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https://muni.cz

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
2
PASS
6
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
71
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.33 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

5.28 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

11 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.007

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

1.68 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

5.30 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
6 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
4.7 MB transferred, 43 requests
FIX
4.7 MB transferred, 43 requests
Critical::
Page weighs 6.7 MB (4.7 MB transferred)
Warning::
Images are 3.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.6 MB
Warning::
JavaScript is 776 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 776 KB
Info::
Fonts are 302 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 302 KB
Info::
43 HTTP requests
Info::
Estimated 0.99 g CO2 per page load
4.7 MB / 2.4 MB budget
4.7 MB transferred
43 requests
0.99 g CO2 per page load
Images 3.6 MiB 76%
JavaScript 775.7 KiB 16%
Fonts 302.5 KiB 6%
CSS 63.4 KiB 1%
HTML 22.4 KiB 0%
Other 1.7 KiB 0%
Other 1.4 KiB 0%
Other 550 B 0%
Other 227 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (4.7 MiB of 4.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
11 scripts, 354 KB unused
FIX
11 scripts, 354 KB unused
Warning::
https://cdn.muni.cz/css/MuniWeb/_Shared/muniweb.3b...: 80 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DEY8...: 68 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5LQ...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-000...: 65 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/fbevents.js: 44 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 354 KB
354 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.muni.cz/css/MuniWeb/_Shared/muniweb.3b230ca2cb814a440239.js111 KB80 KB (73%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-DEY88JHR1N&cx=c&gtm=4e64k1h2168 KB68 KB (40%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5LQKVJ155 KB67 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-000000000&cx=c&gtm=4e64k1h2134 KB65 KB (48%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB44 KB (46%)✓3rd
https://c.seznam.cz/js/rc.js47 KB30 KB (64%)✓3rd
https://analytics.ics.muni.cz:3500/matomo.js22 KB—✓3rd
https://cdn.muni.cz/Scripts/libs/muni-cookies/main.js5 KB—✓3rd
https://www.clarity.ms/tag/ku57fhseug1 KB—✓3rd
https://scripts.clarity.ms/0.8.59/clarity.js26 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

D
Page Weight Inventory
Action
43 resources · 4.7 MB · 354 KB savings available
FIX
43 resources · 4.7 MB · 354 KB savings available
Warning::
Page weight 3.7 MB over 1MB target
Got: 4.7 MB Expected: ≤ 1 MB
Info::
~354 KB of savings available
Warning::
42 third-party resources (100% of weight)
Info::
2 resources over 200KB
43 resources · 4.7 MiB · 42 third-party 3.7 MiB over 1MB target
Image 76% · 3.6 MiB
JavaScript 16% · 775.7 KiB
Font 6% · 302.5 KiB
CSS 1% · 63.4 KiB
Document 0% · 23.2 KiB
Other 0% · 2.1 KiB

~353.7 KiB of savings available

Remove unused JavaScript: 353.7 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
17 images, 0 KB saveable
REVIEW
17 images, 0 KB saveable
Warning::
https://cdn.muni.cz/media/rss/36736-holky.jpg?mode... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.muni.cz/media/rss/36715-20260331_majal... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.muni.cz/media/3796231/ll-0393.jpg?mode... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.muni.cz/media/4120074/_jobnest_.png?mo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.muni.cz/media/rss/36659-BAW1_tit.jpg?m... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.muni.cz/media/rss/36767-chile_memorand... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.muni.cz/media/3727342/banner.jpg?mode=... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.muni.cz/media/3727340/studenti.jpg?mod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.muni.cz/media/3328776/odklizeni.jpg?mo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
17 images 3.6 MB
0 oversized -0 KB
16 legacy format
9 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
JS Execution Cost
471ms total JS execution
PASS
471ms total JS execution
Info::
https://www.muni.cz/: 162ms CPU time
Info::
Unattributable: 74ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-5LQ...: 68ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-DEY8...: 63ms CPU time
Info::
https://scripts.clarity.ms/0.8.59/clarity.js: 54ms CPU time
Warning::
Third-party scripts: 471ms (100% of total)

Main Thread Breakdown

Script Evaluation 50% Other 18% Style & Layout 14% Script Parsing & Compilation 10% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.muni.cz/162ms23ms2ms3rd
Unattributable74ms4ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5LQKVJ68ms55ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=G-DEY88JHR1N&cx=c&gtm=4e64k1h263ms50ms12ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js54ms47ms2ms3rd
https://cdn.muni.cz/css/MuniWeb/_Shared/muniweb.3b230ca2cb814a440239.js52ms23ms9ms3rd
A+
Font Loading
4 fonts (302 KB)
PASS
4 fonts (302 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

