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https://polimi.it

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
61
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.
85
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.

1.84 s

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

4.84 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.

0.003

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

6.09 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.

4.97 s

Page Load Progression

2.7 s
5.5 s
8.2 s
10.9 s
13.7 s
16.4 s
19.2 s
21.9 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
45.4 MB transferred, 65 requests
FIX
45.4 MB transferred, 65 requests
Critical::
Page weighs 48.6 MB (45.4 MB transferred)
Warning::
Images are 9.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 9.6 MB
Warning::
JavaScript is 736 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 736 KB
Info::
65 HTTP requests
Info::
Estimated 9.5 g CO2 per page load
45.4 MB / 2.4 MB budget
45.4 MB transferred
65 requests
9.5 g CO2 per page load
Other 34.8 MiB 77%
Images 9.6 MiB 21%
JavaScript 736.0 KiB 2%
CSS 142.7 KiB 0%
HTML 46.0 KiB 0%
Fonts 33.5 KiB 0%
Other 3.8 KiB 0%
Other 704 B 0%
Other 0 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

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 (45.4 MiB of 45.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
13 scripts, 356 KB unused
FIX
13 scripts, 356 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HCPV...: 116 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TS7...: 80 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HCPV...: 71 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ingestion.webanalytics.italia.it/matomo.js: 38 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.jsdelivr.net/npm/swiper@11/swiper-bund...: 28 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 356 KB
356 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-HCPVJRGN8W&cx=c&gtm=4e64k0173 KB116 KB (67%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TS7S7BXS149 KB80 KB (54%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-HCPVJRGN8W173 KB71 KB (41%)✓3rd
https://ingestion.webanalytics.italia.it/matomo.js66 KB38 KB (59%)✓3rd
https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.js43 KB28 KB (65%)✓3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js30 KB23 KB (76%)✓3rd
https://www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/JavaScript/Src/polimi.js?17757961396 KB—✗3rd
https://snippet.maze.co/maze-universal-loader.js?apiKey=e0283946-5145-4bcc-bfbf-b5f7b06355443 KB—✓3rd
https://snippet.maze.co/static/a781255f69f061920ab1239aae3d3498a242233c/contextualScaffold.js7 KB—✓3rd
https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js24 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
65 resources · 45.4 MB · 356 KB savings available
FIX
65 resources · 45.4 MB · 356 KB savings available
Warning::
Page weight 44.4 MB over 1MB target
Got: 45.4 MB Expected: ≤ 1 MB
Info::
~356 KB of savings available
Warning::
64 third-party resources (100% of weight)
Info::
12 resources over 200KB
65 resources · 45.4 MiB · 64 third-party 44.4 MiB over 1MB target
Media 77% · 34.8 MiB
Image 21% · 9.6 MiB
JavaScript 2% · 736.0 KiB
CSS 0% · 142.7 KiB
Document 0% · 46.2 KiB
Font 0% · 33.5 KiB
Other 0% · 704 B

~356.0 KiB of savings available

Remove unused JavaScript: 356.0 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
29 images, 0 KB saveable
REVIEW
29 images, 0 KB saveable
Warning::
https://www.polimi.it/fileadmin/asset/logo/banner-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.polimi.it/fileadmin/asset/logo/Logo_Un... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.polimi.it/fileadmin/asset/logo/banner-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.polimi.it/fileadmin/asset/logo/IDEA_Le... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.polimi.it/fileadmin/_processed_/c/3/cs... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
29 images 9.6 MB
0 oversized -0 KB
29 legacy format
5 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

C
JS Execution Cost
Action
1253ms total JS execution
REVIEW
1253ms total JS execution
Warning::
Unattributable: 627ms CPU time
Warning::
https://www.polimi.it/: 342ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-HCPV...: 92ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-TS7...: 72ms CPU time
Info::
https://www.polimi.it/_assets/4b51f00386267395f41e...: 64ms CPU time
Warning::
Third-party scripts: 1253ms (100% of total)

Main Thread Breakdown

Other 48% Script Evaluation 23% Style & Layout 15% Script Parsing & Compilation 6% Parse HTML & CSS 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable627ms16ms0ms3rd
https://www.polimi.it/342ms27ms4ms3rd
https://www.googletagmanager.com/gtag/js?id=G-HCPVJRGN8W92ms74ms18ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TS7S7BXS72ms53ms15ms3rd
https://www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/JavaScript/Src/polimi.js?177579613964ms53ms1ms3rd
https://www.polimi.it/_assets/f34691673face4b5c642d176b42916a9/Library/klaro/klaro.js?176520154056ms40ms7ms3rd
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
2 fonts (33 KB)
PASS
2 fonts (33 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

