Consider code splitting or tree shaking to reduce unused code.
Why this matters
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.
Why this matters
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.
Why this matters
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.
Why this matters
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
i
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
i
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
i
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
i
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW
Green Hosting
No green hosting detected
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
✓
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
15 fonts (897 KB)
PASS
15 fonts (897 KB)
Info::
i
15 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
15
897 KB total
Render-blocking
0
of 15
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
Poppins-ExtraLight.ttfttfswap
Size66 KB
Load time80 ms
Start525 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Poppins-Light.ttfttfswap
Size66 KB
Load time86 ms
Start525 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Poppins-Bold.ttfttfswap
Size65 KB
Load time87 ms
Start526 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Poppins-Regular.ttfttfswap
Size66 KB
Load time95 ms
Start526 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Flaticon.woffwoffswap
Size9 KB
Load time89 ms
Start527 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Poppins-Medium.ttfttfswap
Size66 KB
Load time97 ms
Start527 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Poppins-SemiBold.ttfttfswap
Size65 KB
Load time102 ms
Start527 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Poppins-BoldItalic.ttfttfswap
Size75 KB
Load time119 ms
Start528 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Poppins-Regular.ttfttfswap
Size66 KB
Load time76 ms
Start573 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Poppins-Bold.ttfttfswap
Size65 KB
Load time78 ms
Start574 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Poppins-Light.ttfttfswap
Size66 KB
Load time81 ms
Start574 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Poppins-ExtraLight.ttfttfswap
Size66 KB
Load time81 ms
Start574 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Poppins-Medium.ttfttfswap
Size66 KB
Load time82 ms
Start575 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Poppins-SemiBold.ttfttfswap
Size65 KB
Load time82 ms
Start575 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
roobertenel-regular-web...woffswap
Size28 KB
Load time41 ms
Start1.6 s
RiskFOUT — text flashes from fallback to web font
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 ~269 KB and ~538 ms
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
✓
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
✓
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
✓
No resource hint issues
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
✓
LCP image preload audit not available for this scan
A+
Server Response Intelligence
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
Info::
i
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
Network Waterfall
81 requests over 3423ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
87%of JavaScript execution is third-party
First-party Third-party802ms · 112KB · €9/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.servizioelettriconazionale.it
www.servizioelettriconazionale.it
Other
488ms
30 KB
—
€5/mo
Costly
www.servizioelettriconazionale.it
www.servizioelettriconazionale.it
Other
181ms
0 KB
—
€2/mo
Optional
www.servizioelettriconazionale.it
www.servizioelettriconazionale.it
Other
133ms
82 KB
42%
€1/mo
Optional
www.servizioelettriconazionale.it
Other
Costly
Execution488ms
Transfer30 KB
Monthly Cost€5/mo
www.servizioelettriconazionale.it
Other
Optional
Execution181ms
Transfer0 KB
Monthly Cost€2/mo
www.servizioelettriconazionale.it
Other
Optional
Execution133ms
Transfer82 KB
Unused42%
Monthly Cost€1/mo
These scripts may cost more than they're worth
www.servizioelettriconazionale.it adds 488ms and costs ~€5/month
87% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
Why this matters
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.servizioelettriconazionale.it takes 488ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
Why this matters
This script has high main-thread execution time — optimize hot paths or defer.