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.
611 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.37 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 ms
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.
725 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
1.37 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BJS Bundles21 scripts, 67 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-B6DW0JNSVQ | 159 KB | 67 KB (42%) | ✓ | 3rd |
| https://www.roccosiffredifilms.com/_next/static/chunks/webpack-ca3c89e4067f54c6.js | 3 KB | — | ✓ | 3rd |
| https://www.roccosiffredifilms.com/_next/static/chunks/4bd1b696-21f374d1156f834a.js | 55 KB | — | ✓ | 3rd |
| https://www.roccosiffredifilms.com/_next/static/chunks/255-09eddc9d5ad190e7.js | 45 KB | — | ✓ | 3rd |
| https://www.roccosiffredifilms.com/_next/static/chunks/main-app-5b9be70a80a88730.js | 1 KB | — | ✓ | 3rd |
| https://www.roccosiffredifilms.com/_next/static/chunks/20-0082a47cf797de37.js | 19 KB | — | ✓ | 3rd |
| https://www.roccosiffredifilms.com/_next/static/chunks/app/global-error-6dddef79086a774b.js | 8 KB | — | ✓ | 3rd |
| https://www.roccosiffredifilms.com/_next/static/chunks/252-a3be2262a0215496.js | 7 KB | — | ✓ | 3rd |
| https://www.roccosiffredifilms.com/_next/static/chunks/577-2d6b70331a27521e.js | 7 KB | — | ✓ | 3rd |
| https://www.roccosiffredifilms.com/_next/static/chunks/app/%5Blocale%5D/layout-0ebd3b8c54a6035d.js | 4 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
CCompression AlgorithmActionMain response served uncompressedREVIEW
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
APage Weight Budget898 KB transferred, 72 requestsPASS
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization23 images, 0 KB saveablePASS
A+JS Execution Cost379ms total JS executionPASS
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.roccosiffredifilms.com/_next/static/chunks/255-09eddc9d5ad190e7.js | 118ms | 108ms | 3ms | 3rd |
| Unattributable | 104ms | 16ms | 0ms | 1st |
| https://www.roccosiffredifilms.com/ | 100ms | 6ms | 11ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-B6DW0JNSVQ | 58ms | 48ms | 10ms | 3rd |
A+Font Loading1 fonts (48 KB)PASS
Web fonts
1
48 KB total
Render-blocking
0
of 1
Dominant font-display
swap
Most common across fonts
Font loading timeline
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)
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server-Timing Observability3 Server-Timing entries advertisedPASS
A+Server Response Intelligence1 server-response signal(s) detectedPASS
APage Weight Inventory72 resources · 898 KB · 67 KB savings availablePASS
~67.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 72 resources | 897.7 KiB | ||||||
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall72 requests over 1488msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.roccosiffredifilms.com www.roccosiffredifilms.com | Other | 118ms | 45 KB | — | €2/mo | Optional |
www.roccosiffredifilms.com www.roccosiffredifilms.com | Other | 100ms | 30 KB | — | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 58ms | 159 KB | 42% | €1/mo | Optional |
73% 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
Image Optimization53 images, 18 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
53
Total Size
18 KB