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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
50
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.
96
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.

4.51 s

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

13.64 s

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

502 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.

5.35 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.

14.03 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 2 REVIEW 6 FIX
F
Page Weight Budget
Action
41.9 MB transferred, 65 requests
FIX
41.9 MB transferred, 65 requests
Critical::
Page weighs 45.2 MB (41.9 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 8.8 g CO2 per page load
41.9 MB / 2.4 MB budget
41.9 MB transferred
65 requests
8.8 g CO2 per page load
Other 31.4 MiB 75%
Images 9.6 MiB 23%
JavaScript 736.0 KiB 2%
CSS 142.9 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 (41.9 MiB of 41.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5024ms total JS execution
FIX
5024ms total JS execution
Warning::
Unattributable: 2311ms CPU time
Warning::
https://www.polimi.it/: 1289ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HCPV...: 374ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TS7...: 265ms CPU time
Info::
https://www.polimi.it/_assets/f34691673face4b5c642...: 240ms CPU time
Warning::
Third-party scripts: 5024ms (100% of total)

Main Thread Breakdown

Other 49% Script Evaluation 23% Style & Layout 13% Script Parsing & Compilation 6% Rendering 4% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
Unattributable2311ms33ms0ms3rd
https://www.polimi.it/1289ms133ms18ms3rd
https://www.googletagmanager.com/gtag/js?id=G-HCPVJRGN8W374ms297ms72ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TS7S7BXS265ms193ms62ms3rd
https://www.polimi.it/_assets/f34691673face4b5c642d176b42916a9/Library/klaro/klaro.js?1765201540240ms168ms37ms3rd
https://www.polimi.it/_assets/4b51f00386267395f41e0940abbcd656/JavaScript/Src/polimi.js?1775796139236ms188ms3ms3rd
https://cdn.jsdelivr.net/npm/swiper@11/swiper-bundle.min.js147ms23ms20ms3rd
https://www.googletagmanager.com/gtag/js?id=G-HCPVJRGN8W&cx=c&gtm=4e64k0107ms34ms72ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js56ms42ms12ms3rd
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 · 41.9 MB · 356 KB savings available
FIX
65 resources · 41.9 MB · 356 KB savings available
Warning::
Page weight 40.9 MB over 1MB target
Got: 41.9 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 · 41.9 MiB · 64 third-party 40.9 MiB over 1MB target
Media 75% · 31.4 MiB
Image 23% · 9.6 MiB
JavaScript 2% · 736.0 KiB
CSS 0% · 142.9 KiB
Document 0% · 46.2 KiB
Font 0% · 33.5 KiB
Other 0% · 704 B

~355.9 KiB of savings available

Remove unused JavaScript: 355.9 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/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.
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.
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
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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 4.5 s LCP 13.6 shttps://fonts.gstatic.com/s/manrope/v20/xn7gYHE41ni1AdIRggexSvfedN4.woff2xn7gYHE41ni1AdIRggexSvf... https://fonts.gstatic.com/s/manrope/v20/xn7gYHE41ni1AdIRggexSvfedN4.woff2 — 24.0 KiB — 14 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 — 407 ms — font-display: swap
xn7gYHE41ni1AdIRggexSvf... woff2 swap
Size 24 KB
Load time 14 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
icomoon.ttf ttf swap
Size 9 KB
Load time 407 ms
Start 1.6 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
—
prefetch
—

2 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
65 requests over 18603ms
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 FCP 4.5 s LCP 13.6 shttps://polimi.it// https://polimi.it/ — 301 — 143 B — 666 ms — h2https://www.polimi.it/www.polimi.it/ https://www.polimi.it/ — 200 — 46.0 KiB — 686 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 — 308 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 — 310 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 — 472 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 — 27.6 KiB — 26 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 — 5.1 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 — 313 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 — 10.9 KiB — 28 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 — 309 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 — 303 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 — 18 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 — 325 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 — 476 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 — 490 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 — 483 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 — 483 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 — 30 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 — 22 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 — 481 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 — 58 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 — 48 ms — h2https://ingestion.webanalytics.italia.it/matomo.jsingestion.webanalytics.italia.it/ma... https://ingestion.webanalytics.italia.it/matomo.js — 200 — 65.6 KiB — 870 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 — 25 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 — 445 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 — 14 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 — 407 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 — 14 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 — 20 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 FCP 4.5 s LCP 13.6 shttps://polimi.it// https://polimi.it/ — 301 — 143 B — 666 ms — h2https://www.polimi.it/www.polimi.it/ https://www.polimi.it/ — 200 — 46.0 KiB — 686 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 — 308 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 — 310 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 5024ms · 678KB · €55/mo
Unattributable
Other
Costly
Execution 2311ms
Transfer 0 KB
Monthly Cost €25/mo
www.polimi.it
Other
Costly
Execution 1289ms
Transfer 46 KB
Monthly Cost €14/mo
Google Tag Manager
Tag Manager
Costly
Execution 374ms
Transfer 173 KB
Unused 41%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 265ms
Transfer 149 KB
Unused 54%
Monthly Cost €3/mo
www.polimi.it
Other
Costly
Execution 240ms
Transfer 57 KB
Monthly Cost €3/mo
www.polimi.it
Other
Costly
Execution 236ms
Transfer 6 KB
Monthly Cost €3/mo
jsDelivr
CDN
Optional
Execution 147ms
Transfer 43 KB
Unused 65%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 107ms
Transfer 173 KB
Unused 67%
Monthly Cost €1/mo
ajax.googleapis.com
Other
Optional
Execution 56ms
Transfer 30 KB
Unused 76%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 2311ms and costs ~€25/month
  • www.polimi.it adds 1289ms and costs ~€14/month
  • Google Tag Manager adds 374ms and costs ~€4/month
  • Google Tag Manager adds 265ms and costs ~€3/month
  • www.polimi.it adds 240ms and costs ~€3/month
  • www.polimi.it adds 236ms and costs ~€3/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 2311ms 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 1289ms 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

Google Tag Manager takes 374ms 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

Google Tag Manager takes 265ms 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

www.polimi.it takes 240ms 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 236ms 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 jsDelivr'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

67% 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

76% of ajax.googleapis.com'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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