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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
39
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

4.08 s

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

9.73 s

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

1.04 s

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

0.000

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

6.24 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.

9.86 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
17
8 PASS 2 REVIEW 5 FIX
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 (1.4 MiB of 1.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2838ms total JS execution
FIX
2838ms total JS execution
Warning::
https://www.chalmers.se/_next/static/chunks/0rxc34...: 1280ms CPU time
Warning::
Unattributable: 431ms CPU time
Warning::
https://www.chalmers.se/: 378ms CPU time
Info::
https://consent.cookiebot.com/bc2bfc50-f07e-4937-9...: 227ms CPU time
Info::
https://consent.cookiebot.com/uc.js: 204ms CPU time
Warning::
Third-party scripts: 2838ms (100% of total)

Main Thread Breakdown

Script Evaluation 54% Other 15% Script Parsing & Compilation 11% Style & Layout 11% Garbage Collection 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.chalmers.se/_next/static/chunks/0rxc34.8xt2wt.js1280ms1121ms15ms3rd
Unattributable431ms24ms0ms3rd
https://www.chalmers.se/378ms17ms42ms3rd
https://consent.cookiebot.com/bc2bfc50-f07e-4937-9777-a31824946168/cc.js?renew=false&referer=www.chalmers.se&dnt=false&init=false227ms102ms26ms3rd
https://consent.cookiebot.com/uc.js204ms190ms9ms3rd
https://www.chalmers.se/_next/static/chunks/05m9y5ska0j~y.js195ms2ms189ms3rd
https://www.chalmers.se/_next/static/chunks/0yk-4-6jn7~rs.js121ms90ms14ms3rd
D
JS Bundles
Action
14 scripts, 469 KB unused
FIX
14 scripts, 469 KB unused
Warning::
https://www.chalmers.se/_next/static/chunks/05m9y5...: 330 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.chalmers.se/_next/static/chunks/03qhjt...: 65 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://consent.cookiebot.com/bc2bfc50-f07e-4937-9...: 26 KB unused (24%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.chalmers.se/_next/static/chunks/0yk-4-...: 25 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.chalmers.se/_next/static/chunks/0rxc34...: 24 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 469 KB
469 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.chalmers.se/_next/static/chunks/05m9y5ska0j~y.js515 KB330 KB (64%)✓3rd
https://www.chalmers.se/_next/static/chunks/03qhjty7_tkhq.js65 KB65 KB (100%)✓3rd
https://consent.cookiebot.com/bc2bfc50-f07e-4937-9777-a31824946168/cc.js?renew=false&referer=www.chalmers.se&dnt=false&init=false107 KB26 KB (24%)✓3rd
https://www.chalmers.se/_next/static/chunks/0yk-4-6jn7~rs.js48 KB25 KB (52%)✓3rd
https://www.chalmers.se/_next/static/chunks/0rxc34.8xt2wt.js69 KB24 KB (35%)✓3rd
https://www.chalmers.se/_next/static/chunks/17f8d~e8ew8u..js12 KB—✓3rd
https://consent.cookiebot.com/uc.js27 KB—✓3rd
https://www.chalmers.se/_next/static/chunks/0fqgw7wcy6c6m.js4 KB—✓3rd
https://www.chalmers.se/_next/static/chunks/0xp~wg5m99o8h.js2 KB—✓3rd
https://www.chalmers.se/_next/static/chunks/05p~do9r8rw_e.js25 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

F
Page Weight Inventory
Action
72 resources · 1.4 MB · 469 KB savings available
FIX
72 resources · 1.4 MB · 469 KB savings available
Warning::
Page weight 454 KB over 1MB target
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~469 KB of savings available
Warning::
71 third-party resources (100% of weight)
Info::
1 resources over 200KB
72 resources · 1.4 MiB · 71 third-party 454.4 KiB over 1MB target
JavaScript 61% · 896.1 KiB
Image 25% · 374.1 KiB
Document 7% · 98.0 KiB
Font 3% · 47.6 KiB
Other 3% · 37.2 KiB
CSS 2% · 25.4 KiB

~469.4 KiB of savings available

Remove unused JavaScript: 469.4 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.

