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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
60
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.
100
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.

2.52 s

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

5.53 s

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

81 ms

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

0.016

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

3.04 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.

5.56 s

Page Load Progression

428 ms
856 ms
1.3 s
1.7 s
2.1 s
2.6 s
3.0 s
3.4 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
4.9 MB transferred, 50 requests
FIX
4.9 MB transferred, 50 requests
Critical::
Page weighs 6.8 MB (4.9 MB transferred)
Info::
Fonts are 2.6 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 2.6 MB
Warning::
Images are 1.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.6 MB
Warning::
JavaScript is 555 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 555 KB
Info::
50 HTTP requests
Info::
Estimated 1.0 g CO2 per page load
4.9 MB / 2.4 MB budget
4.9 MB transferred
50 requests
1.0 g CO2 per page load
Fonts 2.6 MiB 52%
Images 1.6 MiB 33%
JavaScript 554.6 KiB 11%
CSS 148.6 KiB 3%
HTML 20.4 KiB 0%
Other 1.9 KiB 0%
Other 1.0 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

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 (4.9 MiB of 4.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
50 resources · 4.9 MB · 225 KB savings available
FIX
50 resources · 4.9 MB · 225 KB savings available
Warning::
Page weight 3.9 MB over 1MB target
Got: 4.9 MB Expected: ≤ 1 MB
Info::
~225 KB of savings available
Warning::
49 third-party resources (100% of weight)
Info::
7 resources over 200KB
50 resources · 4.9 MiB · 49 third-party 3.9 MiB over 1MB target
Font 52% · 2.6 MiB
Image 33% · 1.6 MiB
JavaScript 11% · 555.6 KiB
CSS 3% · 148.6 KiB
Document 0% · 20.7 KiB
Other 0% · 992 B

~224.8 KiB of savings available

Remove unused JavaScript: 224.8 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
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Warning::
https://www.lu.se/sites/www.lu.se/files/styles/lu_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lu.se/sites/www.lu.se/files/Lunds_univ... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lu.se/sites/www.lu.se/files/styles/lu_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lu.se/sites/www.lu.se/files/styles/lu_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lu.se/sites/www.lu.se/files/styles/lu_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lu.se/sites/www.lu.se/files/styles/lu_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lu.se/sites/www.lu.se/files/styles/lu_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lu.se/sites/www.lu.se/files/Lunds_univ... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lu.se/sites/www.lu.se/files/leru_0.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lu.se/sites/www.lu.se/files/styles/lu_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lu.se/sites/www.lu.se/files/styles/lu_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lu.se/sites/www.lu.se/files/styles/lu_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lu.se/sites/www.lu.se/files/u21_0.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.lu.se/sites/www.lu.se/files/styles/lu_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
19 images 1.6 MB
0 oversized -0 KB
4 legacy format
14 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

B
JS Execution Cost
767ms total JS execution
REVIEW
767ms total JS execution
Warning::
https://www.lu.se/: 295ms CPU time
Info::
Unattributable: 163ms CPU time
Info::
https://webstats.sgit.se/lu/matomo/matomo.js: 148ms CPU time
Info::
https://www.lu.se/sites/www.lu.se/files/js/js_Xmiq...: 102ms CPU time
Info::
https://www.browsealoud.com/modules/3.11.0/6514.ac...: 59ms CPU time
Warning::
Third-party scripts: 767ms (100% of total)

