnghttp/1.1

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

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
www.uw.edu.pl/wp-content/themes/uw/library/js/main.min.js?15032024102.1 KiB775 ms
www.uw.edu.pl/wp-content/themes/uw/library/css/main.css?1503202447.3 KiB967 ms
www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.min.js41.9 KiB391 ms
www.uw.edu.pl/wp-content/themes/uw/library/js/class/class.Core.js?150320241.8 KiB199 ms
www.uw.edu.pl/wp-content/themes/uw/library/js/libs/modernizr.custom.min.js7.4 KiB199 ms
www.uw.edu.pl/wp-content/themes/uw/library/js/what-input.min.js2.4 KiB583 ms
www.uw.edu.pl/wp-content/themes/uw/library/js/wcag.js3.0 KiB583 ms
/wp-content/plugins/cookie-law-info/public/js/cookie-law-...7.1 KiB583 ms
www.uw.edu.pl/wp-content/themes/uw/library/css/custom-pi.css?150320242.8 KiB583 ms
www.uw.edu.pl/wp-content/plugins/newsletter/subscription/style.css1.9 KiB583 ms
www.uw.edu.pl/wp-includes/js/thickbox/thickbox.css1.4 KiB583 ms
www.uw.edu.pl/wp-content/plugins/sitemap/css/page-list.css1.0 KiB583 ms
/wp-content/plugins/cookie-law-info/public/css/cookie-law...6.3 KiB583 ms
/wp-content/plugins/cookie-law-info/public/css/cookie-law...1.3 KiB199 ms
fonts.googleapis.com/css?family=Open+Sans:300,400,600,700&subset=latin-ext2.3 KiB277 ms
ajax.googleapis.com/ajax/libs/angularjs/1.0.1/angular.min.js28.7 KiB253 ms
ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/themes/smoothness/jquery-ui.css8.5 KiB249 ms
maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css7.4 KiB282 ms
cdnjs.cloudflare.com/ajax/libs/jquery-mousewheel/3.0.6/jquery.mousewheel.min.js1.2 KiB

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: 664 ms
URLTime Spent
uw.edu.pl/664 ms
www.uw.edu.pl/0.0 ms

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
html.js html.js
1.000
0.000

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

Diagnostics

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: 50 ms 41.1 KiB
URLTransfer SizeEst Savings
www.uw.edu.pl/wp-content/themes/uw/library/css/main.css?1503202446.9 KiB41.1 KiB

