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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
70
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
84
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.

2.20 s

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

2.90 s

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

10 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.

2.59 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.

3.37 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
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
6.9 MB transferred, 99 requests
FIX
6.9 MB transferred, 99 requests
Critical::
Page weighs 9.0 MB (6.9 MB transferred)
Warning::
Images are 5.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.8 MB
Warning::
JavaScript is 756 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 756 KB
Info::
99 HTTP requests
Info::
Estimated 1.4 g CO2 per page load
6.9 MB / 2.4 MB budget
6.9 MB transferred
99 requests
1.4 g CO2 per page load
Images 5.8 MiB 84%
JavaScript 755.6 KiB 11%
CSS 198.3 KiB 3%
Fonts 116.8 KiB 2%
Other 37.2 KiB 1%
HTML 25.1 KiB 0%
Other 15.7 KiB 0%
Other 2.6 KiB 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 (6.9 MiB of 6.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
22 scripts, 299 KB unused
FIX
22 scripts, 299 KB unused
Warning::
https://www.upc.edu/++plone++production/++unique++...: 92 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.upc.edu/++plone++production/++unique++...: unminified — 20 KB could be saved
Warning::
https://www.googletagmanager.com/gtag/js?id=G-SR6Z...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-P80Z...: 62 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://app.usercentrics.eu/browser-ui/3.99.0/inde...: 53 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://app.usercentrics.eu/browser-ui/3.99.0/Virt...: 25 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 299 KB
299 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.js177 KB92 KB (54%)✗3rd
https://www.googletagmanager.com/gtag/js?id=G-SR6Z9ZZ2SJ&cx=c&gtm=4e64k0157 KB67 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-P80Z250TEZ155 KB62 KB (40%)✓3rd
https://app.usercentrics.eu/browser-ui/3.99.0/index.module.js121 KB53 KB (44%)✓3rd
https://app.usercentrics.eu/browser-ui/3.99.0/VirtualServiceItem-e4cab338.js49 KB25 KB (51%)✓3rd
https://app.usercentrics.eu/browser-ui/3.99.0/DefaultUI-4ed6068b-1cf25503.js1 KB—✓3rd
https://app.usercentrics.eu/browser-ui/3.99.0/ButtonsCustomization-eaf3a10e-db464fbf.js0 KB—✓3rd
https://www.upc.edu/++theme++homeupc/assets/javascripts/homeupc-compiled.js?version=2020-02-13%2000%3A00%3A00.00000312 KB—✓3rd
https://www.clarity.ms/tag/kmoetwnpkj1 KB—✓3rd
https://app.usercentrics.eu/browser-ui/3.99.0/DefaultData-3e2b2c3c-a6380bf2.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

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
99 resources · 6.9 MB · 299 KB savings available
FIX
99 resources · 6.9 MB · 299 KB savings available
Warning::
Page weight 5.9 MB over 1MB target
Got: 6.9 MB Expected: ≤ 1 MB
Info::
~299 KB of savings available
Warning::
98 third-party resources (100% of weight)
Info::
6 resources over 200KB
99 resources · 6.9 MiB · 98 third-party 5.9 MiB over 1MB target
Image 84% · 5.8 MiB
JavaScript 11% · 755.6 KiB
CSS 3% · 198.3 KiB
Font 2% · 116.8 KiB
Document 0% · 25.4 KiB
Other 0% · 21.2 KiB

~299.0 KiB of savings available

Remove unused JavaScript: 299.0 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
45 images, 0 KB saveable
REVIEW
45 images, 0 KB saveable
Warning::
https://www.upc.edu/ca/continguts-home/espai-multi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upc.edu/ca/media/destacats-home/sense-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upc.edu/++theme++homeupc/assets/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upc.edu/ca/continguts-home/promocio/se... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upc.edu/ca/continguts-home/promocio/la... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upc.edu/ca/media/destacats-home/formul... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upc.edu/ca/continguts-home/espai-multi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upc.edu/ca/media/destacats-home/esport... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.upc.edu/ca/continguts-home/espai-multi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
45 images 5.8 MB
0 oversized -0 KB
44 legacy format
9 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

C
JS Execution Cost
Action
1187ms total JS execution
REVIEW
1187ms total JS execution
Warning::
https://www.upc.edu/ca: 341ms CPU time
Info::
Unattributable: 219ms CPU time
Info::
https://app.usercentrics.eu/browser-ui/3.99.0/inde...: 181ms CPU time
Info::
https://www.upc.edu/++plone++production/++unique++...: 167ms CPU time
Info::
https://scripts.clarity.ms/0.8.59/clarity.js: 111ms CPU time
Warning::
Third-party scripts: 1187ms (100% of total)

