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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.

46

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.

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
cdn.muni.cz/css/MuniWeb/fonts/fa-light-300.48d5b0cddbcd5e718388.woff2155 ms
cdn.muni.cz/css/MuniWeb/fonts/fa-brands-400.878f31251d960bd6266f.woff255 ms
cdn.muni.cz/css/MuniWeb/fonts/muni-bold-webfont.86c30c8e30c009d7e938.woff250 ms
cdn.muni.cz/css/MuniWeb/fonts/academicons.ce68780d668568976108.woff245 ms

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
body > main#main > div.box-hero-header > div.box-hero-header__img body > main#main > div.box-hero-header > div.box-hero-header__img
/media/4119707/dsc03413-kopie.png?mode=crop&center=0.49,0...871.0 KiB806.3 KiB
Dva dobrovolnické příběhy, které začaly na MU article.box-article-grid > a.box-article-grid__inner > p.box-article-grid__img > img
/media/rss/36753-dobrovolnici_titulka.png?mode=crop&heigh...283.0 KiB246.7 KiB
main#main > div.row-main > div.box-hero > div.box-hero__img main#main > div.row-main > div.box-hero > div.box-hero__img
/media/3731307/upr-lightbox.png?mode=crop&center=0.41,0.5...222.1 KiB200.0 KiB
MUNI POMÁHÁ div.grid > div.grid__cell > div.image > img
/media/3328776/odklizeni.jpg?mode=crop&center=0.39,0.38&r...41.6 KiB23.0 KiB
Brno Art Week se letos zaměří na „odolnost“ article.box-article-grid > a.box-article-grid__inner > p.box-article-grid__img > img
cdn.muni.cz/media/rss/36659-BAW1_tit.jpg?mode=crop&heightratio=0.5&width=47734.7 KiB16.2 KiB
O majálesový trůn za MU bojují Gabča a Richard article.box-article-grid > a.box-article-grid__inner > p.box-article-grid__img > img
/media/rss/36715-20260331_majales_kral_kralovna_2-1.jpg?m...33.8 KiB15.3 KiB
Budoucí studenti div.grid__cell > div.image > a > img
/media/3727342/banner.jpg?mode=crop&center=0.28,0.48&rnd=...31.1 KiB12.5 KiB
Veřejnost div.grid > div.grid__cell > div.image > img
/media/3796231/ll-0393.jpg?mode=crop&center=0.31,0.52&rnd...31.1 KiB12.5 KiB
Studenti div.grid > div.grid__cell > div.image > img
/media/3727965/studenti.jpg?mode=crop&center=0.29,0.49&rn...24.1 KiB5.7 KiB

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-0-DIV
nodeLabel: body > main#main > div.box-hero-header > div.box-hero-header__img
path: 4,HTML,2,BODY,2,MAIN,1,DIV,0,DIV
selector: body > main#main > div.box-hero-header > div.box-hero-header__img
snippet: <div class="box-hero-header__img bg-img1 box-hero-header__img--scaled">

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
cdn.muni.cz/css/MuniWeb/MUNI/style.c812e5053c8c0bcbed98.csshttp/1.1
/media/3818569/prijimacky-na-masarykovu-univerzitu-studuj...http/1.1
/media/3928807/tsp-na-necisto-student-premysli-nad-testem...http/1.1
/media/3016087/img_3624.jpg?mode=crop&center=0.5,0.5&rnd=...http/1.1
/media/4120074/_jobnest_.png?mode=crop&center=0.5,0.5&rnd...http/1.1
/media/rss/36753-dobrovolnici_titulka.png?mode=crop&heigh...http/1.1
cdn.muni.cz/media/rss/36659-BAW1_tit.jpg?mode=crop&heightratio=0.5&width=477http/1.1
/media/rss/36715-20260331_majales_kral_kralovna_2-1.jpg?m...http/1.1
/media/rss/36767-chile_memorandum.jpg?mode=crop&heightrat...http/1.1
cdn.muni.cz/media/rss/36736-holky.jpg?mode=crop&heightratio=0.5&width=477http/1.1
/media/3727342/banner.jpg?mode=crop&center=0.28,0.48&rnd=...http/1.1
/media/3727965/studenti.jpg?mode=crop&center=0.29,0.49&rn...http/1.1
/media/3796231/ll-0393.jpg?mode=crop&center=0.31,0.52&rnd...http/1.1
/media/3328776/odklizeni.jpg?mode=crop&center=0.39,0.38&r...http/1.1
cdn.muni.cz/css/MuniWeb/_Shared/muniweb.3b230ca2cb814a440239.jshttp/1.1
cdn.muni.cz/Scripts/libs/muni-cookies/main.jshttp/1.1
/media/4119707/dsc03413-kopie.png?mode=crop&center=0.49,0...http/1.1
/media/3731307/upr-lightbox.png?mode=crop&center=0.41,0.5...http/1.1
cdn.muni.cz/css/MuniWeb/fonts/fa-light-300.48d5b0cddbcd5e718388.woff2http/1.1
cdn.muni.cz/css/MuniWeb/fonts/muni-bold-webfont.86c30c8e30c009d7e938.woff2http/1.1
cdn.muni.cz/css/MuniWeb/fonts/fa-brands-400.878f31251d960bd6266f.woff2http/1.1
/redakce/api/cookiesapi/GetInitialConfig?key=1381a542-454...http/1.1
cdn.muni.cz/css/MuniWeb/fonts/academicons.ce68780d668568976108.woff2http/1.1
cdn.muni.cz/Scripts/libs/muni-cookies/cookies-muniweb-cs.jshttp/1.1
cdn.muni.cz/media/3722237/m_bile.icohttp/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
cdn.muni.cz/css/MuniWeb/MUNI/style.c812e5053c8c0bcbed98.css63.4 KiB1.2 s

