Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
C
Page Weight Budget
Action
1.6 MB transferred, 89 requests
REVIEW
1.6 MB transferred, 89 requests
Info::
i
Page weighs 5.2 MB (1.6 MB transferred)
Warning::
!
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
i
89 HTTP requests
Info::
i
Estimated 0.33 g CO2 per page load
1.6 MBtransferred
89 requests
0.33 g CO2 per page load
JavaScript1.1 MiB72%
Images174.2 KiB11%
Other162.2 KiB10%
CSS46.6 KiB3%
HTML41.6 KiB3%
Other28.9 KiB2%
Other2.6 KiB0%
Other0 B0%
02.4 MB4.9 MB
Approaching limit
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Why this matters
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
B
Image Optimization
44 images, 0 KB saveable
REVIEW
44 images, 0 KB saveable
Info::
✓
All images are well-optimized
44images174 KB
0oversized-0 KB
6legacy format
0missing dimensionsCLS risk
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.
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
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
✓
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
✓
Page uses 4 resource hint(s)
Current Resource Hints
preconnect
1
preload
3
dns-prefetch—
prefetch—
4 resource hints configured
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.
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
✓
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
!
1 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
✓
No CSS performance depth issues detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Aruba.it
Network Waterfall
89 requests over 2917ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
80%of JavaScript execution is third-party
First-party Third-party2770ms · 953KB · €30/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
clickiocmp.com
clickiocmp.com
Other
784ms
91 KB
36%
€9/mo
Costly
s.adplay.it
s.adplay.it
Other
512ms
397 KB
70%
€6/mo
Costly
www.medicitalia.it
www.medicitalia.it
Other
460ms
34 KB
—
€5/mo
Costly
client.aps.amazon-adsystem.com
client.aps.amazon-adsystem.com
Other
381ms
84 KB
59%
€4/mo
Costly
securepubads.g.doubleclick.net
securepubads.g.doubleclick.net
Other
236ms
199 KB
76%
€3/mo
Costly
news.google.com
news.google.com
Other
140ms
80 KB
52%
€2/mo
Optional
securepubads.g.doubleclick.net
securepubads.g.doubleclick.net
Other
103ms
37 KB
—
€1/mo
Optional
codicebusiness.shinystat.com
codicebusiness.shinystat.com
Other
82ms
10 KB
—
€1/mo
Optional
secure.cdn.fastclick.net
secure.cdn.fastclick.net
Other
73ms
22 KB
—
€1/mo
Optional
clickiocmp.com
Other
Costly
Execution784ms
Transfer91 KB
Unused36%
Monthly Cost€9/mo
s.adplay.it
Other
Costly
Execution512ms
Transfer397 KB
Unused70%
Monthly Cost€6/mo
www.medicitalia.it
Other
Costly
Execution460ms
Transfer34 KB
Monthly Cost€5/mo
client.aps.amazon-adsystem.com
Other
Costly
Execution381ms
Transfer84 KB
Unused59%
Monthly Cost€4/mo
securepubads.g.doubleclick.net
Other
Costly
Execution236ms
Transfer199 KB
Unused76%
Monthly Cost€3/mo
news.google.com
Other
Optional
Execution140ms
Transfer80 KB
Unused52%
Monthly Cost€2/mo
securepubads.g.doubleclick.net
Other
Optional
Execution103ms
Transfer37 KB
Monthly Cost€1/mo
codicebusiness.shinystat.com
Other
Optional
Execution82ms
Transfer10 KB
Monthly Cost€1/mo
secure.cdn.fastclick.net
Other
Optional
Execution73ms
Transfer22 KB
Monthly Cost€1/mo
These scripts may cost more than they're worth
clickiocmp.com adds 784ms and costs ~€9/month
s.adplay.it adds 512ms and costs ~€6/month
www.medicitalia.it adds 460ms and costs ~€5/month
client.aps.amazon-adsystem.com adds 381ms and costs ~€4/month
securepubads.g.doubleclick.net adds 236ms and costs ~€3/month
80% 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
clickiocmp.com takes 784ms 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
s.adplay.it takes 512ms 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
70% of s.adplay.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.medicitalia.it takes 460ms 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
client.aps.amazon-adsystem.com takes 381ms 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
59% of client.aps.amazon-adsystem.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
securepubads.g.doubleclick.net takes 236ms 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
76% of securepubads.g.doubleclick.net'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 news.google.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.