Performance
· 22 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.
1.29 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.11 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
340 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.003
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.82 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.
6.94 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 sFPage Weight BudgetAction8.6 MB transferred, 204 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
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 CostAction2640ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.treccani.it/_next/static/chunks/framework-663aa04c6d4d8976.js | 780ms | 567ms | 3ms | 3rd |
| https://www.treccani.it/ | 490ms | 4ms | 1ms | 3rd |
| Unattributable | 375ms | 83ms | 0ms | 1st |
| https://www.gstatic.com/recaptcha/releases/A7KpaEASfhDcK0nXxgQEyyYv/recaptcha__en.js | 211ms | 178ms | 27ms | 3rd |
| https://clickiocmp.com/t/consent_235255.js | 181ms | 136ms | 7ms | 3rd |
| https://www.treccani.it/_next/static/chunks/pages/_app-26a6bbcd95631f26.js | 156ms | 102ms | 20ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-HWHNGNTMSL&cx=c>m=4e67m1h2 | 109ms | 91ms | 16ms | 3rd |
| https://s.adplay.it/treccani/adplay.js | 105ms | 70ms | 32ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202607160101/pubads_impl.js?cb=31099817 | 89ms | 58ms | 17ms | 3rd |
| https://client.aps.amazon-adsystem.com/publisher.js | 85ms | 71ms | 12ms | 3rd |
Showing top 10 of 11 scripts
FJS BundlesAction63 scripts, 1.3 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://s.adplay.it/treccani/adplay.js | 379 KB | 273 KB (72%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/A7KpaEASfhDcK0nXxgQEyyYv/recaptcha__en.js | 0 KB | 180 KB (48%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/A7KpaEASfhDcK0nXxgQEyyYv/recaptcha__en.js | 373 KB | 180 KB (48%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/A7KpaEASfhDcK0nXxgQEyyYv/recaptcha__en.js | 374 KB | 180 KB (48%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202607160101/pubads_impl.js?cb=31099817 | 196 KB | 147 KB (75%) | ✓ | 3rd |
| https://www.treccani.it/_next/static/chunks/pages/_app-26a6bbcd95631f26.js | 252 KB | 127 KB (50%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-HWHNGNTMSL&cx=c>m=4e67m1h2 | 167 KB | 62 KB (37%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MNG6HS2 | 139 KB | 60 KB (43%) | ✓ | 3rd |
| https://client.aps.amazon-adsystem.com/publisher.js | 93 KB | 55 KB (60%) | ✓ | 3rd |
| https://clickiocmp.com/t/consent_235255.js | 90 KB | 33 KB (36%) | ✓ | 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 InventoryAction204 resources · 8.6 MB · 1.3 MB savings availableFIX
~1.3 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 204 resources | 8.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization93 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
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
CCompression AlgorithmActionMain response served uncompressedREVIEW
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
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 (1154 KB)PASS
Web fonts
9
1154 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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 ~896 KB and ~1792 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server Response Intelligence1 server-response signal(s) detectedPASS
Network Waterfall204 requests over 2772msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.treccani.it www.treccani.it | Other | 780ms | 45 KB | — | €8/mo | Costly |
www.treccani.it www.treccani.it | Other | 490ms | 64 KB | — | €5/mo | Costly |
www.gstatic.com www.gstatic.com | Other | 211ms | 0 KB | 48% | €2/mo | Costly |
clickiocmp.com clickiocmp.com | Other | 181ms | 90 KB | 36% | €2/mo | Optional |
www.treccani.it www.treccani.it | Other | 156ms | 252 KB | 50% | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 109ms | 167 KB | 37% | €1/mo | Optional |
s.adplay.it s.adplay.it | Other | 105ms | 379 KB | 72% | €1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 89ms | 196 KB | 75% | €1/mo | Optional |
client.aps.amazon-adsystem.com client.aps.amazon-adsystem.com | Other | 85ms | 93 KB | 60% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 58ms | 139 KB | 43% | €1/mo | Optional |
These scripts may cost more than they're worth
- www.treccani.it adds 780ms and costs ~€8/month
- www.treccani.it adds 490ms and costs ~€5/month
- www.gstatic.com adds 211ms and costs ~€2/month
86% 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.treccani.it takes 780ms 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.treccani.it takes 490ms 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.gstatic.com takes 211ms 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
50% of www.treccani.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
72% of s.adplay.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
75% of securepubads.g.doubleclick.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
60% of client.aps.amazon-adsystem.com'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
Image Optimization66 images, 10 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
66
Total Size
10 KB
Oversized
2