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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
56
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.
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.

5.97 s

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

13.56 s

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

95 ms

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.

9.87 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.

14.02 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
7 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 56 requests
FIX
3.1 MB transferred, 56 requests
Warning::
Page weighs 4.7 MB (3.1 MB transferred)
Warning::
Images are 2.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.3 MB
Warning::
JavaScript is 549 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 549 KB
Info::
56 HTTP requests
Info::
Estimated 0.65 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
56 requests
0.65 g CO2 per page load
Images 2.3 MiB 75%
JavaScript 548.6 KiB 17%
Fonts 155.2 KiB 5%
HTML 44.5 KiB 1%
CSS 38.3 KiB 1%
Other 4.1 KiB 0%
Other 813 B 0%
Other 106 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

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 (3.1 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
56 resources · 3.1 MB · 296 KB savings available
FIX
56 resources · 3.1 MB · 296 KB savings available
Warning::
Page weight 2.1 MB over 1MB target
Got: 3.1 MB Expected: ≤ 1 MB
Info::
~296 KB of savings available
Warning::
55 third-party resources (100% of weight)
Info::
6 resources over 200KB
56 resources · 3.1 MiB · 55 third-party 2.1 MiB over 1MB target
Image 75% · 2.3 MiB
JavaScript 17% · 548.6 KiB
Font 5% · 155.2 KiB
Document 1% · 44.7 KiB
CSS 1% · 38.3 KiB
Other 0% · 813 B

~295.7 KiB of savings available

Remove unused JavaScript: 295.7 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.

B
Image Optimization
29 images, 0 KB saveable
REVIEW
29 images, 0 KB saveable
Info::
All images are well-optimized
29 images 2.3 MB
0 oversized -0 KB
29 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1755ms total JS execution
REVIEW
1755ms total JS execution
Warning::
https://www.gu.se/sites/default/files/js/js_WuoLTi...: 834ms CPU time
Warning::
Unattributable: 321ms CPU time
Info::
https://www.gu.se/: 178ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-KZ7...: 142ms CPU time
Info::
https://www.gu.se/sites/default/files/js/js_2O3j8p...: 117ms CPU time
Warning::
Third-party scripts: 1755ms (100% of total)

Main Thread Breakdown

Script Evaluation 33% Other 32% Style & Layout 18% Script Parsing & Compilation 9% Rendering 4% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.gu.se/sites/default/files/js/js_WuoLTi8hspulc5vOwt9fLLKA1wFQeSnNPA68u4iVXlc.js?scope=footer&delta=0&language=sv&theme=gu_ruby&include=eJxtil0OAiEMhC-02iORyjZ1tICBonJ7lxcTiS_z881ID7GUO-Sw9DBwjkLyB25aipoEZyU9ZO1nvvH7F6ZNe9hH5oQYkFiFVjAfqZvDkLWz0dLnXvtlEEfHU07Nx1wmbsI1XumbtgaXF3YJbFKdkOEf-iNXTQ834ms276ms79ms3rd
Unattributable321ms13ms0ms3rd
https://www.gu.se/178ms4ms1ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KZ7P6DN142ms99ms29ms3rd
https://www.gu.se/sites/default/files/js/js_2O3j8pOXIfHS8h7oVhQVaC8hfA0O5FO8ppWoYwi7hUM.js?scope=header&delta=1&language=sv&theme=gu_ruby&include=eJxtil0OAiEMhC-02iORyjZ1tICBonJ7lxcTiS_z881ID7GUO-Sw9DBwjkLyB25aipoEZyU9ZO1nvvH7F6ZNe9hH5oQYkFiFVjAfqZvDkLWz0dLnXvtlEEfHU07Nx1wmbsI1XumbtgaXF3YJbFKdkOEf-iNXTQ117ms66ms1ms3rd
https://script.e-space.se/gu-se.min.js102ms73ms25ms3rd
https://siteimproveanalytics.com/js/siteanalyze_7340.js62ms37ms21ms3rd
C
JS Bundles
Action
10 scripts, 296 KB unused
REVIEW
10 scripts, 296 KB unused
Warning::
https://www.gu.se/sites/default/files/js/js_WuoLTi...: 181 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KZ7...: 66 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.e-space.se/gu-se.min.js: 48 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 296 KB
296 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gu.se/sites/default/files/js/js_WuoLTi8hspulc5vOwt9fLLKA1wFQeSnNPA68u4iVXlc.js?scope=footer&delta=0&language=sv&theme=gu_ruby&include=eJxtil0OAiEMhC-02iORyjZ1tICBonJ7lxcTiS_z881ID7GUO-Sw9DBwjkLyB25aipoEZyU9ZO1nvvH7F6ZNe9hH5oQYkFiFVjAfqZvDkLWz0dLnXvtlEEfHU07Nx1wmbsI1XumbtgaXF3YJbFKdkOEf-iNXTQ279 KB181 KB (65%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KZ7P6DN119 KB66 KB (56%)✓3rd
https://script.e-space.se/gu-se.min.js89 KB48 KB (54%)✓3rd
https://www.gu.se/sites/default/files/eu_cookie_compliance/eu_cookie_compliance.script.js?01 KB—✓3rd
https://www.gu.se/core/assets/vendor/jquery/jquery.min.js?v=4.0.0-rc.128 KB—✓3rd
https://www.gu.se/sites/default/files/js/js_2O3j8pOXIfHS8h7oVhQVaC8hfA0O5FO8ppWoYwi7hUM.js?scope=header&delta=1&language=sv&theme=gu_ruby&include=eJxtil0OAiEMhC-02iORyjZ1tICBonJ7lxcTiS_z881ID7GUO-Sw9DBwjkLyB25aipoEZyU9ZO1nvvH7F6ZNe9hH5oQYkFiFVjAfqZvDkLWz0dLnXvtlEEfHU07Nx1wmbsI1XumbtgaXF3YJbFKdkOEf-iNXTQ7 KB—✓3rd
https://www.gu.se/modules/contrib/google_tag/js/gtag.js?tcpd9c1 KB—✓3rd
https://www.gu.se/modules/contrib/google_tag/js/gtm.js?tcpd9c1 KB—✓3rd
https://www.gu.se/sites/default/files/js/js_7v3GXr-s9t_I-ZUjcz0LsQeSA-PH9xEgF-yHjK-5-Rc.js?scope=header&delta=4&language=sv&theme=gu_ruby&include=eJxtil0OAiEMhC-02iORyjZ1tICBonJ7lxcTiS_z881ID7GUO-Sw9DBwjkLyB25aipoEZyU9ZO1nvvH7F6ZNe9hH5oQYkFiFVjAfqZvDkLWz0dLnXvtlEEfHU07Nx1wmbsI1XumbtgaXF3YJbFKdkOEf-iNXTQ1 KB—✓3rd
https://siteimproveanalytics.com/js/siteanalyze_7340.js23 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

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
6 fonts (155 KB)
PASS
6 fonts (155 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

155 KB total

Render-blocking

0

of 6

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 FCP 6.0 s LCP 13.6 shttps://use.typekit.net/af/829fc1/00000000000000003b9acaf8/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3l https://use.typekit.net/af/829fc1/00000000000000003b9acaf8/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3 — 26.2 KiB — 17 ms — font-display: swaphttps://use.typekit.net/af/6d4bb2/00000000000000003b9acafc/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/6d4bb2/00000000000000003b9acafc/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 26.0 KiB — 18 ms — font-display: swaphttps://use.typekit.net/af/a2c82e/00000000000000003b9acaf4/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3l https://use.typekit.net/af/a2c82e/00000000000000003b9acaf4/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3 — 26.1 KiB — 20 ms — font-display: swaphttps://use.typekit.net/af/9871e5/00000000000000003b9acaf2/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n2&v=3l https://use.typekit.net/af/9871e5/00000000000000003b9acaf2/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n2&v=3 — 26.1 KiB — 36 ms — font-display: swaphttps://use.typekit.net/af/ac1071/00000000000000003b9acafe/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n8&v=3l https://use.typekit.net/af/ac1071/00000000000000003b9acafe/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n8&v=3 — 26.3 KiB — 22 ms — font-display: swaphttps://use.typekit.net/af/c4767b/00000000000000003b9acb20/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/c4767b/00000000000000003b9acb20/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 24.4 KiB — 23 ms — font-display: swap
l woff2 swap
Size 26 KB
Load time 17 ms
Start 816 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 26 KB
Load time 18 ms
Start 817 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 26 KB
Load time 20 ms
Start 817 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 26 KB
Load time 36 ms
Start 817 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 26 KB
Load time 22 ms
Start 818 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 24 KB
Load time 23 ms
Start 818 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
1
preload
1
dns-prefetch
1
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
56 requests over 1475ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 6.0 s LCP 13.6 shttps://gu.se// https://gu.se/ — 301 — 171 B — 153 ms — http/1.1https://www.gu.se/www.gu.se/ https://www.gu.se/ — 200 — 44.5 KiB — 247 ms — http/1.1https://www.gu.se/sites/default/files/eu_cookie_compliance/eu_cookie_compliance.script.js?0www.gu.se/sites/default/files/eu_co... https://www.gu.se/sites/default/files/eu_cookie_compliance/eu_cookie_compliance.script.js?0 — 200 — 861 B — 206 ms — http/1.1https://www.gu.se/sites/default/files/css/css_jRthv8Wd6Z1NB2RGMM5SlrECvvILPa1wiTxNZuLShjQ.css?delta=0&language=sv&theme=gu_ruby&include=eJxtyEEOwyAMBMAPkfIk5JgVcuvgyJik_L499tDTSMPmyNXnSfqgJ70T_0QVUmsJs7DZS_DlOFWoM_K_LDs5UpvF574ycciFbcRS6S0pLZtRqgy2C76ydbBpGhK4paKQwiNLl_gABto6qgwww.gu.se/sites/default/files/css/c... https://www.gu.se/sites/default/files/css/css_jRthv8Wd6Z1NB2RGMM5SlrECvvILPa1wiTxNZuLShjQ.css?delta=0&language=sv&theme=gu_ruby&include=eJxtyEEOwyAMBMAPkfIk5JgVcuvgyJik_L499tDTSMPmyNXnSfqgJ70T_0QVUmsJs7DZS_DlOFWoM_K_LDs5UpvF574ycciFbcRS6S0pLZtRqgy2C76ydbBpGhK4paKQwiNLl_gABto6qg — 200 — 4.6 KiB — 130 ms — http/1.1https://www.gu.se/sites/default/files/css/css_jBG5GPZ2CP3UotHrWXQsvjsxas0-5Jb2ndgiHK-CM0k.css?delta=1&language=sv&theme=gu_ruby&include=eJxtyEEOwyAMBMAPkfIk5JgVcuvgyJik_L499tDTSMPmyNXnSfqgJ70T_0QVUmsJs7DZS_DlOFWoM_K_LDs5UpvF574ycciFbcRS6S0pLZtRqgy2C76ydbBpGhK4paKQwiNLl_gABto6qgwww.gu.se/sites/default/files/css/c... https://www.gu.se/sites/default/files/css/css_jBG5GPZ2CP3UotHrWXQsvjsxas0-5Jb2ndgiHK-CM0k.css?delta=1&language=sv&theme=gu_ruby&include=eJxtyEEOwyAMBMAPkfIk5JgVcuvgyJik_L499tDTSMPmyNXnSfqgJ70T_0QVUmsJs7DZS_DlOFWoM_K_LDs5UpvF574ycciFbcRS6S0pLZtRqgy2C76ydbBpGhK4paKQwiNLl_gABto6qg — 200 — 29.6 KiB — 194 ms — http/1.1https://www.gu.se/sites/default/files/css/css_orpyG37_oDlBF2Vjxq1PzjU0oSFnrjGoTBQ1Mfh2G-Y.css?delta=3&language=sv&theme=gu_ruby&include=eJxtyEEOwyAMBMAPkfIk5JgVcuvgyJik_L499tDTSMPmyNXnSfqgJ70T_0QVUmsJs7DZS_DlOFWoM_K_LDs5UpvF574ycciFbcRS6S0pLZtRqgy2C76ydbBpGhK4paKQwiNLl_gABto6qgwww.gu.se/sites/default/files/css/c... https://www.gu.se/sites/default/files/css/css_orpyG37_oDlBF2Vjxq1PzjU0oSFnrjGoTBQ1Mfh2G-Y.css?delta=3&language=sv&theme=gu_ruby&include=eJxtyEEOwyAMBMAPkfIk5JgVcuvgyJik_L499tDTSMPmyNXnSfqgJ70T_0QVUmsJs7DZS_DlOFWoM_K_LDs5UpvF574ycciFbcRS6S0pLZtRqgy2C76ydbBpGhK4paKQwiNLl_gABto6qg — 200 — 2.2 KiB — 151 ms — http/1.1https://www.gu.se/core/assets/vendor/jquery/jquery.min.js?v=4.0.0-rc.1www.gu.se/core/assets/vendor/jquery... https://www.gu.se/core/assets/vendor/jquery/jquery.min.js?v=4.0.0-rc.1 — 200 — 27.6 KiB — 161 ms — http/1.1https://www.gu.se/sites/default/files/js/js_2O3j8pOXIfHS8h7oVhQVaC8hfA0O5FO8ppWoYwi7hUM.js?scope=header&delta=1&language=sv&theme=gu_ruby&include=eJxtil0OAiEMhC-02iORyjZ1tICBonJ7lxcTiS_z881ID7GUO-Sw9DBwjkLyB25aipoEZyU9ZO1nvvH7F6ZNe9hH5oQYkFiFVjAfqZvDkLWz0dLnXvtlEEfHU07Nx1wmbsI1XumbtgaXF3YJbFKdkOEf-iNXTQwww.gu.se/sites/default/files/js/js... https://www.gu.se/sites/default/files/js/js_2O3j8pOXIfHS8h7oVhQVaC8hfA0O5FO8ppWoYwi7hUM.js?scope=header&delta=1&language=sv&theme=gu_ruby&include=eJxtil0OAiEMhC-02iORyjZ1tICBonJ7lxcTiS_z881ID7GUO-Sw9DBwjkLyB25aipoEZyU9ZO1nvvH7F6ZNe9hH5oQYkFiFVjAfqZvDkLWz0dLnXvtlEEfHU07Nx1wmbsI1XumbtgaXF3YJbFKdkOEf-iNXTQ — 200 — 6.8 KiB — 120 ms — http/1.1https://www.gu.se/modules/contrib/google_tag/js/gtag.js?tcpd9cwww.gu.se/modules/contrib/google_ta... https://www.gu.se/modules/contrib/google_tag/js/gtag.js?tcpd9c — 200 — 985 B — 142 ms — http/1.1https://www.gu.se/modules/contrib/google_tag/js/gtm.js?tcpd9cwww.gu.se/modules/contrib/google_ta... 