B
Page Weight Budget
1.4 MB transferred, 72 requests
REVIEW
1.4 MB transferred, 72 requests
Info::
Page weighs 4.3 MB (1.4 MB transferred)
Warning::
JavaScript is 896 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 896 KB
Info::
72 HTTP requests
Info::
Estimated 0.30 g CO2 per page load
1.4 MB / 2.4 MB budget
1.4 MB transferred
72 requests
0.30 g CO2 per page load
JavaScript 896.1 KiB 61%
Images 371.9 KiB 25%
HTML 97.9 KiB 7%
Fonts 47.6 KiB 3%
Other 35.6 KiB 2%
CSS 25.4 KiB 2%
Other 2.3 KiB 0%
Other 941 B 0%
Other 675 B 0%
0 2.4 MB 4.9 MB
Under budget

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

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+
Image Optimization
11 images, 0 KB saveable
PASS
11 images, 0 KB saveable
Info::
All images are well-optimized
11 images 372 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
1 fonts (48 KB)
PASS
1 fonts (48 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

48 KB total

Render-blocking

0

of 1

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 FCP 4.1 s LCP 9.7 shttps://www.chalmers.se/_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff283afe278b6a6bb3c-s.p.0q... https://www.chalmers.se/_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff2 — 47.6 KiB — 130 ms — font-display: swap
83afe278b6a6bb3c-s.p.0q... woff2 swap
Size 48 KB
Load time 130 ms
Start 279 ms
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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
—
preload
4
dns-prefetch
—
prefetch
—