Main Thread Breakdown

Script Evaluation 35% Style & Layout 29% Other 22% Script Parsing & Compilation 6% Rendering 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.lu.se/295ms4ms0ms3rd
Unattributable163ms5ms0ms3rd
https://webstats.sgit.se/lu/matomo/matomo.js148ms143ms3ms3rd
https://www.lu.se/sites/www.lu.se/files/js/js_XmiqJKuiyACXkn6McDpuKnkst_1k14KJeCJCsF_GdQg.js?scope=header&delta=0&language=sv&theme=lu_theme&include=eJxtju0KwzAIRV-okEcKJrFdNvWGfFD29gvbj3RQUK6cgygPH4FX5hlaJJNFdnwDNxm-P1jZBYov3zGrXCDQW69UvCfh2m9NhAiVxrdSkUiWSRUl4bQLeRtpjl7ZhhdQ4rrkIQjX9WfzJ1XLdiw2h1BxNp4vYqQ_saPqAkrZvnc2pQ6F-8XWCulscwj7aJE6fwCe3X6W102ms44ms3ms3rd
https://www.browsealoud.com/modules/3.11.0/6514.ac3cda7a458b82b8b52f.js59ms47ms10ms3rd
C
JS Bundles
Action
17 scripts, 225 KB unused
REVIEW
17 scripts, 225 KB unused
Warning::
https://webstats.sgit.se/lu/matomo/matomo.js: 75 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.browsealoud.com/modules/3.11.0/4230.c2...: 70 KB unused (85%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.browsealoud.com/modules/3.11.0/6514.ac...: 40 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.lu.se/sites/www.lu.se/files/js/js_5e9T...: 39 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 225 KB
225 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://webstats.sgit.se/lu/matomo/matomo.js133 KB75 KB (57%)✓3rd
https://www.browsealoud.com/modules/3.11.0/4230.c222ded98d9c6a4219ab.js82 KB70 KB (85%)✓3rd
https://www.browsealoud.com/modules/3.11.0/6514.ac3cda7a458b82b8b52f.js104 KB40 KB (39%)✓3rd
https://www.lu.se/sites/www.lu.se/files/js/js_5e9TuwewO-yJ98xVtloTwewBKJvyXCqsz_VFDQ6ICt8.js?scope=footer&delta=0&language=sv&theme=lu_theme&include=eJxtju0KwzAIRV-okEcKJrFdNvWGfFD29gvbj3RQUK6cgygPH4FX5hlaJJNFdnwDNxm-P1jZBYov3zGrXCDQW69UvCfh2m9NhAiVxrdSkUiWSRUl4bQLeRtpjl7ZhhdQ4rrkIQjX9WfzJ1XLdiw2h1BxNp4vYqQ_saPqAkrZvnc2pQ6F-8XWCulscwj7aJE6fwCe3X6W54 KB39 KB (73%)✓3rd
https://www.browsealoud.com/modules/3.11.0/4916.dd13ed0cd26117b33f9d.js30 KB—✓3rd
https://plus.browsealoud.com/js/urlinfo/www.lu.se.js1 KB—✓3rd
https://www.browsealoud.com/modules/3.11.0/browsealoud.js41 KB—✓3rd
https://plus.browsealoud.com/js/urlinfo/www.lu.se.js0 KB—✓3rd
https://www.lu.se/sites/www.lu.se/files/js/js_XmiqJKuiyACXkn6McDpuKnkst_1k14KJeCJCsF_GdQg.js?scope=header&delta=0&language=sv&theme=lu_theme&include=eJxtju0KwzAIRV-okEcKJrFdNvWGfFD29gvbj3RQUK6cgygPH4FX5hlaJJNFdnwDNxm-P1jZBYov3zGrXCDQW69UvCfh2m9NhAiVxrdSkUiWSRUl4bQLeRtpjl7ZhhdQ4rrkIQjX9WfzJ1XLdiw2h1BxNp4vYqQ_saPqAkrZvnc2pQ6F-8XWCulscwj7aJE6fwCe3X6W38 KB—✓3rd
https://www.browsealoud.com/modules/3.11.0/2191.b9fbc2ad4e19a0ccda54.js10 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

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+
Font Loading
7 fonts (2617 KB)
PASS
7 fonts (2617 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

