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
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Warning::
!
https://images.psmcdn.net/tsv4/networks/swpz.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://images.psmcdn.net/assets/ts/img/rta/120/d.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
27images3.7 MB
0oversized-0 KB
25legacy 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
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 time38 ms
Start747 ms
RiskFOUT — text flashes from fallback to web font
TK3iWkUHHAIjg752GT8Gl-1...woff2swap
Size28 KB
Load time59 ms
Start748 ms
RiskFOUT — text flashes from fallback to web font
fontawesome-webfont.woff2woff2swap
Size76 KB
Load time115 ms
Start748 ms
RiskFOUT — text flashes from fallback to web font
ProximaNova-Regular.otfotfswap
Size56 KB
Load time119 ms
Start749 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
ProximaNovaThin.otfotfswap
Size54 KB
Load time137 ms
Start749 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
slick.woffwoffswap
Size2 KB
Load time136 ms
Start749 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
revicons.woffwoffswap
Size8 KB
Load time38 ms
Start893 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 ~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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
✓
Page uses 2 resource hint(s)
Current Resource Hints
preconnect
2
preload—
dns-prefetch—
prefetch—
2 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::
!
Total JS execution time is 6.3 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
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: Cloudflare
Network Waterfall
59 requests over 2721ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
88%of JavaScript execution is third-party
First-party Third-party5523ms · 989KB · €88/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.swappz.com
www.swappz.com
Other
2340ms
241 KB
—
€37/mo
Costly
tcms.psmcdn.net
tcms.psmcdn.net
Other
1657ms
297 KB
64%
€26/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
416ms
163 KB
41%
€7/mo
Costly
www.swappz.com
www.swappz.com
Other
399ms
0 KB
—
€6/mo
Costly
Microsoft Clarity
scripts.clarity.ms
Session Replay
250ms
25 KB
—
€4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
240ms
133 KB
47%
€4/mo
Costly
hrsvzn.psmcode.com
hrsvzn.psmcode.com
Other
163ms
57 KB
52%
€3/mo
Optional
tcms.psmcdn.net
tcms.psmcdn.net
Other
58ms
72 KB
—
€1/mo
Optional
www.swappz.com
Other
Costly
Execution2340ms
Transfer241 KB
Monthly Cost€37/mo
tcms.psmcdn.net
Other
Costly
Execution1657ms
Transfer297 KB
Unused64%
Monthly Cost€26/mo
Google Tag Manager
Tag Manager
Costly
Execution416ms
Transfer163 KB
Unused41%
Monthly Cost€7/mo
www.swappz.com
Other
Costly
Execution399ms
Transfer0 KB
Monthly Cost€6/mo
Microsoft Clarity
Session Replay
Costly
Execution250ms
Transfer25 KB
Monthly Cost€4/mo
Google Tag Manager
Tag Manager
Costly
Execution240ms
Transfer133 KB
Unused47%
Monthly Cost€4/mo
hrsvzn.psmcode.com
Other
Optional
Execution163ms
Transfer57 KB
Unused52%
Monthly Cost€3/mo
tcms.psmcdn.net
Other
Optional
Execution58ms
Transfer72 KB
Monthly Cost€1/mo
These scripts may cost more than they're worth
www.swappz.com adds 2340ms and costs ~€37/month
tcms.psmcdn.net adds 1657ms and costs ~€26/month
Google Tag Manager adds 416ms and costs ~€7/month
www.swappz.com adds 399ms and costs ~€6/month
Microsoft Clarity adds 250ms and costs ~€4/month
Google Tag Manager adds 240ms and costs ~€4/month
88% 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 2340ms 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 1657ms 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 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.
Source: web.dev
Google Tag Manager takes 416ms 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
www.swappz.com takes 399ms 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
Microsoft Clarity takes 250ms 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
Google Tag Manager takes 240ms 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 hrsvzn.psmcode.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.