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https://kth.se

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
1
REVIEW
5
PASS
7
INFO
2

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

Mobile Desktop
90
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.

1.24 s

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

1.40 s

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

0 ms

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

0.002

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

1.77 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.

1.41 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
7 PASS 5 REVIEW 1 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 (1.2 MiB of 1.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
B
Page Weight Budget
1.2 MB transferred, 34 requests
REVIEW
1.2 MB transferred, 34 requests
Info::
Page weighs 2.0 MB (1.2 MB transferred)
Info::
34 HTTP requests
Info::
Estimated 0.25 g CO2 per page load
1.2 MB / 2.4 MB budget
1.2 MB transferred
34 requests
0.25 g CO2 per page load
Images 656.9 KiB 54%
JavaScript 410.8 KiB 34%
CSS 83.3 KiB 7%
Fonts 54.8 KiB 4%
HTML 17.3 KiB 1%
Other 2.0 KiB 0%
Other 266 B 0%
Other 138 B 0%
0 2.4 MB 4.9 MB
Under budget
B
JS Bundles
5 scripts, 112 KB unused
REVIEW
5 scripts, 112 KB unused
Warning::
https://analytics-stat.sys.kth.se/kth/matomo/js/co...: 60 KB unused (19%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.kth.se/js/core-82a01db45b4ca0cb6c8e8d2...: 53 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 112 KB
112 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://analytics-stat.sys.kth.se/kth/matomo/js/container_vsVPCyVy.js307 KB60 KB (19%)✓3rd
https://www.kth.se/js/core-82a01db45b4ca0cb6c8e8d2d67aa3f6e.js100 KB53 KB (53%)✓3rd
https://app.kth.se/kpm/kpm.js2 KB—✓3rd
https://www.kth.se/js/block/mega-menu-style10-044b68d8039254ab9d94bd0ea99e7c94.js1 KB—✓3rd
https://www.kth.se/js/block/search-block-cc59975a43b71990cde4d6c84635022d.js1 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

C
Page Weight Inventory
Action
34 resources · 1.2 MB · 112 KB savings available
REVIEW
34 resources · 1.2 MB · 112 KB savings available
Warning::
Page weight 202 KB over 1MB target
Got: 1.2 MB Expected: ≤ 1 MB
Info::
~112 KB of savings available
Warning::
33 third-party resources (100% of weight)
Info::
1 resources over 200KB
34 resources · 1.2 MiB · 33 third-party 201.5 KiB over 1MB target
Image 54% · 658.9 KiB
JavaScript 34% · 410.8 KiB
CSS 7% · 83.3 KiB
Font 4% · 54.8 KiB
Document 1% · 17.3 KiB
Other 0% · 475 B

~112.5 KiB of savings available

Remove unused JavaScript: 112.5 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
no-cache
REVIEW
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache

DirectiveValueMeaning
no-cache—Cache but always revalidate first
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
18 images, 0 KB saveable
PASS
18 images, 0 KB saveable
Info::
All images are well-optimized
18 images 657 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
185ms total JS execution
PASS
185ms total JS execution
Info::
https://www.kth.se/: 121ms CPU time
Info::
Unattributable: 64ms CPU time
Warning::
Third-party scripts: 185ms (100% of total)

Main Thread Breakdown

Other 28% Script Evaluation 26% Style & Layout 24% Rendering 9% Script Parsing & Compilation 8% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.kth.se/121ms6ms2ms3rd
Unattributable64ms4ms0ms3rd
A+
Font Loading
2 fonts (55 KB)
PASS
2 fonts (55 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