2617 KB total

Render-blocking

0

of 7

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 2.5 s LCP 5.5 shttps://www.lu.se/libraries/fontawesome/webfonts/fa-regular-400.woff2fa-regular-400.woff2 https://www.lu.se/libraries/fontawesome/webfonts/fa-regular-400.woff2 — 386.6 KiB — 1.3 s — font-display: swaphttps://www.lu.se/libraries/fontawesome/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.lu.se/libraries/fontawesome/webfonts/fa-solid-900.woff2 — 320.6 KiB — 1.2 s — font-display: swaphttps://www.lu.se/libraries/fontawesome/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.lu.se/libraries/fontawesome/webfonts/fa-brands-400.woff2 — 108.8 KiB — 997 ms — font-display: swaphttps://www.lu.se/libraries/fontawesome/webfonts/fa-light-300.woff2fa-light-300.woff2 https://www.lu.se/libraries/fontawesome/webfonts/fa-light-300.woff2 — 419.8 KiB — 1.5 s — font-display: swaphttps://www.lu.se/libraries/fontawesome/webfonts/fa-sharp-regular-400.woff2fa-sharp-regular-400.woff2 https://www.lu.se/libraries/fontawesome/webfonts/fa-sharp-regular-400.woff2 — 320.7 KiB — 1.2 s — font-display: swaphttps://www.lu.se/themes/custom/lu_theme/fonts/Inter-VariableFont_opsz,wght.woff2Inter-VariableFont_opsz... https://www.lu.se/themes/custom/lu_theme/fonts/Inter-VariableFont_opsz,wght.woff2 — 854.6 KiB — 1.3 s — font-display: swaphttps://www.lu.se/themes/custom/lu_theme/fonts/Lora-VariableFont_wght.woff2Lora-VariableFont_wght.... https://www.lu.se/themes/custom/lu_theme/fonts/Lora-VariableFont_wght.woff2 — 206.4 KiB — 616 ms — font-display: swap
fa-regular-400.woff2 woff2 swap
Size 387 KB
Load time 1.3 s
Start 1.2 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
fa-solid-900.woff2 woff2 swap
Size 321 KB
Load time 1.2 s
Start 1.2 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
fa-brands-400.woff2 woff2 swap
Size 109 KB
Load time 997 ms
Start 1.2 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
fa-light-300.woff2 woff2 swap
Size 420 KB
Load time 1.5 s
Start 1.2 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
fa-sharp-regular-400.woff2 woff2 swap
Size 321 KB
Load time 1.2 s
Start 1.2 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
Inter-VariableFont_opsz... woff2 swap
Size 855 KB
Load time 1.3 s
Start 2.1 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
Lora-VariableFont_wght.... woff2 swap
Size 206 KB
Load time 616 ms
Start 2.1 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
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 ~1309 KB and ~2618 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
50 requests over 3736ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.5 s LCP 5.5 shttps://lu.se// https://lu.se/ — 301 — 293 B — 664 ms — http/1.1https://www.lu.se/www.lu.se/ https://www.lu.se/ — 200 — 20.4 KiB — 515 ms — http/1.1https://www.lu.se/sites/www.lu.se/files/css/css_7WNU9q669fKX4vcClKUzoQP9iPUZZblmu1hsL4jYhNY.css?delta=0&language=sv&theme=lu_theme&include=eJyFkwFuwyAMRS-UNkdCBtyE1WBkm3Xd6UfbaaWo0qRI8X82tvxDAoHqdfWguIRHnFEVNtQlsOAapVWgI3zA1wMUlgyUvnHBYsmuDrPHuAaolrgs2FxgPifsr1wpQQm4voPOg-By4mJwQeWM6xAfL-hvUv8tOOqe8kLN2Y69xG3EHugJPISzM-5PHSDH66jY1ASqc0Ao9jaTSm122IRbfZvPHF_GCl8Uxf2aOSSaWbfpTweQePDE4fxkUbhGvgxVpz4IZda9e2kjlOyQeljMEXikKacIEvYBNqKpx44Qx0EP7aqkDDJ4lsK4RE9uOG9xh56_BlJOPIFu6lNSKsP5Hjxc7F-FW3xJ3NZ5AQQlprK5-mJ2hlSmBTPGBKMs_XBzglq5aPrEqb42T0l3pwY2dBbVp1AMt7vv3Oye7iwWmk09jZn67V_0qob5_vP9AFI7YtUwww.lu.se/sites/www.lu.se/files/css... https://www.lu.se/sites/www.lu.se/files/css/css_7WNU9q669fKX4vcClKUzoQP9iPUZZblmu1hsL4jYhNY.css?delta=0&language=sv&theme=lu_theme&include=eJyFkwFuwyAMRS-UNkdCBtyE1WBkm3Xd6UfbaaWo0qRI8X82tvxDAoHqdfWguIRHnFEVNtQlsOAapVWgI3zA1wMUlgyUvnHBYsmuDrPHuAaolrgs2FxgPifsr1wpQQm4voPOg-By4mJwQeWM6xAfL-hvUv8tOOqe8kLN2Y69xG3EHugJPISzM-5PHSDH66jY1ASqc0Ao9jaTSm122IRbfZvPHF_GCl8Uxf2aOSSaWbfpTweQePDE4fxkUbhGvgxVpz4IZda9e2kjlOyQeljMEXikKacIEvYBNqKpx44Qx0EP7aqkDDJ4lsK4RE9uOG9xh56_BlJOPIFu6lNSKsP5Hjxc7F-FW3xJ3NZ5AQQlprK5-mJ2hlSmBTPGBKMs_XBzglq5aPrEqb42T0l3pwY2dBbVp1AMt7vv3Oye7iwWmk09jZn67V_0qob5_vP9AFI7YtU — 200 — 100.4 KiB — 667 ms — 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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 767ms · 295KB · kr83/mo
www.lu.se
Other
Costly
Execution 295ms
Transfer 20 KB
Monthly Cost kr32/mo
Unattributable
Other
Optional
Execution 163ms
Transfer 0 KB
Monthly Cost kr18/mo
webstats.sgit.se
Other
Optional
Execution 148ms
Transfer 133 KB
Unused 57%
Monthly Cost kr16/mo
www.lu.se
Other
Optional
Execution 102ms
Transfer 38 KB
Monthly Cost kr11/mo
www.browsealoud.com
Other
Optional
Execution 59ms
Transfer 104 KB
Unused 39%
Monthly Cost kr6/mo

These scripts may cost more than they're worth

  • www.lu.se adds 295ms and costs ~kr32/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.lu.se takes 295ms 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

57% of webstats.sgit.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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