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
Image Optimization
Action
17 images, 0 KB saveable
REVIEW
17 images, 0 KB saveable
Warning::
!
https://sp-ao.shortpixel.ai/client/to_auto,q_gloss... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://sp-ao.shortpixel.ai/client/to_auto,q_gloss... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
17images2.3 MB
0oversized-0 KB
15legacy format
2missing dimensionsCLS risk
Set explicit width and height to prevent CLS.
Why this matters
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.
Why this matters
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
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
Asset Compression
Action
1 of 2 asset hosts serve text uncompressed
REVIEW
1 of 2 asset hosts serve text uncompressed
Info::
i
www.romewebagency.it serves assets with gzip; brotli would be ~20% smaller (assets: 17)
Every current browser accepts brotli. On a CDN this is a per-pull-zone toggle (Cloudflare, Fastly, CloudFront, CDN77, Bunny all expose it); on an origin it needs the brotli module (nginx-brotli, Apache mod_brotli). The saving lands on the assets this host serves, not on the HTML document -- the document's own encoding is reported separately.
Got: www.romewebagency.it (text/css)
Warning::
!
fonts.googleapis.com serves text assets uncompressed (assets: 4)
The sampled response carries a text content type but no Content-Encoding, so the bytes go over the wire raw. Text compression typically removes 70-80% of a JS or CSS payload -- this is the single cheapest transfer win available on this host.
Got: fonts.googleapis.com (text/css)
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+
JS Execution Cost
269ms total JS execution
PASS
269ms total JS execution
Info::
i
https://www.romewebagency.it/: 215ms CPU time
Info::
i
Unattributable: 54ms CPU time
Warning::
!
Third-party scripts: 215ms (80% of total)
Main Thread Breakdown
Other 48% Style & Layout 31% Parse HTML & CSS 10% Script Evaluation 6% Rendering 5%
Script
Total
Scripting
Parse/Compile
Party
https://www.romewebagency.it/
215ms
7ms
3ms
3rd
Unattributable
54ms
1ms
0ms
1st
A+
Font Loading
9 fonts (328 KB)
PASS
9 fonts (328 KB)
Info::
i
9 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
9
328 KB total
Render-blocking
0
of 9
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
thegem-icons.woffwoffswap
Size12 KB
Load time82 ms
Start598 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
6xK3dSBYKcSV-LCoeQqfX1R...woff2swap
Size14 KB
Load time70 ms
Start598 ms
RiskFOUT — text flashes from fallback to web font
JTUSjIg1_i6t8kCHKm459Wl...woff2swap
Size35 KB
Load time89 ms
Start598 ms
RiskFOUT — text flashes from fallback to web font
fontawesome-webfont.woffwoffswap
Size82 KB
Load time72 ms
Start599 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
montserrat-ultralight.woffwoffswap
Size53 KB
Load time72 ms
Start599 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
6xKydSBYKcSV-LCoeQqfX1R...woff2swap
Size14 KB
Load time87 ms
Start599 ms
RiskFOUT — text flashes from fallback to web font
wEOzEBbCkc5cO0ejVSkPU9I...woff2swap
Size13 KB
Load time79 ms
Start599 ms
RiskFOUT — text flashes from fallback to web font
materialdesignicons.woffwoffswap
Size86 KB
Load time84 ms
Start599 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
thegem-socials.woffwoffswap
Size19 KB
Load time82 ms
Start600 ms
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 ~76 KB and ~152 ms
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
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+
Document Compression
Document response uses brotli
PASS
Document response uses brotli
Info::
✓
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
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
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
✓
`Vary` header declared: Accept-Encoding,Cookie
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Hetzner Online GmbH
Network Waterfall
46 requests over 1363ms
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-party215ms · 25KB · €1/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.romewebagency.it
www.romewebagency.it
Other
215ms
25 KB
—
€1/mo
Costly
www.romewebagency.it
Other
Costly
Execution215ms
Transfer25 KB
Monthly Cost€1/mo
These scripts may cost more than they're worth
www.romewebagency.it adds 215ms and costs ~€1/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
www.romewebagency.it takes 215ms 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.