Main Thread Breakdown

Script Evaluation 44% Style & Layout 27% Other 18% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.upc.edu/ca341ms5ms1ms3rd
Unattributable219ms20ms0ms3rd
https://app.usercentrics.eu/browser-ui/3.99.0/index.module.js181ms150ms1ms3rd
https://www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.js167ms80ms19ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js111ms101ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-SR6Z9ZZ2SJ&cx=c&gtm=4e64k096ms77ms17ms3rd
https://www.googletagmanager.com/gtag/js?id=G-P80Z250TEZ71ms56ms14ms3rd
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 (117 KB)
PASS
7 fonts (117 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

117 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 FCP 2.2 s LCP 2.9 shttps://www.upc.edu/++theme++homeupc/assets/fonts/roboto/KFOlCnqEu92Fr1MmEU9fBBc4.woff2KFOlCnqEu92Fr1MmEU9fBBc... https://www.upc.edu/++theme++homeupc/assets/fonts/roboto/KFOlCnqEu92Fr1MmEU9fBBc4.woff2 — 17.2 KiB — 106 ms — font-display: swaphttps://www.upc.edu/++theme++homeupc/assets/fonts/roboto/KFOlCnqEu92Fr1MmSU5fBBc4.woff2KFOlCnqEu92Fr1MmSU5fBBc... https://www.upc.edu/++theme++homeupc/assets/fonts/roboto/KFOlCnqEu92Fr1MmSU5fBBc4.woff2 — 17.0 KiB — 107 ms — font-display: swaphttps://www.upc.edu/++theme++homeupc/assets/fonts/upc-icones.ttf?40tf5eupc-icones.ttf https://www.upc.edu/++theme++homeupc/assets/fonts/upc-icones.ttf?40tf5e — 10.0 KiB — 113 ms — font-display: swaphttps://www.upc.edu/++theme++homeupc/assets/fonts/roboto/KFOlCnqEu92Fr1MmWUlfBBc4.woff2KFOlCnqEu92Fr1MmWUlfBBc... https://www.upc.edu/++theme++homeupc/assets/fonts/roboto/KFOlCnqEu92Fr1MmWUlfBBc4.woff2 — 17.1 KiB — 109 ms — font-display: swapdata:application/font-woff2;base64,d09GMgABAAAAAEZsAA8AAAAAsVwAAEYJAAECTQAAAAAAAAAAAAAAAAAAAAAAAAAA…font-woff2;base64,d09GM... data:application/font-woff2;base64,d09GMgABAAAAAEZsAA8AAAAAsVwAAEYJAAECTQAAAAAAAAAAAAAAAAAAAAAAAAAA… — 17.6 KiB — 215 ms — font-display: swaphttps://www.upc.edu/++theme++homeupc/assets/fonts/roboto/KFOjCnqEu92Fr1Mu51TjASc6CsQ.woff2KFOjCnqEu92Fr1Mu51TjASc... https://www.upc.edu/++theme++homeupc/assets/fonts/roboto/KFOjCnqEu92Fr1Mu51TjASc6CsQ.woff2 — 18.7 KiB — 163 ms — font-display: swaphttps://www.upc.edu/++theme++homeupc/assets/fonts/bootstrap/glyphicons-halflings-regular.woff2glyphicons-halflings-re... https://www.upc.edu/++theme++homeupc/assets/fonts/bootstrap/glyphicons-halflings-regular.woff2 — 19.2 KiB — 186 ms — font-display: swap
KFOlCnqEu92Fr1MmEU9fBBc... woff2 swap
Size 17 KB
Load time 106 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
KFOlCnqEu92Fr1MmSU5fBBc... woff2 swap
Size 17 KB
Load time 107 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
upc-icones.ttf ttf swap
Size 10 KB
Load time 113 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
KFOlCnqEu92Fr1MmWUlfBBc... woff2 swap
Size 17 KB
Load time 109 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
font-woff2;base64,d09GM... woff2 swap
Size 18 KB
Load time 215 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
KFOjCnqEu92Fr1Mu51TjASc... woff2 swap
Size 19 KB
Load time 163 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
glyphicons-halflings-re... woff2 swap
Size 19 KB
Load time 186 ms
Start 1.7 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)

