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https://cuni.cz

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
53
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
81
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

17.07 s

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

47.14 s

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

147 ms

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

0.041

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

29.93 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.

48.13 s

Page Load Progression

4.7 s
9.5 s
14.2 s
19.0 s
23.7 s
28.5 s
33.2 s
37.9 s
Checks
17
8 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
7.9 MB transferred, 102 requests
FIX
7.9 MB transferred, 102 requests
Critical::
Page weighs 13.8 MB (7.9 MB transferred)
Warning::
Images are 5.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.3 MB
Warning::
JavaScript is 2.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.1 MB
Info::
CSS is 201 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 201 KB
Warning::
102 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.7 g CO2 per page load
7.9 MB / 2.4 MB budget
7.9 MB transferred
102 requests
1.7 g CO2 per page load
Images 5.3 MiB 67%
JavaScript 2.1 MiB 26%
CSS 201.0 KiB 2%
Fonts 180.2 KiB 2%
HTML 128.7 KiB 2%
Other 2.4 KiB 0%
Other 849 B 0%
Other 478 B 0%
Other 0 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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
JS Execution Cost
Action
3454ms total JS execution
FIX
3454ms total JS execution
Warning::
https://cuni.cz/: 1812ms CPU time
Warning::
Unattributable: 1126ms CPU time
Info::
https://cuni.cz/sablona/dist/js/jquery-3.7.1.min.j...: 213ms CPU time
Info::
https://atlas.is.cuni.cz/matomo/js/container_CPOJR...: 167ms CPU time
Info::
https://cuni.cz/sablona/dist/js/jquery-ui.min.js: 82ms CPU time
Info::
Third-party scripts: 1293ms (37% of total)

Main Thread Breakdown

Other 48% Style & Layout 18% Rendering 14% Script Evaluation 12% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
https://cuni.cz/1812ms48ms2ms1st
Unattributable1126ms31ms0ms3rd
https://cuni.cz/sablona/dist/js/jquery-3.7.1.min.js213ms164ms12ms1st
https://atlas.is.cuni.cz/matomo/js/container_CPOJRu6k.js167ms113ms40ms3rd
https://cuni.cz/sablona/dist/js/jquery-ui.min.js82ms45ms35ms1st
https://cuni.cz/sablona/dist/js/cookie-consent.js54ms25ms26ms1st
D
JS Bundles
Action
20 scripts, 470 KB unused
FIX
20 scripts, 470 KB unused
Warning::
https://cuni.cz/sablona/dist/js/jquery-ui.min.js: 223 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://atlas.is.cuni.cz/matomo/js/container_CPOJR...: 99 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cuni.cz/sablona/dist/js/jquery-3.7.1.min.j...: 58 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cuni.cz/sablona/dist/js/altcha.min.js: 49 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cuni.cz/sablona/dist/js/bundle.js?v=2026.0...: 41 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 470 KB
470 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cuni.cz/sablona/dist/js/jquery-ui.min.js250 KB223 KB (89%)✓1st
https://atlas.is.cuni.cz/matomo/js/container_CPOJRu6k.js253 KB99 KB (39%)✓3rd
https://cuni.cz/sablona/dist/js/jquery-3.7.1.min.js86 KB58 KB (68%)✓1st
https://cuni.cz/sablona/dist/js/altcha.min.js66 KB49 KB (75%)✓1st
https://cuni.cz/sablona/dist/js/bundle.js?v=2026.04.16.1771 KB41 KB (58%)✓1st
https://www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js436 KB—✓3rd
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=r78Drb146 KB—✓3rd
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=root,base193 KB—✓3rd
https://www.youtube.com/s/player/218d9d92/player_embed_es6.vflset/en_US/base.js436 KB—✓3rd
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=root,base0 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
102 resources · 7.9 MB · 470 KB savings available
FIX
102 resources · 7.9 MB · 470 KB savings available
Warning::
Page weight 6.9 MB over 1MB target
Got: 7.9 MB Expected: ≤ 1 MB
Info::
~470 KB of savings available
Info::
42 third-party resources (24% of weight)
Info::
11 resources over 200KB
102 resources · 7.9 MiB · 42 third-party 6.9 MiB over 1MB target
Image 67% · 5.3 MiB
JavaScript 26% · 2.1 MiB
CSS 2% · 201.0 KiB
Font 2% · 180.2 KiB
Document 2% · 128.8 KiB
Other 0% · 1.3 KiB

~469.9 KiB of savings available

Remove unused JavaScript: 469.9 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store, no-cache, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store, no-cache, must-revalidate

DirectiveValueMeaning
no-store—Never cache this response
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
C
Image Optimization
Action
50 images, 0 KB saveable
REVIEW
50 images, 0 KB saveable
Warning::
https://cuni.cz/AKTUALITY-29275-version1-afoto_new... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/AKTUALITY-29217-version1-afoto_new... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/UK-15738-version1-afoto_new.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/UK-15646-version1-afoto_new.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/AKTUALITY-29252-version1-afoto_new... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/AKTUALITY-29196-version1-afoto_new... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/AKTUALITY-29166-version1-afoto_new... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/UK-1-version1-afoto2.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/AKTUALITY-29306-version1-afoto_new... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/UK-8990-version1-_vzdelavani21_316... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/UK-15752-version1-afoto_new.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/AKTUALITY-29318-version1-afoto_new... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/AKTUALITY-29305-version1-afoto_new... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/AKTUALITY-29242-version1-afoto_new... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/UK-15772-version1-afoto_new.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/UK-15745-version1-afoto_new.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/UK-15643-version1-afoto_new.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/UK-8990-version1-_logo_strategy_hr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/UK-15737-version1-afoto_new.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/AKTUALITY-29339-version1-afoto_new... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/UK-8990-version1-_4eulogo_1_282_75... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/AKTUALITY-29297-version1-afoto_new... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cuni.cz/AKTUALITY-29208-version1-afoto_new... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
50 images 5.3 MB
0 oversized -0 KB
50 legacy format
23 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