33 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.8 s LCP 4.8 shttps://fonts.gstatic.com/s/manrope/v20/xn7gYHE41ni1AdIRggexSvfedN4.woff2xn7gYHE41ni1AdIRggexSvf... https://fonts.gstatic.com/s/manrope/v20/xn7gYHE41ni1AdIRggexSvfedN4.woff2 — 24.0 KiB — 5 ms — font-display: swaphttps://www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/Css/fonts/icomoon.ttf?a7jh8iicomoon.ttf https://www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/Css/fonts/icomoon.ttf?a7jh8i — 9.4 KiB — 380 ms — font-display: swap
xn7gYHE41ni1AdIRggexSvf... woff2 swap
Size 24 KB
Load time 5 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
icomoon.ttf ttf swap
Size 9 KB
Load time 380 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~3 KB and ~6 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
65 requests over 19580ms
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 FCP 1.8 s LCP 4.8 shttps://polimi.it// https://polimi.it/ — 301 — 143 B — 495 ms — h2https://www.polimi.it/www.polimi.it/ https://www.polimi.it/ — 200 — 46.0 KiB — 672 ms — h2https://www.polimi.it/typo3temp/assets/css/e7e212200e72edb6153da3c9aedf7517.css?1774719989www.polimi.it/typo3temp/assets/css/... https://www.polimi.it/typo3temp/assets/css/e7e212200e72edb6153da3c9aedf7517.css?1774719989 — 200 — 582 B — 313 ms — h2https://www.polimi.it/_assets/95f1fea155c1725894ea138b1edbb31d/Scss/corsi.css?1775043311www.polimi.it/_assets/95f1fea155c17... https://www.polimi.it/_assets/95f1fea155c1725894ea138b1edbb31d/Scss/corsi.css?1775043311 — 200 — 489 B — 314 ms — h2https://www.polimi.it/typo3temp/assets/bootstrappackage/css/theme-8ec6393bb66a2620517b0c161e7037628e44b375a05b23dd75a1ab4b0311a8a2.css?1774626428www.polimi.it/typo3temp/assets/boot... https://www.polimi.it/typo3temp/assets/bootstrappackage/css/theme-8ec6393bb66a2620517b0c161e7037628e44b375a05b23dd75a1ab4b0311a8a2.css?1774626428 — 200 — 50.1 KiB — 477 ms — h2https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.csscdn.jsdelivr.net/npm/bootstrap@5.3.... https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css — 200 — 27.2 KiB — 29 ms — h2https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.csscdn.jsdelivr.net/npm/swiper@11/swip... https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.css — 200 — 5.4 KiB — 25 ms — h2https://www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/Css/polimi.css?1775796139www.polimi.it/_assets/4b51f00386267... https://www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/Css/polimi.css?1775796139 — 200 — 40.2 KiB — 319 ms — h2https://unicons.iconscout.com/release/v4.0.8/css/line.cssunicons.iconscout.com/release/v4.0.... https://unicons.iconscout.com/release/v4.0.8/css/line.css — 200 — 10.8 KiB — 30 ms — h3https://www.polimi.it/_assets/f34691673face4b5c642d176b42916a9/Stylesheet/style.css?1765201540www.polimi.it/_assets/f34691673face... https://www.polimi.it/_assets/f34691673face4b5c642d176b42916a9/Stylesheet/style.css?1765201540 — 200 — 5.7 KiB — 314 ms — h2https://www.polimi.it/_assets/f6ef6adaf5c92bf687a31a3adbcb0f7b/Css/news-basic.css?1763667245www.polimi.it/_assets/f6ef6adaf5c92... https://www.polimi.it/_assets/f6ef6adaf5c92bf687a31a3adbcb0f7b/Css/news-basic.css?1763667245 — 200 — 1.2 KiB — 312 ms — h2https://fonts.googleapis.com/css2?family=Manrope:wght@500;700&display=swapfonts.googleapis.com/css2?family=Ma... https://fonts.googleapis.com/css2?family=Manrope:wght@500;700&display=swap — 200 — 1.1 KiB — 17 ms — h2https://www.polimi.it/fileadmin/asset/video/covers/0_technology.jpgwww.polimi.it/fileadmin/asset/video... https://www.polimi.it/fileadmin/asset/video/covers/0_technology.jpg — 200 — 61.3 KiB — 323 ms — h2https://www.polimi.it/fileadmin/asset/video/covers/1_ricerca.jpgwww.polimi.it/fileadmin/asset/video... https://www.polimi.it/fileadmin/asset/video/covers/1_ricerca.jpg — 200 — 171.0 KiB — 467 ms — h2https://www.polimi.it/fileadmin/asset/video/covers/2_didattica.jpgwww.polimi.it/fileadmin/asset/video... https://www.polimi.it/fileadmin/asset/video/covers/2_didattica.jpg — 200 — 380.8 KiB — 472 ms — h2https://www.polimi.it/fileadmin/asset/video/covers/3_sostenibilita.jpgwww.polimi.it/fileadmin/asset/video... https://www.polimi.it/fileadmin/asset/video/covers/3_sostenibilita.jpg — 200 — 201.9 KiB — 462 ms — h2https://www.polimi.it/fileadmin/asset/logo/banner-enhance-logo.pngwww.polimi.it/fileadmin/asset/logo/... https://www.polimi.it/fileadmin/asset/logo/banner-enhance-logo.png — 200 — 33.0 KiB — 463 ms — h2https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js — 200 — 