55 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.2 s LCP 1.4 shttps://www.kth.se/fonts/figtree-44a9ee14aa2122fcaa1f5b47fab14de9.woff2figtree-44a9ee14aa2122f... https://www.kth.se/fonts/figtree-44a9ee14aa2122fcaa1f5b47fab14de9.woff2 — 27.1 KiB — 186 ms — font-display: swaphttps://www.kth.se/fonts/figtree-italic-15ec50cff3ddac7541fa0e0754cf82af.woff2figtree-italic-15ec50cf... https://www.kth.se/fonts/figtree-italic-15ec50cff3ddac7541fa0e0754cf82af.woff2 — 27.7 KiB — 182 ms — font-display: swap
figtree-44a9ee14aa2122f... woff2 swap
Size 27 KB
Load time 186 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
figtree-italic-15ec50cf... woff2 swap
Size 28 KB
Load time 182 ms
Start 1.9 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
34 requests over 4785ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.2 s LCP 1.4 shttps://kth.se// https://kth.se/ — 301 — 71 B — 893 ms — h2https://www.kth.se/www.kth.se/ https://www.kth.se/ — 200 — 17.3 KiB — 193 ms — h2https://www.kth.se/css/kth-f6919e425a1c60964fdc47d8362288d0.csswww.kth.se/css/kth-f6919e425a1c6096... https://www.kth.se/css/kth-f6919e425a1c60964fdc47d8362288d0.css — 200 — 74.7 KiB — 712 ms — h2https://www.kth.se/img/logotype-white-6f02f4554cba157ca832fa452bf242a4.svgwww.kth.se/img/logotype-white-6f02f... https://www.kth.se/img/logotype-white-6f02f4554cba157ca832fa452bf242a4.svg — 200 — 25.3 KiB — 711 ms — h2https://www.kth.se/polopoly_fs/1.1393349.1742915954!/image/Industriel%20bioteknologi%2003_1252_550.webpwww.kth.se/polopoly_fs/1.1393349.17... https://www.kth.se/polopoly_fs/1.1393349.1742915954!/image/Industriel%20bioteknologi%2003_1252_550.webp — 200 — 50.8 KiB — 535 ms — h2https://www.kth.se/polopoly_fs/1.1470016.1776345911!/image/studenter.webpwww.kth.se/polopoly_fs/1.1470016.17... https://www.kth.se/polopoly_fs/1.1470016.1776345911!/image/studenter.webp — 200 — 83.3 KiB — 710 ms — h2https://www.kth.se/js/core-82a01db45b4ca0cb6c8e8d2d67aa3f6e.jswww.kth.se/js/core-82a01db45b4ca0cb... https://www.kth.se/js/core-82a01db45b4ca0cb6c8e8d2d67aa3f6e.js — 200 — 100.1 KiB — 360 ms — h2https://app.kth.se/kpm/kpm.jsapp.kth.se/kpm/kpm.js https://app.kth.se/kpm/kpm.js — 200 — 1.6 KiB — 861 ms — h2https://analytics-stat.sys.kth.se/kth/matomo/js/container_vsVPCyVy.jsanalytics-stat.sys.kth.se/kth/matom... https://analytics-stat.sys.kth.se/kth/matomo/js/container_vsVPCyVy.js — 200 — 307.4 KiB — 2.5 s — http/1.1https://www.kth.se/js/block/mega-menu-style10-044b68d8039254ab9d94bd0ea99e7c94.jswww.kth.se/js/block/mega-menu-style... https://www.kth.se/js/block/mega-menu-style10-044b68d8039254ab9d94bd0ea99e7c94.js — 200 — 1.1 KiB — 179 ms — h2https://www.kth.se/js/block/search-block-cc59975a43b71990cde4d6c84635022d.jswww.kth.se/js/block/search-block-cc... https://www.kth.se/js/block/search-block-cc59975a43b71990cde4d6c84635022d.js — 200 — 611 B — 182 ms — h2data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2220%22%2…data:image/svg+xml,%3Csvg%20xmlns%3... data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2220%22%2… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2220%22%2…data:image/svg+xml,%3Csvg%20xmlns%3... data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2220%22%2… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2220%22%2…data:image/svg+xml,%3Csvg%20xmlns%3... data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%2220%22%2… — 200 — 0 B — 0 ms — datadata:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4KPHN2ZyBpZD0iYSIKICAgI…data:image/svg+xml;base64,PD94bWwgd... data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4KPHN2ZyBpZD0iYSIKICAgI… — 200 — 0 B — 0 ms — datahttps://www.kth.se/polopoly_fs/1.1468593.1775806592!/image/legtest5.webpwww.kth.se/polopoly_fs/1.1468593.17... https://www.kth.se/polopoly_fs/1.1468593.1775806592!/image/legtest5.webp — 200 — 42.2 KiB — 181 ms — h2https://www.kth.se/polopoly_fs/1.1468905.1776080982!/image/Tomas_260408_920px.webpwww.kth.se/polopoly_fs/1.1468905.17... https://www.kth.se/polopoly_fs/1.1468905.1776080982!/image/Tomas_260408_920px.webp — 200 — 51.8 KiB — 185 ms — h2https://www.kth.se/polopoly_fs/1.1464756.1773991821!/image/_DSC7640_920_518.webpwww.kth.se/polopoly_fs/1.1464756.17... https://www.kth.se/polopoly_fs/1.1464756.1773991821!/image/_DSC7640_920_518.webp — 200 — 141.1 KiB — 300 ms — h2https://www.kth.se/fonts/figtree-44a9ee14aa2122fcaa1f5b47fab14de9.woff2www.kth.se/fonts/figtree-44a9ee14aa... https://www.kth.se/fonts/figtree-44a9ee14aa2122fcaa1f5b47fab14de9.woff2 — 200 — 27.1 KiB — 186 ms — h2https://www.kth.se/fonts/figtree-italic-15ec50cff3ddac7541fa0e0754cf82af.woff2www.kth.se/fonts/figtree-italic-15e... https://www.kth.se/fonts/figtree-italic-15ec50cff3ddac7541fa0e0754cf82af.woff2 — 200 — 27.7 KiB — 182 ms — h2https://www.kth.se/polopoly_fs/1.1390545.1742806573!/image/240516_4_3663_Print%20%283%29.webpwww.kth.se/polopoly_fs/1.1390545.17... https://www.kth.se/polopoly_fs/1.1390545.1742806573!/image/240516_4_3663_Print%20%283%29.webp — 200 — 45.6 KiB — 181 ms — h2https://www.kth.se/polopoly_fs/1.1330528.1744104891!/image/iStock-862661268%20%281%29_500_300.webpwww.kth.se/polopoly_fs/1.1330528.17... https://www.kth.se/polopoly_fs/1.1330528.1744104891!/image/iStock-862661268%20%281%29_500_300.webp — 200 — 20.1 KiB — 180 ms — h2https://www.kth.se/polopoly_fs/1.1341764.1744106023!/image/220606_1023_J_OTW_KTH_0507_500_300.webpwww.kth.se/polopoly_fs/1.1341764.17... https://www.kth.se/polopoly_fs/1.1341764.1744106023!/image/220606_1023_J_OTW_KTH_0507_500_300.webp — 200 — 36.1 KiB — 181 ms — h2https://www.kth.se/polopoly_fs/1.1398709.1771494618!/image/KTH%20Sommarkurser%20Frist%C3%A5ende%20kurser%20f%C3%B6r%20yrkesverksamma%20p.webpwww.kth.se/polopoly_fs/1.1398709.17... https://www.kth.se/polopoly_fs/1.1398709.1771494618!/image/KTH%20Sommarkurser%20Frist%C3%A5ende%20kurser%20f%C3%B6r%20yrkesverksamma%20p.webp — 200 — 24.1 KiB — 183 ms — h2https://www.kth.se/polopoly_fs/1.1369742.1773305772!/image/KTHAK_blurrad%20publik%20609%20px_300.webpwww.kth.se/polopoly_fs/1.1369742.17... https://www.kth.se/polopoly_fs/1.1369742.1773305772!/image/KTHAK_blurrad%20publik%20609%20px_300.webp — 200 — 45.3 KiB — 181 ms — h2https://www.kth.se/polopoly_fs/1.1047015.1731584499!/image/Anders-So%CC%88derholm-01_Z9M3670-copy_fotograf-Mikael-Sjo%CC%88berg_300dpi_5000x3333px_500_300.webpwww.kth.se/polopoly_fs/1.1047015.17... https://www.kth.se/polopoly_fs/1.1047015.1731584499!/image/Anders-So%CC%88derholm-01_Z9M3670-copy_fotograf-Mikael-Sjo%CC%88berg_300dpi_5000x3333px_500_300.webp — 200 — 9.0 KiB — 178 ms — h2https://www.kth.se/api/liveedit/enablewww.kth.se/api/liveedit/enable https://www.kth.se/api/liveedit/enable — 200 — 138 B — 183 ms — h2https://www.kth.se/polopoly_fs/1.1369002.1773991590!