302 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.3 s LCP 5.3 shttps://cdn.muni.cz/css/MuniWeb/fonts/fa-light-300.48d5b0cddbcd5e718388.woff2fa-light-300.48d5b0cddb... https://cdn.muni.cz/css/MuniWeb/fonts/fa-light-300.48d5b0cddbcd5e718388.woff2 — 156.2 KiB — 235 ms — font-display: swaphttps://cdn.muni.cz/css/MuniWeb/fonts/muni-bold-webfont.86c30c8e30c009d7e938.woff2muni-bold-webfont.86c30... https://cdn.muni.cz/css/MuniWeb/fonts/muni-bold-webfont.86c30c8e30c009d7e938.woff2 — 10.0 KiB — 129 ms — font-display: swaphttps://cdn.muni.cz/css/MuniWeb/fonts/fa-brands-400.878f31251d960bd6266f.woff2fa-brands-400.878f31251... https://cdn.muni.cz/css/MuniWeb/fonts/fa-brands-400.878f31251d960bd6266f.woff2 — 107.8 KiB — 51 ms — font-display: swaphttps://cdn.muni.cz/css/MuniWeb/fonts/academicons.ce68780d668568976108.woff2academicons.ce68780d668... https://cdn.muni.cz/css/MuniWeb/fonts/academicons.ce68780d668568976108.woff2 — 28.4 KiB — 84 ms — font-display: swap
fa-light-300.48d5b0cddb... woff2 swap
Size 156 KB
Load time 235 ms
Start 783 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
muni-bold-webfont.86c30... woff2 swap
Size 10 KB
Load time 129 ms
Start 784 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.878f31251... woff2 swap
Size 108 KB
Load time 51 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
academicons.ce68780d668... woff2 swap
Size 28 KB
Load time 84 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~132 KB and ~264 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
43 requests over 3216ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.3 s LCP 5.3 shttps://muni.cz// https://muni.cz/ — 301 — 200 B — 121 ms — http/1.1https://www.muni.cz/www.muni.cz/ https://www.muni.cz/ — 200 — 22.4 KiB — 416 ms — http/1.1https://cdn.muni.cz/css/MuniWeb/MUNI/style.c812e5053c8c0bcbed98.csscdn.muni.cz/css/MuniWeb/MUNI/style.... https://cdn.muni.cz/css/MuniWeb/MUNI/style.c812e5053c8c0bcbed98.css — 200 — 63.4 KiB — 195 ms — http/1.1https://cdn.muni.cz/media/3818569/prijimacky-na-masarykovu-univerzitu-studuj-na-muni.jpg?mode=crop&center=0.5,0.5&rnd=133864343310000000&heightratio=0.5&width=278cdn.muni.cz/media/3818569/prijimack... https://cdn.muni.cz/media/3818569/prijimacky-na-masarykovu-univerzitu-studuj-na-muni.jpg?mode=crop&center=0.5,0.5&rnd=133864343310000000&heightratio=0.5&width=278 — 200 — 10.9 KiB — 174 ms — http/1.1https://cdn.muni.cz/media/3928807/tsp-na-necisto-student-premysli-nad-testem.png?mode=crop&center=0.39,0.52&rnd=134031755860000000&heightratio=0.5&width=278cdn.muni.cz/media/3928807/tsp-na-ne... https://cdn.muni.cz/media/3928807/tsp-na-necisto-student-premysli-nad-testem.png?mode=crop&center=0.39,0.52&rnd=134031755860000000&heightratio=0.5&width=278 — 200 — 105.7 KiB — 204 ms — http/1.1https://cdn.muni.cz/media/3016087/img_3624.jpg?mode=crop&center=0.5,0.5&rnd=131562340670000000&heightratio=0.5&width=278cdn.muni.cz/media/3016087/img_3624.... https://cdn.muni.cz/media/3016087/img_3624.jpg?mode=crop&center=0.5,0.5&rnd=131562340670000000&heightratio=0.5&width=278 — 200 — 15.2 KiB — 50 ms — http/1.1https://cdn.muni.cz/media/4120074/_jobnest_.png?mode=crop&center=0.5,0.5&rnd=134187511550000000&width=400cdn.muni.cz/media/4120074/_jobnest_... https://cdn.muni.cz/media/4120074/_jobnest_.png?mode=crop&center=0.5,0.5&rnd=134187511550000000&width=400 — 200 — 7.3 KiB — 54 ms — http/1.1https://cdn.muni.cz/media/rss/36753-dobrovolnici_titulka.png?mode=crop&heightratio=0.5&width=575cdn.muni.cz/media/rss/36753-dobrovo... https://cdn.muni.cz/media/rss/36753-dobrovolnici_titulka.png?mode=crop&heightratio=0.5&width=575 — 200 — 187.5 KiB — 121 ms — http/1.1https://cdn.muni.cz/css/MuniWeb/_Shared/muniweb.3b230ca2cb814a440239.jscdn.muni.cz/css/MuniWeb/_Shared/mun... https://cdn.muni.cz/css/MuniWeb/_Shared/muniweb.3b230ca2cb814a440239.js — 200 — 110.9 KiB — 129 ms — http/1.1https://cdn.muni.cz/media/rss/36659-BAW1_tit.jpg?mode=crop&heightratio=0.5&width=278cdn.muni.cz/media/rss/36659-BAW1_ti... https://cdn.muni.cz/media/rss/36659-BAW1_tit.jpg?mode=crop&heightratio=0.5&width=278 — 200 — 14.7 KiB — 96 ms — http/1.1https://cdn.muni.cz/media/rss/36715-20260331_majales_kral_kralovna_2-1.jpg?mode=crop&heightratio=0.5&width=278cdn.muni.cz/media/rss/36715-2026033... https://cdn.muni.cz/media/rss/36715-20260331_majales_kral_kralovna_2-1.jpg?mode=crop&heightratio=0.5&width=278 — 200 — 16.2 KiB — 163 ms — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-5LQKVJwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-5LQKVJ — 200 — 155.3 KiB — 151 ms — h2https://analytics.ics.muni.cz:3500/matomo.jsanalytics.ics.muni.cz:3500/matomo.j... https://analytics.ics.muni.cz:3500/matomo.js — 200 — 21.9 KiB — 457 ms — http/1.1https://cdn.muni.cz/media/rss/36767-chile_memorandum.jpg?mode=crop&heightratio=0.5&width=278cdn.muni.cz/media/rss/36767-chile_m... https://cdn.muni.cz/media/rss/36767-chile_memorandum.jpg?mode=crop&heightratio=0.5&width=278 — 200 — 17.0 KiB — 123 ms — http/1.1https://cdn.muni.cz/media/rss/36736-holky.jpg?mode=crop&heightratio=0.5&width=278cdn.muni.cz/media/rss/36736-holky.j... https://cdn.muni.cz/media/rss/36736-holky.jpg?mode=crop&heightratio=0.5&width=278 — 200 — 15.3 KiB — 103 ms — http/1.1https://cdn.muni.cz/media/4119707/dsc03413-kopie.png?mode=crop&center=0.49,0.47&rnd=134187353950000000&upscale=false&width=1600&height=777cdn.muni.cz/media/4119707/dsc03413-... https://cdn.muni.cz/media/4119707/dsc03413-kopie.png?mode=crop&center=0.49,0.47&rnd=134187353950000000&upscale=false&width=1600&height=777 — 200 — 2.7 MiB — 387 ms — http/1.1https://cdn.muni.cz/css/MuniWeb/fonts/fa-light-300.48d5b0cddbcd5e718388.woff2cdn.muni.cz/css/MuniWeb/fonts/fa-li... https://cdn.muni.cz/css/MuniWeb/fonts/fa-light-300.48d5b0cddbcd5e718388.woff2 — 200 — 156.2 KiB — 235 ms — http/1.1https://cdn.muni.cz/css/MuniWeb/fonts/muni-bold-webfont.86c30c8e30c009d7e938.woff2cdn.muni.cz/css/MuniWeb/fonts/muni-... https://cdn.muni.cz/css/MuniWeb/fonts/muni-bold-webfont.86c30c8e30c009d7e938.woff2 — 200 — 10.0 KiB — 129 ms — http/1.1https://cdn.muni.cz/media/3727342/banner.jpg?mode=crop&center=0.28,0.48&rnd=133699196680000000&heightratio=0.5&width=278cdn.muni.cz/media/3727342/banner.jp... 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
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www.muni.cz
Other
Optional
Execution 162ms
Transfer 22 KB
Monthly Cost Kč20/mo
Unattributable
Other
Optional
Execution 74ms
Transfer 0 KB
Monthly Cost Kč9/mo
Google Tag Manager
Tag Manager
Optional
Execution 68ms
Transfer 155 KB
Unused 43%
Monthly Cost Kč8/mo
Google Tag Manager
Tag Manager
Optional
Execution 63ms
Transfer 168 KB
Unused 40%
Monthly Cost Kč8/mo
Microsoft Clarity
Session Replay
Optional
Execution 54ms
Transfer 26 KB
Monthly Cost Kč7/mo
cdn.muni.cz
Other
Optional
Execution 52ms
Transfer 111 KB
Unused 73%
Monthly Cost Kč6/mo

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

73% of cdn.muni.cz's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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