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
connect.facebook.net/en_US/fbevents.js1200.0 s99.4 KiB
c.seznam.cz/js/rc.js3600.0 s47.3 KiB
analytics.ics.muni.cz:3500/matomo.js0.0 ms21.9 KiB
scripts.clarity.ms/0.8.59/clarity.js86400.0 s26.2 KiB
cdn.muni.cz/Scripts/libs/muni-cookies/cookies-muniweb-cs.js86400.0 s9.4 KiB
cdn.muni.cz/Scripts/libs/muni-cookies/main.js86400.0 s5.1 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: 861 ms
URLTime Spent
muni.cz/861 ms
www.muni.cz/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

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: 370 ms 58.4 KiB
URLTransfer SizeEst Savings
cdn.muni.cz/css/MuniWeb/MUNI/style.c812e5053c8c0bcbed98.css62.8 KiB58.4 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: 750 ms 353.5 KiB
URLTransfer SizeEst Savings
cdn.muni.cz/css/MuniWeb/_Shared/muniweb.3b230ca2cb814a440239.js110.0 KiB80.5 KiB
www.googletagmanager.com/gtag/js?id=G-DEY88JHR1N&cx=c&gtm=4e64k0h1168.3 KiB67.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-5LQKVJ154.9 KiB66.8 KiB
www.googletagmanager.com/gtag/js?id=AW-000000000&cx=c&gtm=4e64k0h1134.0 KiB64.7 KiB
connect.facebook.net/en_US/fbevents.js96.5 KiB44.2 KiB
c.seznam.cz/js/rc.js46.8 KiB29.4 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTotal CPU TimeScript EvaluationScript Parse
www.muni.cz/463 ms106 ms6.0 ms
Unattributable327 ms18 ms0.0 ms
www.googletagmanager.com/gtm.js?id=GTM-5LQKVJ311 ms256 ms50 ms
www.googletagmanager.com/gtag/js?id=G-DEY88JHR1N&cx=c&gtm=4e64k0h1300 ms241 ms58 ms
cdn.muni.cz/css/MuniWeb/_Shared/muniweb.3b230ca2cb814a440239.js254 ms112 ms44 ms
scripts.clarity.ms/0.8.59/clarity.js238 ms207 ms11 ms
www.googletagmanager.com/gtag/js?id=AW-000000000&cx=c&gtm=4e64k0h1209 ms165 ms43 ms
connect.facebook.net/en_US/fbevents.js155 ms116 ms38 ms
c.seznam.cz/js/rc.js104 ms83 ms18 ms

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
Script Evaluation1.5 s
Other378 ms
Style & Layout289 ms
Script Parsing & Compilation279 ms
Rendering70 ms
Parse HTML & CSS55 ms
Garbage Collection34 ms

