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
7 fonts (235 KB)
PASS
7 fonts (235 KB)
Info::
i
7 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
7
235 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
TK3_WkUHHAIjg75cFRf3bXL...woff2swap
Size12 KB
Load time43 ms
Start730 ms
RiskFOUT — text flashes from fallback to web font
ProximaNova-Regular.otfotfswap
Size56 KB
Load time128 ms
Start730 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
TK3iWkUHHAIjg752GT8Gl-1...woff2swap
Size28 KB
Load time60 ms
Start731 ms
RiskFOUT — text flashes from fallback to web font
fontawesome-webfont.woff2woff2swap
Size76 KB
Load time105 ms
Start731 ms
RiskFOUT — text flashes from fallback to web font
ProximaNovaThin.otfotfswap
Size54 KB
Load time108 ms
Start732 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
slick.woffwoffswap
Size2 KB
Load time68 ms
Start733 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
revicons.woffwoffswap
Size8 KB
Load time35 ms
Start1.1 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 ~36 KB and ~72 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.
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall
54 requests over 2822ms
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-party1126ms · 859KB · €18/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.swappz.com
www.swappz.com
Other
383ms
241 KB
—
€6/mo
Costly
tcms.psmcdn.net
tcms.psmcdn.net
Other
367ms
297 KB
65%
€6/mo
Costly
www.swappz.com
www.swappz.com
Other
109ms
0 KB
—
€2/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
105ms
163 KB
40%
€2/mo
Optional
Microsoft Clarity
scripts.clarity.ms
Session Replay
85ms
25 KB
—
€1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
77ms
133 KB
47%
€1/mo
Optional
www.swappz.com
Other
Costly
Execution383ms
Transfer241 KB
Monthly Cost€6/mo
tcms.psmcdn.net
Other
Costly
Execution367ms
Transfer297 KB
Unused65%
Monthly Cost€6/mo
www.swappz.com
Other
Optional
Execution109ms
Transfer0 KB
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution105ms
Transfer163 KB
Unused40%
Monthly Cost€2/mo
Microsoft Clarity
Session Replay
Optional
Execution85ms
Transfer25 KB
Monthly Cost€1/mo
Google Tag Manager
Tag Manager
Optional
Execution77ms
Transfer133 KB
Unused47%
Monthly Cost€1/mo
These scripts may cost more than they're worth
www.swappz.com adds 383ms and costs ~€6/month
tcms.psmcdn.net adds 367ms and costs ~€6/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.swappz.com takes 383ms 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
tcms.psmcdn.net takes 367ms 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
65% of tcms.psmcdn.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.