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
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
7 fonts (215 KB)
PASS
7 fonts (215 KB)
Info::
i
7 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
7
215 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
dm-sans-v6-latin-ext_la...woff2swap
Size23 KB
Load time10 ms
Start516 ms
RiskFOUT — text flashes from fallback to web font
conad-corporate-icons.ttfttfswap
Size64 KB
Load time20 ms
Start517 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
dm-sans-v6-latin-ext_la...woff2swap
Size23 KB
Load time7 ms
Start517 ms
RiskFOUT — text flashes from fallback to web font
dm-sans-v6-latin-ext_la...woff2swap
Size23 KB
Load time14 ms
Start517 ms
RiskFOUT — text flashes from fallback to web font
roboto-slab-v13-latin-e...woff2swap
Size23 KB
Load time14 ms
Start517 ms
RiskFOUT — text flashes from fallback to web font
dm-sans-v6-latin-ext_la...woff2swap
Size24 KB
Load time15 ms
Start518 ms
RiskFOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size34 KB
Load time466 ms
Start1.7 s
RiskFOUT — text flashes from fallback to web font
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 ~19 KB and ~38 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+
Main HTML Cache-Control
Main HTML max-age=300 (≤ 5min) is appropriate
PASS
Main HTML max-age=300 (≤ 5min) is appropriate
Info::
✓
Main HTML max-age=300 (≤ 5min) is appropriate
Got: max-age=300
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.
A
HTTP Caching
max-age=300 (5 minutes)
PASS
max-age=300 (5 minutes)
Info::
✓
Cache-Control header is set
Got: max-age=300
Info::
✓
Effective TTL: 5 minutes (max-age=300)
Info::
i
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
max-age=300
Directive
Value
Meaning
max-age
300
Cache for 5 minutes
Effective TTL: 300 seconds
Network Waterfall
86 requests over 4873ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
85%of JavaScript execution is third-party
First-party Third-party1397ms · 802KB · €7/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.conad.it
www.conad.it
Other
291ms
174 KB
75%
€2/mo
Costly
www.conad.it
www.conad.it
Other
261ms
38 KB
64%
€1/mo
Costly
www.gstatic.com
www.gstatic.com
Other
247ms
0 KB
50%
€1/mo
Costly
www.conad.it
www.conad.it
Other
159ms
43 KB
—
€1/mo
Optional
acsbapp.com
acsbapp.com
Other
129ms
227 KB
52%
€1/mo
Optional
assets.adobedtm.com
assets.adobedtm.com
Other
97ms
110 KB
35%
€1/mo
Optional
www.conad.it
www.conad.it
Other
77ms
7 KB
—
€0/mo
Optional
OneTrust
cdn.cookielaw.org
Consent
71ms
119 KB
52%
€0/mo
Essential
maps.googleapis.com
maps.googleapis.com
Other
64ms
83 KB
63%
€0/mo
Optional
www.conad.it
Other
Costly
Execution291ms
Transfer174 KB
Unused75%
Monthly Cost€2/mo
www.conad.it
Other
Costly
Execution261ms
Transfer38 KB
Unused64%
Monthly Cost€1/mo
www.gstatic.com
Other
Costly
Execution247ms
Transfer0 KB
Unused50%
Monthly Cost€1/mo
www.conad.it
Other
Optional
Execution159ms
Transfer43 KB
Monthly Cost€1/mo
acsbapp.com
Other
Optional
Execution129ms
Transfer227 KB
Unused52%
Monthly Cost€1/mo
assets.adobedtm.com
Other
Optional
Execution97ms
Transfer110 KB
Unused35%
Monthly Cost€1/mo
www.conad.it
Other
Optional
Execution77ms
Transfer7 KB
Monthly Cost€0/mo
OneTrust
Consent
Essential
Execution71ms
Transfer119 KB
Unused52%
Monthly Cost€0/mo
maps.googleapis.com
Other
Optional
Execution64ms
Transfer83 KB
Unused63%
Monthly Cost€0/mo
These scripts may cost more than they're worth
www.conad.it adds 291ms and costs ~€2/month
www.conad.it adds 261ms and costs ~€1/month
www.gstatic.com adds 247ms and costs ~€1/month
85% 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.conad.it takes 291ms 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.
Source: web.dev
75% of www.conad.it's code is unused. The script may be loading features you don't use.
Why this matters
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
www.conad.it takes 261ms 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.
Source: web.dev
64% of www.conad.it's code is unused. The script may be loading features you don't use.
Why this matters
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
www.gstatic.com takes 247ms 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.
Source: web.dev
52% of acsbapp.com's code is unused. The script may be loading features you don't use.
Why this matters
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
52% of OneTrust's code is unused. The script may be loading features you don't use.
Why this matters
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
63% of maps.googleapis.com's code is unused. The script may be loading features you don't use.
Why this matters
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.