Performance
· 17 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.
11.62 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
15.58 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
383 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.028
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
11.62 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.
21.11 s
Page Load Progression
FPage Weight BudgetAction14.9 MB transferred, 68 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
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
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
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction4034ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 1329ms | 25ms | 0ms | 3rd |
| https://www.unibo.it/it | 983ms | 175ms | 9ms | 3rd |
| https://t.contentsquare.net/uxa/80807a583d824.js | 686ms | 541ms | 64ms | 3rd |
| https://www.unibo.it/portal_javascripts/Sunburst%20Theme/resourceplone.app.jquery-cachekey-cab837a12fdbd0043cdc14b795f8e599.js | 402ms | 214ms | 57ms | 3rd |
| https://unpkg.com/leaflet@1.9.4/dist/leaflet.js | 233ms | 95ms | 19ms | 3rd |
| https://www.unibo.it/++resource++unibo.cookiebanner/unibo-cookies.min.js?v=20 | 169ms | 61ms | 14ms | 3rd |
| https://www.unibo.it/++resource++unibo.contents/splide.min.js | 118ms | 54ms | 4ms | 3rd |
| https://analytics.unibo.it/piwik.js | 59ms | 49ms | 10ms | 3rd |
| https://www.unibo.it/++theme++unibotheme.portale/scripts/lazysizes.min.js?v=2 | 53ms | 35ms | 2ms | 3rd |
FJS BundlesAction12 scripts, 628 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.unibo.it/portal_javascripts/Sunburst%20Theme/resourceplone.app.jquery-cachekey-cab837a12fdbd0043cdc14b795f8e599.js | 431 KB | 272 KB (64%) | ✓ | 3rd |
| https://www.unibo.it/portal_javascripts/Sunburst%20Theme/resourceplone.formwidget.autocompletejquery.autocomplete.min-cachekey-cde57e927f83109813f2494a935919c2.js | 161 KB | 134 KB (83%) | ✗ | 3rd |
| https://t.contentsquare.net/uxa/80807a583d824.js | 118 KB | 65 KB (55%) | ✓ | 3rd |
| https://www.unibo.it/portal_javascripts/Sunburst%20Theme/resourcegareappalto-cachekey-1f37065ba47ed82465460d9ccbe1e544.js | 96 KB | 63 KB (66%) | ✓ | 3rd |
| https://analytics.unibo.it/piwik.js | 67 KB | 37 KB (56%) | ✓ | 3rd |
| https://www.unibo.it/++resource++unibo.cookiebanner/unibo-cookies.min.js?v=20 | 96 KB | 32 KB (33%) | ✓ | 3rd |
| https://unpkg.com/leaflet@1.9.4/dist/leaflet.js | 42 KB | 25 KB (60%) | ✓ | 3rd |
| https://www.unibo.it/portal_javascripts/Sunburst%20Theme/resourceunibo.api.scripts3rdpartyinviewport.jquery-cachekey-39c0f335bc6815822e061a9e297ed847.js | 2 KB | — | ✓ | 3rd |
| https://www.unibo.it/++theme++unibotheme.portale/scripts/lazysizes.min.js?v=2 | 10 KB | — | ✓ | 3rd |
| https://www.unibo.it/++resource++unibo.contents/unibo.map.js?v=12 | 8 KB | — | ✗ | 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 InventoryAction68 resources · 14.9 MB · 628 KB savings availableFIX
~627.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 68 resources | 14.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction34 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
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 Loading9 fonts (1761 KB)PASS
Web fonts
9
1761 KB total
Render-blocking
0
of 9
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
- 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
- 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
- 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 ~922 KB and ~1844 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall68 requests over 5502msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 1329ms | 0 KB | — | €14/mo | Costly |
www.unibo.it www.unibo.it | Other | 983ms | 100 KB | — | €11/mo | Costly |
t.contentsquare.net t.contentsquare.net | Other | 686ms | 118 KB | 55% | €7/mo | Costly |
www.unibo.it www.unibo.it | Other | 402ms | 431 KB | 64% | €4/mo | Costly |
unpkg unpkg.com | CDN | 233ms | 42 KB | 60% | €3/mo | Costly |
www.unibo.it www.unibo.it | Other | 169ms | 96 KB | 33% | €2/mo | Optional |
www.unibo.it www.unibo.it | Other | 118ms | 30 KB | — | €1/mo | Optional |
analytics.unibo.it analytics.unibo.it | Other | 59ms | 67 KB | 56% | €1/mo | Optional |
www.unibo.it www.unibo.it | Other | 53ms | 10 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 1329ms and costs ~€14/month
- www.unibo.it adds 983ms and costs ~€11/month
- t.contentsquare.net adds 686ms and costs ~€7/month
- www.unibo.it adds 402ms and costs ~€4/month
- unpkg adds 233ms 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
Unattributable takes 1329ms 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.unibo.it takes 983ms 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
t.contentsquare.net takes 686ms 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 t.contentsquare.net'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
www.unibo.it takes 402ms 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
64% of www.unibo.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
unpkg takes 233ms 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
60% of unpkg'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
56% of analytics.unibo.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