4 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
72 requests over 2009ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 4.1 s LCP 9.7 shttps://chalmers.se// https://chalmers.se/ — 301 — 102 B — 146 ms — h2https://www.chalmers.se/www.chalmers.se/ https://www.chalmers.se/ — 200 — 97.1 KiB — 260 ms — h2https://www.chalmers.se/_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff2www.chalmers.se/_next/static/media/... https://www.chalmers.se/_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff2 — 200 — 47.6 KiB — 130 ms — h2https://www.chalmers.se/_next/static/chunks/0fvjj.brwdivk.csswww.chalmers.se/_next/static/chunks... https://www.chalmers.se/_next/static/chunks/0fvjj.brwdivk.css — 200 — 14.8 KiB — 133 ms — h2https://mfstatic.com/css/mediaflowplayer.min.cssmfstatic.com/css/mediaflowplayer.mi... https://mfstatic.com/css/mediaflowplayer.min.css — 200 — 10.7 KiB — 257 ms — h2https://consent.cookiebot.com/uc.jsconsent.cookiebot.com/uc.js https://consent.cookiebot.com/uc.js — 200 — 27.0 KiB — 58 ms — h2https://www.chalmers.se/_next/image/?url=https%3A%2F%2Fcms.www.chalmers.se%2FMedia%2Fyvdchn4k%2Fmockups_visuellid_1920x1080.jpg%3Fwidth%3D1920%26height%3D1080%26v%3D1dcd16f96781760%26quality%3D60%26format%3Dwebp&w=750&q=90www.chalmers.se/_next/image/?url=ht... https://www.chalmers.se/_next/image/?url=https%3A%2F%2Fcms.www.chalmers.se%2FMedia%2Fyvdchn4k%2Fmockups_visuellid_1920x1080.jpg%3Fwidth%3D1920%26height%3D1080%26v%3D1dcd16f96781760%26quality%3D60%26format%3Dwebp&w=750&q=90 — 200 — 58.4 KiB — 167 ms — h2https://www.chalmers.se/_next/static/chunks/0s8numf2lkzjr.jswww.chalmers.se/_next/static/chunks... https://www.chalmers.se/_next/static/chunks/0s8numf2lkzjr.js — 200 — 8.1 KiB — 125 ms — h2https://www.chalmers.se/_next/static/chunks/0yk-4-6jn7~rs.jswww.chalmers.se/_next/static/chunks... https://www.chalmers.se/_next/static/chunks/0yk-4-6jn7~rs.js — 200 — 48.3 KiB — 171 ms — h2https://www.chalmers.se/_next/static/chunks/0rxc34.8xt2wt.jswww.chalmers.se/_next/static/chunks... https://www.chalmers.se/_next/static/chunks/0rxc34.8xt2wt.js — 200 — 69.2 KiB — 170 ms — h2https://www.chalmers.se/manifest.jsonwww.chalmers.se/manifest.json https://www.chalmers.se/manifest.json — 200 — 675 B — 148 ms — h2https://www.chalmers.se/_next/static/chunks/turbopack-01nqb3~4xo5-_.jswww.chalmers.se/_next/static/chunks... https://www.chalmers.se/_next/static/chunks/turbopack-01nqb3~4xo5-_.js — 200 — 4.3 KiB — 49 ms — h2https://www.chalmers.se/_next/static/chunks/0xp~wg5m99o8h.jswww.chalmers.se/_next/static/chunks... https://www.chalmers.se/_next/static/chunks/0xp~wg5m99o8h.js — 200 — 2.5 KiB — 48 ms — h2https://www.chalmers.se/_next/static/chunks/17f8d~e8ew8u..jswww.chalmers.se/_next/static/chunks... https://www.chalmers.se/_next/static/chunks/17f8d~e8ew8u..js — 200 — 12.3 KiB — 48 ms — h2https://www.chalmers.se/_next/static/chunks/0fqgw7wcy6c6m.jswww.chalmers.se/_next/static/chunks... https://www.chalmers.se/_next/static/chunks/0fqgw7wcy6c6m.js — 200 — 4.2 KiB — 50 ms — h2https://www.chalmers.se/_next/static/chunks/05m9y5ska0j~y.jswww.chalmers.se/_next/static/chunks... https://www.chalmers.se/_next/static/chunks/05m9y5ska0j~y.js — 200 — 514.6 KiB — 105 ms — h2https://www.chalmers.se/_next/static/chunks/05p~do9r8rw_e.jswww.chalmers.se/_next/static/chunks... https://www.chalmers.se/_next/static/chunks/05p~do9r8rw_e.js — 200 — 25.2 KiB — 99 ms — h2https://www.chalmers.se/_next/static/chunks/0y.6a34k0mtid.jswww.chalmers.se/_next/static/chunks... https://www.chalmers.se/_next/static/chunks/0y.6a34k0mtid.js — 200 — 7.2 KiB — 95 ms — h2https://www.chalmers.se/_next/static/chunks/03qhjty7_tkhq.jswww.chalmers.se/_next/static/chunks... https://www.chalmers.se/_next/static/chunks/03qhjty7_tkhq.js — 200 — 65.2 KiB — 61 ms — h2https://www.chalmers.se/_next/static/chunks/0l_aije2_02mr.jswww.chalmers.se/_next/static/chunks... https://www.chalmers.se/_next/static/chunks/0l_aije2_02mr.js — 200 — 1.1 KiB — 54 ms — h2https://consentcdn.cookiebot.com/consentconfig/bc2bfc50-f07e-4937-9777-a31824946168/settings.jsonconsentcdn.cookiebot.com/consentcon... https://consentcdn.cookiebot.com/consentconfig/bc2bfc50-f07e-4937-9777-a31824946168/settings.json — 200 — 941 B — 50 ms — h2https://consent.cookiebot.com/bc2bfc50-f07e-4937-9777-a31824946168/cc.js?renew=false&referer=www.chalmers.se&dnt=false&init=falseconsent.cookiebot.com/bc2bfc50-f07e... https://consent.cookiebot.com/bc2bfc50-f07e-4937-9777-a31824946168/cc.js?renew=false&referer=www.chalmers.se&dnt=false&init=false — 200 — 106.8 KiB — 79 ms — h2https://consentcdn.cookiebot.com/sdk/bc-v4.min.htmlconsentcdn.cookiebot.com/sdk/bc-v4.... https://consentcdn.cookiebot.com/sdk/bc-v4.min.html — 200 — 808 B — 46 ms — h2data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cfilter id='b' colo…www.w3.org/2000/svg' %3E%3Cfilter i... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cfilter id='b' colo… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cfilter id='b' colo…www.w3.org/2000/svg' %3E%3Cfilter i... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cfilter id='b' colo… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cfilter id='b' colo…www.w3.org/2000/svg' %3E%3Cfilter i... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cfilter id='b' colo… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cfilter id='b' colo…www.w3.org/2000/svg' %3E%3Cfilter i... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cfilter id='b' colo… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cfilter id='b' colo…www.w3.org/2000/svg' %3E%3Cfilter i... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cfilter id='b' colo… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cfilter id='b' colo…www.w3.org/2000/svg' %3E%3Cfilter i... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cfilter id='b' colo… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cfilter id='b' colo…www.w3.org/2000/svg' %3E%3Cfilter i... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cfilter id='b' colo… — 200 — 0 B — 0 ms — data
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 4.1 s LCP 9.7 shttps://chalmers.se// https://chalmers.se/ — 301 — 102 B — 146 ms — h2https://www.chalmers.se/www.chalmers.se/ https://www.chalmers.se/ — 200 — 97.1 KiB — 260 ms — h2https://www.chalmers.se/_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff2www.chalmers.se/_next/static/media/... https://www.chalmers.se/_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff2 — 200 — 47.6 KiB — 130 ms — h2https://www.chalmers.se/_next/static/chunks/0fvjj.brwdivk.csswww.chalmers.se/_next/static/chunks... https://www.chalmers.se/_next/static/chunks/0fvjj.brwdivk.css — 200 — 14.8 KiB — 133 ms — h2https://mfstatic.com/css/mediaflowplayer.min.cssmfstatic.com/css/mediaflowplayer.mi... https://mfstatic.com/css/mediaflowplayer.min.css — 200 — 10.7 KiB — 257 ms — h2https://consent.cookiebot.com/uc.jsconsent.cookiebot.com/uc.js https://consent.cookiebot.com/uc.js — 200 — 27.0 KiB — 58 ms — h2https://www.chalmers.se/_next/image/?url=https%3A%2F%2Fcms.www.chalmers.se%2FMedia%2Fyvdchn4k%2Fmockups_visuellid_1920x1080.jpg%3Fwidth%3D1920%26height%3D1080%26v%3D1dcd16f96781760%26quality%3D60%26format%3Dwebp&w=750&q=90www.chalmers.se/_next/image/?url=ht... https://www.chalmers.se/_next/image/?url=https%3A%2F%2Fcms.www.chalmers.se%2FMedia%2Fyvdchn4k%2Fmockups_visuellid_1920x1080.jpg%3Fwidth%3D1920%26height%3D1080%26v%3D1dcd16f96781760%26quality%3D60%26format%3Dwebp&w=750&q=90 — 200 — 58.4 KiB — 167 ms — h2https://www.chalmers.se/_next/static/chunks/0s8numf2lkzjr.jswww.chalmers.se/_next/static/chunks... https://www.chalmers.se/_next/static/chunks/0s8numf2lkzjr.js — 200 — 8.1 KiB — 125 ms — h2https://www.chalmers.se/_next/static/chunks/0yk-4-6jn7~rs.jswww.chalmers.se/_next/static/chunks... https://www.chalmers.se/_next/static/chunks/0yk-4-6jn7~rs.js — 200 — 48.3 KiB — 171 ms — h2https://www.chalmers.se/_next/static/chunks/0rxc34.8xt2wt.jswww.chalmers.se/_next/static/chunks... 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h2https://www.chalmers.se/utbildning/anmalan-och-behorighet/?_rsc=eqsj4www.chalmers.se/utbildning/anmalan-... https://www.chalmers.se/utbildning/anmalan-och-behorighet/?_rsc=eqsj4 — 200 — 942 B — 64 ms — h2https://www.chalmers.se/utbildning/program-och-kurser/?_rsc=eqsj4www.chalmers.se/utbildning/program-... https://www.chalmers.se/utbildning/program-och-kurser/?_rsc=eqsj4 — 200 — 920 B — 64 ms — h2https://www.chalmers.se/utbildning/hitta-program/?_rsc=eqsj4www.chalmers.se/utbildning/hitta-pr... https://www.chalmers.se/utbildning/hitta-program/?_rsc=eqsj4 — 200 — 891 B — 55 ms — h2https://www.chalmers.se/om-chalmers/arbeta-hos-oss/?_rsc=1a28hwww.chalmers.se/om-chalmers/arbeta-... https://www.chalmers.se/om-chalmers/arbeta-hos-oss/?_rsc=1a28h — 200 — 699 B — 196 ms — h2https://www.chalmers.se/infrastrukturer/?_rsc=1a28hwww.chalmers.se/infrastrukturer/?_r... https://www.chalmers.se/infrastrukturer/?_rsc=1a28h — 200 — 643 B — 184 ms — h2https://www.chalmers.se/forskning/vi-utbildar-nya-forskare/?_rsc=1a28hwww.chalmers.se/forskning/vi-utbild... https://www.chalmers.se/forskning/vi-utbildar-nya-forskare/?_rsc=1a28h — 200 — 739 B — 102 ms — h2https://www.chalmers.se/forskning/mot-vara-forskare/?_rsc=1a28hwww.chalmers.se/forskning/mot-vara-... https://www.chalmers.se/forskning/mot-vara-forskare/?_rsc=1a28h — 200 — 704 B — 90 ms — h2https://www.chalmers.se/forskning/forskningsomraden-i-urval/?_rsc=1a28hwww.chalmers.se/forskning/forskning... https://www.chalmers.se/forskning/forskningsomraden-i-urval/?_rsc=1a28h — 200 — 744 B — 95 ms — h2https://www.chalmers.se/utbildning/ny-student/?_rsc=1a28hwww.chalmers.se/utbildning/ny-stude... https://www.chalmers.se/utbildning/ny-student/?_rsc=1a28h — 200 — 673 B — 240 ms — h2https://www.chalmers.se/utbildning/anmalan-och-behorighet/?_rsc=1a28hwww.chalmers.se/utbildning/anmalan-... https://www.chalmers.se/utbildning/anmalan-och-behorighet/?_rsc=1a28h — 200 — 2.0 KiB — 78 ms — h2https://www.chalmers.se/utbildning/program-och-kurser/?_rsc=1a28hwww.chalmers.se/utbildning/program-... https://www.chalmers.se/utbildning/program-och-kurser/?_rsc=1a28h — 200 — 714 B — 108 ms — h2https://www.chalmers.se/utbildning/hitta-program/?_rsc=1a28hwww.chalmers.se/utbildning/hitta-pr... https://www.chalmers.se/utbildning/hitta-program/?_rsc=1a28h — 200 — 689 B — 67 ms — h2https://www.chalmers.se/?_rsc=1a28hwww.chalmers.se/?_rsc=1a28h https://www.chalmers.se/?_rsc=1a28h — 200 — 561 B — 134 ms — h2
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
First-party Third-party 2838ms · 863KB · kr516/mo
www.chalmers.se
Other
Costly
Execution 1280ms
Transfer 69 KB
Unused 35%
Monthly Cost kr233/mo
Unattributable
Other
Costly
Execution 431ms
Transfer 0 KB
Monthly Cost kr78/mo
www.chalmers.se
Other
Costly
Execution 378ms
Transfer 97 KB
Monthly Cost kr69/mo
consent.cookiebot.com
Other
Costly
Execution 227ms
Transfer 107 KB
Unused 24%
Monthly Cost kr41/mo
consent.cookiebot.com
Other
Costly
Execution 204ms
Transfer 27 KB
Monthly Cost kr37/mo
www.chalmers.se
Other
Optional
Execution 195ms
Transfer 515 KB
Unused 64%
Monthly Cost kr35/mo
www.chalmers.se
Other
Optional
Execution 121ms
Transfer 48 KB
Unused 52%
Monthly Cost kr22/mo

These scripts may cost more than they're worth

  • www.chalmers.se adds 1280ms and costs ~kr233/month
  • Unattributable adds 431ms and costs ~kr78/month
  • www.chalmers.se adds 378ms and costs ~kr69/month
  • consent.cookiebot.com adds 227ms and costs ~kr41/month
  • consent.cookiebot.com adds 204ms and costs ~kr37/month

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

www.chalmers.se takes 1280ms 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

Unattributable takes 431ms 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

www.chalmers.se takes 378ms 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

consent.cookiebot.com takes 227ms 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

consent.cookiebot.com takes 204ms 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

64% of www.chalmers.se'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

52% of www.chalmers.se'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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