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
/media/4119707/dsc03413-kopie.png?mode=crop&center=0.49,0...871.8 KiB
/media/rss/36753-dobrovolnici_titulka.png?mode=crop&heigh...283.8 KiB
/media/3928807/tsp-na-necisto-student-premysli-nad-testem...283.7 KiB
/media/3731307/upr-lightbox.png?mode=crop&center=0.41,0.5...222.9 KiB
www.googletagmanager.com/gtag/js?id=G-DEY88JHR1N&cx=c&gtm=4e64k0h1168.3 KiB
cdn.muni.cz/css/MuniWeb/fonts/fa-light-300.48d5b0cddbcd5e718388.woff2156.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-5LQKVJ155.2 KiB
www.googletagmanager.com/gtag/js?id=AW-000000000&cx=c&gtm=4e64k0h1134.0 KiB
cdn.muni.cz/css/MuniWeb/_Shared/muniweb.3b230ca2cb814a440239.js110.9 KiB
cdn.muni.cz/css/MuniWeb/fonts/fa-brands-400.878f31251d960bd6266f.woff2107.8 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
Brno Art Week se letos zaměří na „odolnost“ article.box-article-grid > a.box-article-grid__inner > p.box-article-grid__img > img
cdn.muni.cz/media/rss/36659-BAW1_tit.jpg?mode=crop&heightratio=0.5&width=477
O majálesový trůn za MU bojují Gabča a Richard article.box-article-grid > a.box-article-grid__inner > p.box-article-grid__img > img
/media/rss/36715-20260331_majales_kral_kralovna_2-1.jpg?m...
Budoucí studenti div.grid__cell > div.image > a > img
/media/3727342/banner.jpg?mode=crop&center=0.28,0.48&rnd=...
Studenti div.grid > div.grid__cell > div.image > img
/media/3727340/studenti.jpg?mode=crop&center=0.29,0.49&rn...
Veřejnost div.grid > div.grid__cell > div.image > img
/media/3796231/ll-0393.jpg?mode=crop&center=0.31,0.52&rnd...
MUNI POMÁHÁ div.grid > div.grid__cell > div.image > img
/media/3328776/odklizeni.jpg?mode=crop&center=0.39,0.38&r...
Bez popisku div.row-main > div.box-hero-header__content-inner > p.image > img
/media/4120074/_jobnest_.png?mode=crop&center=0.5,0.5&rnd...

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

●Layout shift culprits
●Optimize DOM size
●Forced reflow
●LCP breakdown
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 5 user timings
●Avoid long main-thread tasks 11 long tasks found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 100 ms
●Server Backend Latencies 330 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 370 ms
●Avoid large layout shifts 2 layout shifts found
○INP breakdown
○Avoid non-composited animations
90

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

Focusable descendents within an `[aria-hidden="true"]` element prevent those interactive elements from being available to users of assistive technologies like screen readers. Learn how `aria-hidden` affects focusable elements.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
nav.menu-mobile > ul.menu-mobile__list > li.menu-mobile__item > a.menu-mobile__link nav.menu-mobile > ul.menu-mobile__list > li.menu-mobile__item > a.menu-mobile__link
div.grid > div.grid__cell > div.footer__menu__title > a.footer__menu__title__toggle div.grid > div.grid__cell > div.footer__menu__title > a.footer__menu__title__toggle
div.grid > div.grid__cell > div.footer__menu__title > a.footer__menu__title__toggle div.grid > div.grid__cell > div.footer__menu__title > a.footer__menu__title__toggle
div.grid > div.grid__cell > div.footer__menu__title > a.footer__menu__title__toggle div.grid > div.grid__cell > div.footer__menu__title > a.footer__menu__title__toggle
div.grid > div.grid__cell > div.footer__menu__title > a.footer__menu__title__toggle div.grid > div.grid__cell > div.footer__menu__title > a.footer__menu__title__toggle
div.grid > div.grid__cell > div.footer__menu__title > a.footer__menu__title__toggle div.grid > div.grid__cell > div.footer__menu__title > a.footer__menu__title__toggle

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.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Konference státní správy a neziskových organizací div.row-main > div.box-hero-header__content-inner > div.white > h3

These are opportunities to improve keyboard navigation in your application.

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.menu-mobile > ul.menu-mobile__list > li.menu-mobile__item > a.menu-mobile__link

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.

○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●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.
●`[accesskey]` values are unique
●ARIA attributes are used as specified for the element's role
●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
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●Touch targets have sufficient size and spacing.
●Skip links are focusable.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○`[role]`s are contained by their required parent element
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○Buttons have an accessible name
○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.
○No element has a `[tabindex]` value greater than 0
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<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.
○Elements with visible text labels have matching accessible names.
○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
c.seznam.cz/retargeting?id=000000000&url=https%3A%2F%2Fwww.muni.cz%2F&consent=0
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
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Use a strong HSTS policy
○Mitigate clickjacking with XFO or CSP
92

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.

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

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