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 40.7 KiB
URLTransfer SizeEst Savings
www.uw.edu.pl/wp-content/themes/uw/library/js/main.min.js?15032024101.7 KiB31.0 KiB
www.uw.edu.pl/wp-content/themes/uw/library/js/scripts.js?1503202424.6 KiB9.6 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 190.7 KiB
URLTransfer SizeEst Savings
www.uw.edu.pl/wp-content/themes/uw/library/js/main.min.js?15032024101.7 KiB70.8 KiB
www.googletagmanager.com/gtag/js?id=G-B37WHT4SG8&cx=c&_slc=1147.5 KiB64.2 KiB
commerce-js.sovrn.co/commerce-js.iife.js49.1 KiB30.3 KiB
ajax.googleapis.com/ajax/libs/angularjs/1.0.1/angular.min.js28.6 KiB25.4 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
www.uw.edu.pl/wp-content/uploads/2025/03/telefon-zaufania-uw-1024x724.png522.7 KiB
/wp-content/uploads/2026/04/wiosna-z-hr-excellence-in-res...349.1 KiB
www.uw.edu.pl/wp-content/uploads/2026/02/zdjecie_wyrozniajace_610x405_idub.jpg164.2 KiB
www.uw.edu.pl/wp-content/uploads/2024/10/otwarte-czwartki-610x405.png159.8 KiB
www.uw.edu.pl/wp-content/uploads/2023/06/idub_logo-1024x459.png148.4 KiB
www.googletagmanager.com/gtag/js?id=G-B37WHT4SG8&cx=c&_slc=1147.8 KiB
/wp-content/uploads/2026/04/wiosna-z-hr-excellence-in-res...131.0 KiB
/wp-content/uploads/2014/01/krakowskie-przedmiescie-dawna...128.7 KiB
/wp-content/uploads/2025/11/4-glowy_twoja-glowa_twoja-sil...123.7 KiB
www.uw.edu.pl/wp-content/uploads/2025/05/czuwanie_18052025_043-960x465.jpg116.8 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
Sojusz 4EU+ div.slick-track > div.item > a > img.logo
www.uw.edu.pl/wp-content/uploads/2019/03/logo_duze.png
Sojusz 4EU+ div.slick-track > div.item > a > img.logo
www.uw.edu.pl/wp-content/uploads/2019/03/logo_duze.png
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
/wp-content/uploads/2025/11/4-glowy_twoja-glowa_twoja-sil...
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2020/11/wsparcie-uw-kafelek-1-1024x760.jpg
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2025/03/telefon-zaufania-uw-1024x724.png
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2024/09/komunikaty-1024x576.jpg
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2025/02/ikonka_alarm-1024x568.jpg
div.inner > div.right-column-banner > a.no-link-icon > img div.inner > div.right-column-banner > a.no-link-icon > img
www.uw.edu.pl/wp-content/uploads/2026/04/zrzut-ekranu-2026-04-17-o-18.06.26.jpg
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2023/06/idub_logo-1024x459.png
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2026/02/topmarka2025_green-1024x359.jpg
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2019/02/logo_4eu_rgb.png
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2026/02/zdjecie_wyrozniajace_610x405_idub.jpg
div.inner > div.right-column-banner > a > img div.inner > div.right-column-banner > a > img
www.uw.edu.pl/wp-content/uploads/2022/03/hr-excellence.jpg
HR EXCELLENCE IN RESEARCH div.slick-track > div.item > a > img.logo
www.uw.edu.pl/wp-content/uploads/2017/07/logo_excellence1.png
Program IDUB div.slick-track > div.item > a > img.logo
www.uw.edu.pl/wp-content/uploads/2021/09/logo_idub.png
KRASP div.slick-track > div.item > a > img.logo
www.uw.edu.pl/wp-content/uploads/2017/07/logo_krasp1.png
UNICA div.slick-track > div.item > a > img.logo
www.uw.edu.pl/wp-content/uploads/2017/07/logo_unica1.png
EAEC div.slick-track > div.item > a > img.logo
www.uw.edu.pl/wp-content/uploads/2017/07/logo_eaec1.png
HR EXCELLENCE IN RESEARCH div.slick-track > div.item > a > img.logo
www.uw.edu.pl/wp-content/uploads/2017/07/logo_excellence1.png
Program IDUB div.slick-track > div.item > a > img.logo
www.uw.edu.pl/wp-content/uploads/2021/09/logo_idub.png
Logo Uniwersytet Warszawski - strona główna section.mid-bar > div.logo > a > img
www.uw.edu.pl/wp-content/uploads/2017/07/logo-2-11.png
Krajowy Plan Odbudowy i Zwiększania Odporności div.slick-track > div.item > a > img.logo
/wp-content/uploads/2024/07/znak_kpo_poziom_web_linie2-e1...
Fundusze Europejskie na Infrastrukturę, Klimat, Środowisko div.slick-track > div.item > a > img.logo
www.uw.edu.pl/wp-content/uploads/2025/12/feniks_kontra-1.png
Krajowy Plan Odbudowy i Zwiększania Odporności div.slick-track > div.item > a > img.logo
/wp-content/uploads/2024/07/znak_kpo_poziom_web_linie2-e1...
Fundusze Europejskie na Infrastrukturę, Klimat, Środowisko div.slick-track > div.item > a > img.logo
www.uw.edu.pl/wp-content/uploads/2025/12/feniks_kontra-1.png
Erasmus Plus div.slick-track > div.item > a > img.logo
/wp-content/uploads/2019/08/eu-flag-erasmus_vect_pos-bw-e...
Erasmus Plus div.slick-track > div.item > a > img.logo
/wp-content/uploads/2019/08/eu-flag-erasmus_vect_pos-bw-e...
Fundusze Europejskie dla Rozwoju Społecznego div.slick-track > div.item > a > img.logo
/wp-content/uploads/2024/07/fe_dla_rozwoju_spolecznego_we...
Ministerstwo Edukacji i Nauki div.slick-track > div.item > a > img.logo
/wp-content/uploads/2022/11/04_znak_podstawowy_mono_ciemn...
Fundusze Europejskie dla Rozwoju Społecznego div.slick-track > div.item > a > img.logo
/wp-content/uploads/2024/07/fe_dla_rozwoju_spolecznego_we...
Fundusze Europejskie dla Nowoczesnej Gospodarki div.slick-track > div.item > a > img.logo
/wp-content/uploads/2024/07/fe_dla_nowoczesnej_gospodarki...
Fundusze Europejskie dla Nowoczesnej Gospodarki div.slick-track > div.item > a > img.logo
/wp-content/uploads/2024/07/fe_dla_nowoczesnej_gospodarki...
Program wieloletni Uniwersytetu Warszawskiego 2016-2027 section.top-bar > div.top-flags > span > img
www.uw.edu.pl/wp-content/themes/uw/library/img/flag_pl.png
Fundusze europejskie - Programy ramowe Unii Europejskiej section.top-bar > div.top-flags > a > img
www.uw.edu.pl/wp-content/themes/uw/library/img/flaga_UE_pl_2024.png

