Performance
· 26 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.
4.96 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
26.30 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.97 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
13.00 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.
39.09 s
Page Load Progression
FPage Weight BudgetAction8.7 MB transferred, 199 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
FJS Execution CostAction11224ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.treccani.it/_next/static/chunks/framework-663aa04c6d4d8976.js | 2739ms | 1985ms | 20ms | 3rd |
| https://www.treccani.it/ | 2243ms | 9ms | 2ms | 3rd |
| Unattributable | 1456ms | 227ms | 0ms | 1st |
| https://www.gstatic.com/recaptcha/releases/A7KpaEASfhDcK0nXxgQEyyYv/recaptcha__en.js | 961ms | 830ms | 101ms | 3rd |
| https://clickiocmp.com/t/consent_235255.js | 818ms | 551ms | 28ms | 3rd |
| https://www.treccani.it/_next/static/chunks/pages/_app-26a6bbcd95631f26.js | 624ms | 399ms | 97ms | 3rd |
| https://s.adplay.it/treccani/adplay.js | 539ms | 371ms | 150ms | 3rd |
| https://client.aps.amazon-adsystem.com/publisher.js | 410ms | 349ms | 45ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-HWHNGNTMSL&cx=c>m=4e67m1h2 | 334ms | 286ms | 44ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202607210101/pubads_impl.js | 282ms | 212ms | 63ms | 3rd |
Showing top 10 of 16 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 | 272 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/m202607210101/pubads_impl.js | 197 KB | 149 KB (76%) | ✓ | 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 | 63 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MNG6HS2 | 139 KB | 61 KB (44%) | ✓ | 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 InventoryAction199 resources · 8.7 MB · 1.3 MB savings availableFIX
~1.3 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 199 resources | 8.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction88 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
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
BJavaScript Blocking2 JS blocking issue(s) detectedREVIEW
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 Hints9 hints, 0 missing preconnectsPASS
Current Resource Hints
9 resource hints configured
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server Response Intelligence1 server-response signal(s) detectedPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
ACSS Performance Depth1 CSS depth issue(s) detectedPASS
Network Waterfall199 requests over 4775msINFO
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 | 2739ms | 45 KB | — | €30/mo | Costly |
www.treccani.it www.treccani.it | Other | 2243ms | 215 KB | — | €24/mo | Costly |
www.gstatic.com www.gstatic.com | Other | 961ms | 0 KB | 48% | €10/mo | Costly |
clickiocmp.com clickiocmp.com | Other | 818ms | 90 KB | 36% | €9/mo | Costly |
www.treccani.it www.treccani.it | Other | 624ms | 252 KB | 50% | €7/mo | Costly |
s.adplay.it s.adplay.it | Other | 539ms | 379 KB | 72% | €6/mo | Costly |
client.aps.amazon-adsystem.com client.aps.amazon-adsystem.com | Other | 410ms | 93 KB | 60% | €4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 334ms | 167 KB | 38% | €4/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 282ms | 197 KB | 76% | €3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 226ms | 139 KB | 44% | €2/mo | Costly |
www.treccani.it www.treccani.it | Other | 184ms | 2 KB | — | €2/mo | Optional |
www.treccani.it www.treccani.it | Other | 157ms | 39 KB | — | €2/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 129ms | 37 KB | — | €1/mo | Optional |
secure.cdn.fastclick.net secure.cdn.fastclick.net | Other | 72ms | 22 KB | — | €1/mo | Optional |
config.aps.amazon-adsystem.com config.aps.amazon-adsystem.com | Other | 50ms | 3 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.treccani.it adds 2739ms and costs ~€30/month
- www.treccani.it adds 2243ms and costs ~€24/month
- www.gstatic.com adds 961ms and costs ~€10/month
- clickiocmp.com adds 818ms and costs ~€9/month
- www.treccani.it adds 624ms and costs ~€7/month
- s.adplay.it adds 539ms and costs ~€6/month
- client.aps.amazon-adsystem.com adds 410ms and costs ~€4/month
- Google Tag Manager adds 334ms and costs ~€4/month
- securepubads.g.doubleclick.net adds 282ms and costs ~€3/month
- Google Tag Manager adds 226ms and costs ~€2/month
87% 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 2739ms 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 2243ms 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 961ms 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
clickiocmp.com 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.treccani.it takes 624ms 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
s.adplay.it takes 539ms 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
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
client.aps.amazon-adsystem.com takes 410ms 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 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
Google Tag Manager takes 334ms 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
securepubads.g.doubleclick.net takes 282ms 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
76% 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
Google Tag Manager takes 226ms 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
Image Optimization66 images, 10 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
66
Total Size
10 KB
Oversized
2