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

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
Third-Party Impact
24% third-party, 0 ms blocking
PASS
24% third-party, 0 ms blocking
Info::
Third-party code accounts for 24% of page weight (1.9 MiB of 7.9 MiB)
Info::
Third-party blocking time is low (0 ms)
76%
24%
First-party Third-party
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+
Font Loading
9 fonts (180 KB)
PASS
9 fonts (180 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

180 KB total

Render-blocking

0

of 9

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s FCP 17.1 s LCP 47.1 shttps://cuni.cz/sablona/dist/fonts/silka-regular-webfont.woff2silka-regular-webfont.w... https://cuni.cz/sablona/dist/fonts/silka-regular-webfont.woff2 — 26.1 KiB — 830 ms — font-display: swaphttps://cuni.cz/sablona/dist/fonts/silka-light-webfont.woff2silka-light-webfont.woff2 https://cuni.cz/sablona/dist/fonts/silka-light-webfont.woff2 — 26.7 KiB — 1.7 s — font-display: swaphttps://cuni.cz/sablona/dist/fonts/silka-bold-webfont.woff2silka-bold-webfont.woff2 https://cuni.cz/sablona/dist/fonts/silka-bold-webfont.woff2 — 27.8 KiB — 2.3 s — font-display: swaphttps://cuni.cz/sablona/dist/fonts/silka-black-webfont.woff2silka-black-webfont.woff2 https://cuni.cz/sablona/dist/fonts/silka-black-webfont.woff2 — 26.9 KiB — 26.4 s — font-display: swaphttps://cuni.cz/sablona/dist/fonts/glyphicons-halflings-regular.woff2glyphicons-halflings-re... https://cuni.cz/sablona/dist/fonts/glyphicons-halflings-regular.woff2 — 17.8 KiB — 31.7 s — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 41 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 15 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3KUBHMdazTgWw.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3KUBHMdazTgWw.woff2 — 21.0 KiB — 6 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3KUBHMdazTgWw.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3KUBHMdazTgWw.woff2 — 0 B — 2 ms — font-display: swap
silka-regular-webfont.w... woff2 swap
Size 26 KB
Load time 830 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
silka-light-webfont.woff2 woff2 swap
Size 27 KB
Load time 1.7 s
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
silka-bold-webfont.woff2 woff2 swap
Size 28 KB
Load time 2.3 s
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
silka-black-webfont.woff2 woff2 swap
Size 27 KB
Load time 26.4 s
Start 7.3 s
Risk FOUT — text flashes from fallback to web font
glyphicons-halflings-re... woff2 swap
Size 18 KB
Load time 31.7 s
Start 7.3 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 41 ms
Start 7.4 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 15 ms
Start 7.4 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 21 KB
Load time 6 ms
Start 8.4 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 2 ms
Start 8.5 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)
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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
—
preload
3
dns-prefetch
—
prefetch
—

3 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
102 requests over 40858ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s FCP 17.1 s LCP 47.1 shttps://cuni.cz// https://cuni.cz/ — 200 — 18.0 KiB — 1.3 s — h2https://cuni.cz/sablona/dist/fonts/silka-regular-webfont.woff2/sablona/dist/fonts/silka-regular-w... https://cuni.cz/sablona/dist/fonts/silka-regular-webfont.woff2 — 200 — 26.1 KiB — 830 ms — h2https://cuni.cz/sablona/dist/fonts/silka-light-webfont.woff2/sablona/dist/fonts/silka-light-web... https://cuni.cz/sablona/dist/fonts/silka-light-webfont.woff2 — 200 — 26.7 KiB — 1.7 s — h2https://cuni.cz/sablona/dist/fonts/silka-bold-webfont.woff2/sablona/dist/fonts/silka-bold-webf... https://cuni.cz/sablona/dist/fonts/silka-bold-webfont.woff2 — 200 — 27.8 KiB — 2.3 s — h2https://cuni.cz/sablona/dist/js/jquery-3.7.1.min.js/sablona/dist/js/jquery-3.7.1.min.j... https://cuni.cz/sablona/dist/js/jquery-3.7.1.min.js — 200 — 85.8 KiB — 3.1 s — 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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
37% of JavaScript execution is third-party
First-party Third-party 1293ms · 253KB · Kč160/mo
Unattributable
Other
Costly
Execution 1126ms
Transfer 0 KB
Monthly Cost Kč139/mo
atlas.is.cuni.cz
Other
Optional
Execution 167ms
Transfer 253 KB
Unused 39%
Monthly Cost Kč21/mo

These scripts may cost more than they're worth

  • Unattributable adds 1126ms and costs ~Kč139/month

Unattributable takes 1126ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

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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