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.
5.00 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
9.01 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
475 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.
5.00 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.
9.11 s
Page Load Progression
FPage Weight BudgetAction5.1 MB transferred, 79 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction3513ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.labiennale.org/it | 1248ms | 5ms | 3ms | 3rd |
| https://static.labiennale.org/files/js/js_siAzsLQXar6_8hnne92BaBQNphQqqLqTxKnhobUkxPk.js | 1155ms | 534ms | 16ms | 3rd |
| Unattributable | 420ms | 6ms | 0ms | 3rd |
| https://consent.cookiebot.com/74679177-89ae-4133-b283-6728c4a7e16f/cc.js?renew=false&referer=www.labiennale.org&dnt=false&init=false | 278ms | 117ms | 41ms | 3rd |
| https://static.labiennale.org/files/js/js_T_s-Vel_gIhI-8pVHSpMba7BFDRWM7Vrs9weHs-QaJ4.js | 232ms | 88ms | 78ms | 3rd |
| https://consent.cookiebot.com/uc.js | 180ms | 147ms | 14ms | 3rd |
DPage Weight InventoryAction79 resources · 5.1 MB · 114 KB savings availableFIX
~114.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 79 resources | 5.1 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction53 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
CJS BundlesAction9 scripts, 114 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://static.labiennale.org/files/js/js_T_s-Vel_gIhI-8pVHSpMba7BFDRWM7Vrs9weHs-QaJ4.js | 143 KB | 89 KB (63%) | ✗ | 3rd |
| https://consent.cookiebot.com/74679177-89ae-4133-b283-6728c4a7e16f/cc.js?renew=false&referer=www.labiennale.org&dnt=false&init=false | 101 KB | 25 KB (25%) | ✓ | 3rd |
| https://consent.cookiebot.com/uc.js | 27 KB | — | ✓ | 3rd |
| https://static.labiennale.org/files/js/js_siAzsLQXar6_8hnne92BaBQNphQqqLqTxKnhobUkxPk.js | 39 KB | — | ✗ | 3rd |
| https://static.labiennale.org/files/js/js_gTd4U5Ixr7jD6Iy1a-AnwhsWJMyfk9VI4tcTJaYAt8E.js | 13 KB | — | ✗ | 3rd |
| https://static.labiennale.org/files/js/js_t14MH5HMpIPvofj11pf8xgDNdp6s_8vYGQ7h2fsHpiY.js | 11 KB | — | ✗ | 3rd |
| https://static.labiennale.org/files/js/js_oYVKp-cluFZQnjxYMtXDmhZY3bwT8PYHYk6oiRMAQDw.js | 2 KB | — | ✓ | 3rd |
| https://static.labiennale.org/files/js/js_koKqZylAHdvmXNtCfSAUlrok3mcbuKixJGQlDEbHwoI.js | 1 KB | — | ✓ | 3rd |
| https://static.labiennale.org/files/js/js_L50O_PWoAuMOxVjnzZCkNSSmI0kFwhZsO1_KS8WnGKw.js | 2 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
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 Loading7 fonts (99 KB)PASS
Web fonts
7
99 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~2 KB and ~4 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints1 hints, 0 missing preconnectsPASS
Current Resource Hints
1 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall79 requests over 2144msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.labiennale.org www.labiennale.org | Other | 1248ms | 15 KB | — | €14/mo | Costly |
static.labiennale.org static.labiennale.org | Other | 1155ms | 39 KB | — | €13/mo | Costly |
Unattributable Unattributable | Other | 420ms | 0 KB | — | €5/mo | Costly |
consent.cookiebot.com consent.cookiebot.com | Other | 278ms | 101 KB | 25% | €3/mo | Costly |
static.labiennale.org static.labiennale.org | Other | 232ms | 143 KB | 63% | €3/mo | Costly |
consent.cookiebot.com consent.cookiebot.com | Other | 180ms | 27 KB | — | €2/mo | Optional |
These scripts may cost more than they're worth
- www.labiennale.org adds 1248ms and costs ~€14/month
- static.labiennale.org adds 1155ms and costs ~€13/month
- Unattributable adds 420ms and costs ~€5/month
- consent.cookiebot.com adds 278ms and costs ~€3/month
- static.labiennale.org adds 232ms 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.labiennale.org takes 1248ms 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
static.labiennale.org takes 1155ms 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 420ms 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
consent.cookiebot.com takes 278ms 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
static.labiennale.org takes 232ms 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
63% of static.labiennale.org'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