30.4 KiB — 32 ms — h2https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.jscdn.jsdelivr.net/npm/bootstrap@5.3.... https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js — 200 — 24.3 KiB — 22 ms — h2https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.jscdn.jsdelivr.net/npm/swiper@11/swip... https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.js — 200 — 43.4 KiB — 24 ms — h2https://www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/JavaScript/Src/polimi.js?1775796139www.polimi.it/_assets/4b51f00386267... https://www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/JavaScript/Src/polimi.js?1775796139 — 200 — 5.6 KiB — 312 ms — h2https://www.googletagmanager.com/gtag/js?id=G-HCPVJRGN8Wwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-HCPVJRGN8W — 200 — 172.9 KiB — 51 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-TS7S7BXSwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TS7S7BXS — 200 — 149.3 KiB — 36 ms — h2https://ingestion.webanalytics.italia.it/matomo.jsingestion.webanalytics.italia.it/ma... https://ingestion.webanalytics.italia.it/matomo.js — 200 — 65.6 KiB — 826 ms — http/1.1https://snippet.maze.co/maze-universal-loader.js?apiKey=e0283946-5145-4bcc-bfbf-b5f7b0635544snippet.maze.co/maze-universal-load... https://snippet.maze.co/maze-universal-loader.js?apiKey=e0283946-5145-4bcc-bfbf-b5f7b0635544 — 200 — 2.9 KiB — 16 ms — http/1.1https://www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/Images/logo.svgwww.polimi.it/_assets/4b51f00386267... https://www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/Images/logo.svg — 200 — 70.6 KiB — 420 ms — h2https://fonts.gstatic.com/s/manrope/v20/xn7gYHE41ni1AdIRggexSvfedN4.woff2fonts.gstatic.com/s/manrope/v20/xn7... https://fonts.gstatic.com/s/manrope/v20/xn7gYHE41ni1AdIRggexSvfedN4.woff2 — 200 — 24.0 KiB — 5 ms — h3https://www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/Css/fonts/icomoon.ttf?a7jh8iwww.polimi.it/_assets/4b51f00386267... https://www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/Css/fonts/icomoon.ttf?a7jh8i — 200 — 9.4 KiB — 380 ms — h2https://snippet.maze.co/static/a781255f69f061920ab1239aae3d3498a242233c/contextualScaffold.jssnippet.maze.co/static/a781255f69f0... https://snippet.maze.co/static/a781255f69f061920ab1239aae3d3498a242233c/contextualScaffold.js — 200 — 6.5 KiB — 16 ms — h3https://www.googletagmanager.com/gtag/js?id=G-HCPVJRGN8W&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-HCPVJRGN8W&cx=c&gtm=4e64k0 — 200 — 172.9 KiB — 33 ms — h2
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 FCP 1.8 s LCP 4.8 shttps://polimi.it// https://polimi.it/ — 301 — 143 B — 495 ms — h2https://www.polimi.it/www.polimi.it/ https://www.polimi.it/ — 200 — 46.0 KiB — 672 ms — h2https://www.polimi.it/typo3temp/assets/css/e7e212200e72edb6153da3c9aedf7517.css?1774719989www.polimi.it/typo3temp/assets/css/... https://www.polimi.it/typo3temp/assets/css/e7e212200e72edb6153da3c9aedf7517.css?1774719989 — 200 — 582 B — 313 ms — h2https://www.polimi.it/_assets/95f1fea155c1725894ea138b1edbb31d/Scss/corsi.css?1775043311www.polimi.it/_assets/95f1fea155c17... https://www.polimi.it/_assets/95f1fea155c1725894ea138b1edbb31d/Scss/corsi.css?1775043311 — 200 — 489 B — 314 ms — h2https://www.polimi.it/typo3temp/assets/bootstrappackage/css/theme-8ec6393bb66a2620517b0c161e7037628e44b375a05b23dd75a1ab4b0311a8a2.css?1774626428www.polimi.it/typo3temp/assets/boot... 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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 1253ms · 431KB · €14/mo
Unattributable
Other
Costly
Execution 627ms
Transfer 0 KB
Monthly Cost €7/mo
www.polimi.it
Other
Costly
Execution 342ms
Transfer 46 KB
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Optional
Execution 92ms
Transfer 173 KB
Unused 41%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 72ms
Transfer 149 KB
Unused 54%
Monthly Cost €1/mo
www.polimi.it
Other
Optional
Execution 64ms
Transfer 6 KB
Monthly Cost €1/mo
www.polimi.it
Other
Optional
Execution 56ms
Transfer 57 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 627ms and costs ~€7/month
  • www.polimi.it adds 342ms and costs ~€4/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

Unattributable takes 627ms 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.polimi.it takes 342ms 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

54% 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

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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