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
99 requests over 4570ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.2 s LCP 2.9 shttps://upc.edu// https://upc.edu/ — 301 — 318 B — 418 ms — http/1.1https://www.upc.edu/www.upc.edu/ https://www.upc.edu/ — 301 — 1.8 KiB — 414 ms — http/1.1https://www.upc.edu/cawww.upc.edu/ca https://www.upc.edu/ca — 200 — 22.4 KiB — 105 ms — http/1.1https://app.usercentrics.eu/browser-ui/latest/loader.jsapp.usercentrics.eu/browser-ui/late... https://app.usercentrics.eu/browser-ui/latest/loader.js — 200 — 10.8 KiB — 34 ms — h2https://privacy-proxy.usercentrics.eu/latest/uc-block.bundle.jsprivacy-proxy.usercentrics.eu/lates... https://privacy-proxy.usercentrics.eu/latest/uc-block.bundle.js — 200 — 30.5 KiB — 71 ms — h2https://www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.csswww.upc.edu/++plone++production/++u... https://www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.css — 200 — 152.4 KiB — 201 ms — http/1.1https://www.upc.edu/++theme++homeupc/assets/css/homeupc-compiled.css?version=2020-02-13%2000%3A00%3A00.000003www.upc.edu/++theme++homeupc/assets... https://www.upc.edu/++theme++homeupc/assets/css/homeupc-compiled.css?version=2020-02-13%2000%3A00%3A00.000003 — 200 — 28.1 KiB — 302 ms — http/1.1https://www.upc.edu/++theme++homeupc/assets/css/upc.css?version=2026-01-26%2011%3A00%3A00www.upc.edu/++theme++homeupc/assets... https://www.upc.edu/++theme++homeupc/assets/css/upc.css?version=2026-01-26%2011%3A00%3A00 — 200 — 17.9 KiB — 292 ms — http/1.1https://www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.jswww.upc.edu/++plone++production/++u... https://www.upc.edu/++plone++production/++unique++2026-01-26T16:39:10.719273/default.js — 200 — 176.9 KiB — 473 ms — http/1.1https://www.upc.edu/++theme++homeupc/assets/javascripts/homeupc-compiled.js?version=2020-02-13%2000%3A00%3A00.000003www.upc.edu/++theme++homeupc/assets... https://www.upc.edu/++theme++homeupc/assets/javascripts/homeupc-compiled.js?version=2020-02-13%2000%3A00%3A00.000003 — 200 — 11.7 KiB — 302 ms — http/1.1https://www.upc.edu/++theme++homeupc/assets/javascripts/upc.min.js?version=2023-07-18%2000%3A00%3A00.000001www.upc.edu/++theme++homeupc/assets... https://www.upc.edu/++theme++homeupc/assets/javascripts/upc.min.js?version=2023-07-18%2000%3A00%3A00.000001 — 200 — 3.0 KiB — 299 ms — http/1.1https://app.usercentrics.eu/browser-ui/3.99.0/index.module.jsapp.usercentrics.eu/browser-ui/3.99... https://app.usercentrics.eu/browser-ui/3.99.0/index.module.js — 200 — 120.7 KiB — 38 ms — h3https://api.usercentrics.eu/settings/k73tMWYfS/latest/languages.jsonapi.usercentrics.eu/settings/k73tMW... https://api.usercentrics.eu/settings/k73tMWYfS/latest/languages.json — 200 — 0 B — 127 ms — h2https://www.upc.edu/++theme++homeupc/assets/images/Logo.svgwww.upc.edu/++theme++homeupc/assets... https://www.upc.edu/++theme++homeupc/assets/images/Logo.svg — 200 — 5.4 KiB — 125 ms — http/1.1https://api.usercentrics.eu/settings/k73tMWYfS/latest/languages.jsonapi.usercentrics.eu/settings/k73tMW... https://api.usercentrics.eu/settings/k73tMWYfS/latest/languages.json — 200 — 600 B — 14 ms — h2https://api.usercentrics.eu/settings/k73tMWYfS/latest/ca.jsonapi.usercentrics.eu/settings/k73tMW... https://api.usercentrics.eu/settings/k73tMWYfS/latest/ca.json — 200 — 0 B — 107 ms — h3https://www.upc.edu/ca/media/fons_destacat_menu_carbassa.jpg/@@images/d5176ec6-82bd-40fa-9f51-7bc6bba44b2d.jpegwww.upc.edu/ca/media/fons_destacat_... https://www.upc.edu/ca/media/fons_destacat_menu_carbassa.jpg/@@images/d5176ec6-82bd-40fa-9f51-7bc6bba44b2d.jpeg — 200 — 14.3 KiB — 96 ms — http/1.1https://www.upc.edu/ca/media/fons_destacat_menu_blau.jpg/@@images/55782bcc-06e8-4f51-8079-ca3ccacc6777.jpegwww.upc.edu/ca/media/fons_destacat_... https://www.upc.edu/ca/media/fons_destacat_menu_blau.jpg/@@images/55782bcc-06e8-4f51-8079-ca3ccacc6777.jpeg — 200 — 12.3 KiB — 95 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 1187ms · 658KB · €13/mo
www.upc.edu
Other
Costly
Execution 341ms
Transfer 22 KB
Monthly Cost €4/mo
Unattributable
Other
Costly
Execution 219ms
Transfer 0 KB
Monthly Cost €2/mo
app.usercentrics.eu
Other
Optional
Execution 181ms
Transfer 121 KB
Unused 44%
Monthly Cost €2/mo
www.upc.edu
Other
Optional
Execution 167ms
Transfer 177 KB
Unused 54%
Monthly Cost €2/mo
Microsoft Clarity
Session Replay
Optional
Execution 111ms
Transfer 26 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 96ms
Transfer 157 KB
Unused 43%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 71ms
Transfer 155 KB
Unused 40%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.upc.edu adds 341ms and costs ~€4/month
  • Unattributable adds 219ms and costs ~€2/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.upc.edu takes 341ms 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

Unattributable takes 219ms 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 www.upc.edu'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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