/image/dotoppvar_500_300.webpwww.kth.se/polopoly_fs/1.1369002.17... https://www.kth.se/polopoly_fs/1.1369002.1773991590!/image/dotoppvar_500_300.webp — 200 — 29.9 KiB — 179 ms — h2https://www.kth.se/polopoly_fs/1.1247689.1731584593!/image/alumnevenemang_IMG_0010_500_300.webpwww.kth.se/polopoly_fs/1.1247689.17... https://www.kth.se/polopoly_fs/1.1247689.1731584593!/image/alumnevenemang_IMG_0010_500_300.webp — 200 — 30.7 KiB — 180 ms — h2https://www.kth.se/polopoly_fs/1.1279986.1731584626!/image/medarbetare_Z9M9742_500_300.webpwww.kth.se/polopoly_fs/1.1279986.17... https://www.kth.se/polopoly_fs/1.1279986.1731584626!/image/medarbetare_Z9M9742_500_300.webp — 200 — 12.4 KiB — 181 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.2 s LCP 1.4 shttps://kth.se// https://kth.se/ — 301 — 71 B — 893 ms — h2https://www.kth.se/www.kth.se/ https://www.kth.se/ — 200 — 17.3 KiB — 193 ms — h2https://www.kth.se/css/kth-f6919e425a1c60964fdc47d8362288d0.csswww.kth.se/css/kth-f6919e425a1c6096... https://www.kth.se/css/kth-f6919e425a1c60964fdc47d8362288d0.css — 200 — 74.7 KiB — 712 ms — h2https://www.kth.se/img/logotype-white-6f02f4554cba157ca832fa452bf242a4.svgwww.kth.se/img/logotype-white-6f02f... https://www.kth.se/img/logotype-white-6f02f4554cba157ca832fa452bf242a4.svg — 200 — 25.3 KiB — 711 ms — h2https://www.kth.se/polopoly_fs/1.1393349.1742915954!/image/Industriel%20bioteknologi%2003_1252_550.webpwww.kth.se/polopoly_fs/1.1393349.17... https://www.kth.se/polopoly_fs/1.1393349.1742915954!/image/Industriel%20bioteknologi%2003_1252_550.webp — 200 — 50.8 KiB — 535 ms — h2https://www.kth.se/polopoly_fs/1.1470016.1776345911!/image/studenter.webpwww.kth.se/polopoly_fs/1.1470016.17... https://www.kth.se/polopoly_fs/1.1470016.1776345911!/image/studenter.webp — 200 — 83.3 KiB — 710 ms — h2https://www.kth.se/js/core-82a01db45b4ca0cb6c8e8d2d67aa3f6e.jswww.kth.se/js/core-82a01db45b4ca0cb... https://www.kth.se/js/core-82a01db45b4ca0cb6c8e8d2d67aa3f6e.js — 200 — 100.1 KiB — 360 ms — h2https://app.kth.se/kpm/kpm.jsapp.kth.se/kpm/kpm.js https://app.kth.se/kpm/kpm.js — 200 — 1.6 KiB — 861 ms — h2https://analytics-stat.sys.kth.se/kth/matomo/js/container_vsVPCyVy.jsanalytics-stat.sys.kth.se/kth/matom... https://analytics-stat.sys.kth.se/kth/matomo/js/container_vsVPCyVy.js — 200 — 307.4 KiB — 2.5 s — http/1.1https://www.kth.se/js/block/mega-menu-style10-044b68d8039254ab9d94bd0ea99e7c94.jswww.kth.se/js/block/mega-menu-style... https://www.kth.se/js/block/mega-menu-style10-044b68d8039254ab9d94bd0ea99e7c94.js — 200 — 1.1 KiB — 179 ms — h2https://www.kth.se/js/block/search-block-cc59975a43b71990cde4d6c84635022d.jswww.kth.se/js/block/search-block-cc... 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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
First-party Third-party 185ms · 17KB · kr20/mo
www.kth.se
Other
Optional
Execution 121ms
Transfer 17 KB
Monthly Cost kr13/mo
Unattributable
Other
Optional
Execution 64ms
Transfer 0 KB
Monthly Cost kr7/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

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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