Performance
· 23 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.
1.34 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.21 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
196 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.519
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.93 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.
4.49 s
Page Load Progression
FPage Weight BudgetAction5.7 MB transferred, 120 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
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
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 CostAction2320ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 431ms | 93ms | 0ms | 1st |
| https://www.cdp.it/sitointernet/it/homepage.page | 339ms | 18ms | 9ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202401.2.0/otBannerSdk.js | 264ms | 146ms | 50ms | 3rd |
| https://www.cdp.it/18f5227b-e27b-445a-a53f-f845fbe69b40/stormcaster.js | 239ms | 174ms | 18ms | 3rd |
| https://www.cdp.it/internet/public/bundles/cdp-internet-common-bundle-7afb108b/resources/js/jquery.min.js | 237ms | 130ms | 4ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-9383310&cx=c>m=4e67t1 | 148ms | 127ms | 18ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-736416139 | 139ms | 118ms | 19ms | 3rd |
| https://acsbapp.com/apps/app/dist/js/app.js | 137ms | 99ms | 34ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TPKZ3DX | 132ms | 107ms | 23ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-R8P7CTK1R3&cx=c>m=4e67t1 | 94ms | 71ms | 22ms | 3rd |
Showing top 10 of 12 scripts
FJS BundlesAction31 scripts, 719 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://acsbapp.com/apps/app/dist/js/app.js | 227 KB | 128 KB (58%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-10349980&cx=c>m=4e67t1 | 134 KB | 101 KB (75%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-R8P7CTK1R3&cx=c>m=4e67t1 | 183 KB | 73 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TPKZ3DX | 172 KB | 68 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-9383310&cx=c>m=4e67t1 | 137 KB | 67 KB (49%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-1234567&cx=c>m=4e67t1 | 145 KB | 65 KB (45%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-10349980 | 134 KB | 63 KB (47%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-736416139 | 144 KB | 55 KB (38%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202401.2.0/otBannerSdk.js | 104 KB | 54 KB (52%) | ✓ | 3rd |
| https://www.cdp.it/18f5227b-e27b-445a-a53f-f845fbe69b40/stormcaster.js | 152 KB | 45 KB (30%) | ✓ | 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 InventoryAction120 resources · 5.7 MB · 719 KB savings availableFIX
~718.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 120 resources | 5.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction33 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
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
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 Loading3 fonts (302 KB)PASS
Web fonts
3
302 KB total
Render-blocking
0
of 3
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
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 ~219 KB and ~438 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 Waterfall120 requests over 4464msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.cdp.it www.cdp.it | Other | 339ms | 38 KB | — | €4/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 264ms | 104 KB | 52% | €3/mo | Essential |
www.cdp.it www.cdp.it | Other | 239ms | 152 KB | 30% | €3/mo | Costly |
www.cdp.it www.cdp.it | Other | 237ms | 34 KB | — | €3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 148ms | 137 KB | 49% | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 139ms | 144 KB | 38% | €2/mo | Optional |
acsbapp.com acsbapp.com | Other | 137ms | 227 KB | 58% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 132ms | 172 KB | 40% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 94ms | 183 KB | 40% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 84ms | 134 KB | 47% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 77ms | 145 KB | 45% | €1/mo | Optional |
These scripts may cost more than they're worth
- www.cdp.it adds 339ms and costs ~€4/month
- www.cdp.it adds 239ms and costs ~€3/month
- www.cdp.it adds 237ms and costs ~€3/month
81% 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.cdp.it takes 339ms 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
52% of OneTrust'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.cdp.it takes 239ms 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.cdp.it takes 237ms 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
58% of acsbapp.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
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-07-02 — 2026-07-29)
LCP (p75)
3019 ms
64% good
INP (p75)
179 ms
79% good
CLS (p75)
0.090
88% good
FCP (p75)
1612 ms
TTFB (p75)
817 ms
Image Optimization1 images, 0 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
1
Total Size
0 KB
Oversized
1