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https://www.gu.se/sites/default/files/dynamic-image/dynamic_image_837_837/public/2022-02/algodling.jpg?media_id=58885&width=721&height=700 — 200 — 154.7 KiB — 207 ms — http/1.1https://www.gu.se/sites/default/files/dynamic-image/dynamic_image_690_388/public/2026-04/shutterstock_2581799135.jpg?media_id=193844&width=651&height=350www.gu.se/sites/default/files/dynam... https://www.gu.se/sites/default/files/dynamic-image/dynamic_image_690_388/public/2026-04/shutterstock_2581799135.jpg?media_id=193844&width=651&height=350 — 200 — 47.6 KiB — 106 ms — http/1.1https://www.gu.se/sites/default/files/dynamic-image/dynamic_image_690_388/public/2026-04/Ett%20HUM%20om_studera.png?media_id=193700&width=651&height=350www.gu.se/sites/default/files/dynam... https://www.gu.se/sites/default/files/dynamic-image/dynamic_image_690_388/public/2026-04/Ett%20HUM%20om_studera.png?media_id=193700&width=651&height=350 — 200 — 282.5 KiB — 68 ms — 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142 ms — http/1.1https://www.gu.se/sites/default/files/dynamic-image/dynamic_image_690_388/public/2026-04/KonstnTalatKlappa2560.jpg?media_id=193425&width=651&height=350www.gu.se/sites/default/files/dynam... https://www.gu.se/sites/default/files/dynamic-image/dynamic_image_690_388/public/2026-04/KonstnTalatKlappa2560.jpg?media_id=193425&width=651&height=350 — 200 — 39.2 KiB — 58 ms — http/1.1https://www.gu.se/sites/default/files/dynamic-image/dynamic_image_690_388/public/2026-04/TS_webb_pressfrihetens_dag_2026_1920x1080px.jpg?media_id=193225&width=651&height=350www.gu.se/sites/default/files/dynam... https://www.gu.se/sites/default/files/dynamic-image/dynamic_image_690_388/public/2026-04/TS_webb_pressfrihetens_dag_2026_1920x1080px.jpg?media_id=193225&width=651&height=350 — 200 — 98.6 KiB — 61 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 1755ms · 562KB · kr191/mo
www.gu.se
Other
Costly
Execution 834ms
Transfer 279 KB
Unused 65%
Monthly Cost kr91/mo
Unattributable
Other
Costly
Execution 321ms
Transfer 0 KB
Monthly Cost kr35/mo
www.gu.se
Other
Optional
Execution 178ms
Transfer 44 KB
Monthly Cost kr19/mo
Google Tag Manager
Tag Manager
Optional
Execution 142ms
Transfer 119 KB
Unused 56%
Monthly Cost kr15/mo
www.gu.se
Other
Optional
Execution 117ms
Transfer 7 KB
Monthly Cost kr13/mo
script.e-space.se
Other
Optional
Execution 102ms
Transfer 89 KB
Unused 54%
Monthly Cost kr11/mo
siteimproveanalytics.com
Other
Optional
Execution 62ms
Transfer 23 KB
Monthly Cost kr7/mo

These scripts may cost more than they're worth

  • www.gu.se adds 834ms and costs ~kr91/month
  • Unattributable adds 321ms and costs ~kr35/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.gu.se takes 834ms 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

65% of www.gu.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

Unattributable takes 321ms 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

56% of Google Tag Manager'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

54% of script.e-space.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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