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
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
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
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
B
Compression Algorithm
Main response uses gzip; brotli would be ~20% smaller
REVIEW
Main response uses gzip; brotli would be ~20% smaller
Info::
i
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
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.
B
JavaScript Blocking
1 JS blocking issue(s) detected
REVIEW
1 JS blocking issue(s) detected
Warning::
!
6 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.
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
15 fonts (397 KB)
PASS
15 fonts (397 KB)
Info::
i
15 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
15
397 KB total
Render-blocking
0
of 15
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
lwoff2swap
Size61 KB
Load time11 ms
Start537 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size60 KB
Load time11 ms
Start537 ms
RiskFOUT — text flashes from fallback to web font
S6u8w4BMUTPHh30AXC-qNiX...woff2swap
Size13 KB
Load time33 ms
Start540 ms
RiskFOUT — text flashes from fallback to web font
S6u-w4BMUTPHjxsIPx-oPCL...woff2swap
Size14 KB
Load time57 ms
Start540 ms
RiskFOUT — text flashes from fallback to web font
S6u9w4BMUTPHh7USSwiPGQ3...woff2swap
Size14 KB
Load time66 ms
Start540 ms
RiskFOUT — text flashes from fallback to web font
S6u_w4BMUTPHjxsI9w2_Gwf...woff2swap
Size14 KB
Load time47 ms
Start541 ms
RiskFOUT — text flashes from fallback to web font
S6uyw4BMUTPHjx4wXiWtFCc...woff2swap
Size14 KB
Load time37 ms
Start542 ms
RiskFOUT — text flashes from fallback to web font
S6u8w4BMUTPHjxsAXC-qNiX...woff2swap
Size15 KB
Load time72 ms
Start547 ms
RiskFOUT — text flashes from fallback to web font
S6u9w4BMUTPHh6UVSwiPGQ3...woff2swap
Size14 KB
Load time64 ms
Start547 ms
RiskFOUT — text flashes from fallback to web font
S6u_w4BMUTPHjxsI5wq_Gwf...woff2swap
Size15 KB
Load time78 ms
Start547 ms
RiskFOUT — text flashes from fallback to web font
S6u9w4BMUTPHh50XSwiPGQ3...woff2swap
Size13 KB
Load time76 ms
Start547 ms
RiskFOUT — text flashes from fallback to web font
S6u_w4BMUTPHjxsI3wi_Gwf...woff2swap
Size14 KB
Load time81 ms
Start547 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size60 KB
Load time7 ms
Start621 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size38 KB
Load time11 ms
Start621 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size38 KB
Load time17 ms
Start622 ms
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)
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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
✓
Page uses 3 resource hint(s)
Current Resource Hints
preconnect
3
preload—
dns-prefetch—
prefetch—
3 resource hints configured
A+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
✓
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
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
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::
✓
`Last-Modified` present -- timestamp-based conditional GET supported
Consider also setting `ETag` for stronger revalidation -- ETags are content hashes that don't suffer from clock-skew or DST issues. Last-Modified alone is functional for conditional GETs and not a bug.
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
Network Waterfall
81 requests over 1524ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
56%of JavaScript execution is third-party
First-party Third-party983ms · 253KB · €11/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
cdn.prod.website-files.com
cdn.prod.website-files.com
Other
610ms
47 KB
—
€7/mo
Costly
d3e54v103j8qbb.cloudfront.net
d3e54v103j8qbb.cloudfront.net
Other
145ms
30 KB
—
€2/mo
Optional
cdn-cookieyes.com
cdn-cookieyes.com
Other
95ms
9 KB
—
€1/mo
Optional
cdn-cookieyes.com
cdn-cookieyes.com
Other
68ms
8 KB
—
€1/mo
Optional
jsDelivr
cdn.jsdelivr.net
CDN
65ms
158 KB
91%
€1/mo
Optional
cdn.prod.website-files.com
Other
Costly
Execution610ms
Transfer47 KB
Monthly Cost€7/mo
d3e54v103j8qbb.cloudfront.net
Other
Optional
Execution145ms
Transfer30 KB
Monthly Cost€2/mo
cdn-cookieyes.com
Other
Optional
Execution95ms
Transfer9 KB
Monthly Cost€1/mo
cdn-cookieyes.com
Other
Optional
Execution68ms
Transfer8 KB
Monthly Cost€1/mo
jsDelivr
CDN
Optional
Execution65ms
Transfer158 KB
Unused91%
Monthly Cost€1/mo
These scripts may cost more than they're worth
cdn.prod.website-files.com adds 610ms and costs ~€7/month
56% of JavaScript execution time comes from third-party scripts.
Why this matters
Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.
Learn more ▾▴
Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.
Source: web.dev / HTTP Archive Web Almanac
cdn.prod.website-files.com takes 610ms 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
91% of jsDelivr'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.