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

●Max Potential First Input Delay 90 ms
●Optimize DOM size
●Optimize viewport for mobile
●Minify CSS
●User Timing marks and measures 6 user timings
●JavaScript execution time 0.6 s
●Minimizes main-thread work 1.7 s
●Avoid long main-thread tasks 2 long tasks found
●Avoid non-composited animations 41 animated elements found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 150 ms
●Server Backend Latencies 70 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 510 ms
○INP breakdown
87

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.

ARIA

When an input field doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn more about input field labels.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Fundusze Europejskie dla Nowoczesnej Gospodarki div.patrons-slider > div.js-patrons-slider > div.slick-list > div.slick-track

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

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
REKRUTACJA div.menu-column-right > ul#menu-stopka-prawa-kolumna > li#menu-item-41715 > a
PRACA NA UW div.menu-column-right > ul#menu-stopka-prawa-kolumna > li#menu-item-52198 > a
MUZEUM UW div.menu-column-right > ul#menu-stopka-prawa-kolumna > li#menu-item-85301 > a
ZWIEDZANIE KAMPUSU div.menu-column-right > ul#menu-stopka-prawa-kolumna > li#menu-item-41684 > a
PISMO UCZELNI div.menu-column-right > ul#menu-stopka-prawa-kolumna > li#menu-item-41685 > a
DEKLARACJA DOSTĘPNOŚCI div.menu-column-right > ul#menu-stopka-prawa-kolumna > li#menu-item-83095 > a
Zapisz się do newslettera div.inner > div.spacer > div.inner > a.newsletter-button
Czytaj więcej o plikach „cookies” body.home > div#cookie-law-info-bar > span > a#CONSTANT_OPEN_URL
Akceptuję body.home > div#cookie-law-info-bar > span > a#CONSTANT_OPEN_URL

These are opportunities to improve the legibility of your content.

Names and labels

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
nav#main-menu > ul#menu-glowne-menu > li#menu-item-41671 > a nav#main-menu > ul#menu-glowne-menu > li#menu-item-41671 > a
div.spacer > div.inner > div.right-column-banner > a div.spacer > div.inner > div.right-column-banner > a
div.spacer > div.inner > div.right-column-banner > a div.spacer > div.inner > div.right-column-banner > a
div.spacer > div.inner > div.right-column-banner > a div.spacer > div.inner > div.right-column-banner > a
div.spacer > div.inner > div.right-column-banner > a div.spacer > div.inner > div.right-column-banner > a
div.spacer > div.inner > div.right-column-banner > a div.spacer > div.inner > div.right-column-banner > a
div.spacer > div.inner > div.right-column-banner > a div.spacer > div.inner > div.right-column-banner > a
div.spacer > div.inner > div.right-column-banner > a div.spacer > div.inner > div.right-column-banner > a
div.spacer > div.inner > div.right-column-banner > a div.spacer > div.inner > div.right-column-banner > a
div.spacer > div.inner > div.right-column-banner > a.no-link-icon div.spacer > div.inner > div.right-column-banner > a.no-link-icon
div.spacer > div.inner > div.right-column-banner > a div.spacer > div.inner > div.right-column-banner > a
div.spacer > div.inner > div.right-column-banner > a div.spacer > div.inner > div.right-column-banner > 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
A ul.nav > li.mobile-hide1 > p.size > a.size1
Pełny widok kalendarza div.section-content > div.left > div.new-event > 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
●Buttons have an accessible name
●Image elements have `[alt]` attributes
●`[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
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●ARIA toggle fields have accessible names
●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
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Elements with visible text labels have matching accessible names.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` 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 `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
○Form elements have associated labels
○Links are distinguishable without relying on color.
○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>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Identical links have the same purpose.
○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

General

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
/c01d0246d79eba64b8a7cca07e5b7dc7.gif?puid=da64984f-1826-...
Failed to load resource: net::ERR_TOO_MANY_REDIRECTS
/map/ct=y/c=9193/tp=SHLC/tpid=03ddc136-f784-43c2-a005-a9a...
Failed to load resource: the server responded with a status of 400 ()
●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 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
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.

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

Crawling and Indexing

Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
div.cli-row > div.cli-col-12 > div.cli-privacy-overview > a.cli-privacy-readmore div.cli-row > div.cli-col-12 > div.cli-privacy-overview > a.cli-privacy-readmore

To appear in search results, crawlers need access to your app.

○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
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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