Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.13 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.66 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
304 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.001
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.65 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.
5.12 s
Page Load Progression
FPage Weight BudgetAction17.4 MB transferred, 188 requestsFIX
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2104ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.unipd.it/_next/static/chunks/da8a57391d249a2f.js | 818ms | 618ms | 6ms | 3rd |
| https://www.unipd.it/ | 493ms | 39ms | 52ms | 3rd |
| Unattributable | 236ms | 12ms | 0ms | 3rd |
| https://www.unipd.it/_next/static/chunks/3bc8e9950183d5ef.js | 180ms | 30ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-608956197&cx=c>m=4e64k0 | 120ms | 99ms | 20ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NC7RRGD | 80ms | 65ms | 12ms | 3rd |
| https://consent.cookiebot.eu/6ac4eb1a-01b6-4600-be5d-a4ef2ebdd213/cc.js?renew=false&referer=www.unipd.it&dnt=false&init=false | 75ms | 35ms | 7ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-11111625403&cx=c>m=4e64k0 | 51ms | 41ms | 9ms | 3rd |
| https://www.unipd.it/_next/static/chunks/ee00070b57b20554.js | 51ms | 14ms | 3ms | 3rd |
FJS BundlesAction53 scripts, 564 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.eye-able.com/public/js/eyeAble.js | 145 KB | 99 KB (69%) | ✓ | 3rd |
| https://www.unipd.it/_next/static/chunks/99b45d2424516508.js | 123 KB | 94 KB (77%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-B3WV5DRLH0&cx=c>m=4e64k0 | 135 KB | 84 KB (63%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-11111625403&cx=c>m=4e64k0 | 143 KB | 66 KB (46%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NC7RRGD | 151 KB | 61 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-608956197&cx=c>m=4e64k0 | 174 KB | 59 KB (34%) | ✓ | 3rd |
| https://ingestion.webanalytics.italia.it/matomo.js | 66 KB | 36 KB (57%) | ✓ | 3rd |
| https://www.unipd.it/_next/static/chunks/ee00070b57b20554.js | 40 KB | 22 KB (55%) | ✓ | 3rd |
| https://www.unipd.it/_next/static/chunks/c49deea11a2ca976.js | 22 KB | 21 KB (99%) | ✓ | 3rd |
| https://www.unipd.it/_next/static/chunks/da8a57391d249a2f.js | 66 KB | 20 KB (31%) | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction188 resources · 17.4 MB · 564 KB savings availableFIX
~563.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 188 resources | 17.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization25 images, 0 KB saveableREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading5 fonts (962 KB)PASS
Web fonts
5
962 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
- 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 ~657 KB and ~1314 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall188 requests over 3997msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.unipd.it www.unipd.it | Other | 818ms | 66 KB | 31% | €9/mo | Costly |
www.unipd.it www.unipd.it | Other | 493ms | 333 KB | — | €5/mo | Costly |
Unattributable Unattributable | Other | 236ms | 0 KB | — | €3/mo | Costly |
www.unipd.it www.unipd.it | Other | 180ms | 7 KB | — | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 120ms | 174 KB | 34% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 80ms | 151 KB | 40% | €1/mo | Optional |
consent.cookiebot.eu consent.cookiebot.eu | Other | 75ms | 79 KB | — | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 51ms | 143 KB | 46% | €1/mo | Optional |
www.unipd.it www.unipd.it | Other | 51ms | 40 KB | 55% | €1/mo | Optional |
These scripts may cost more than they're worth
- www.unipd.it adds 818ms and costs ~€9/month
- www.unipd.it adds 493ms and costs ~€5/month
- Unattributable adds 236ms and costs ~€3/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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.unipd.it takes 818ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.unipd.it takes 493ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 236ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
55% of www.unipd.it's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev