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
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.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW
Green Hosting
No green hosting detected
A+
Page Weight Budget
658 KB transferred, 67 requests
PASS
658 KB transferred, 67 requests
Info::
✓
Page weighs 2.2 MB (658 KB transferred)
Info::
i
67 HTTP requests
Info::
i
Estimated 0.13 g CO2 per page load
658 KBtransferred
67 requests
0.13 g CO2 per page load
JavaScript317.9 KiB48%
Images142.6 KiB22%
Fonts114.6 KiB17%
HTML56.2 KiB9%
CSS25.1 KiB4%
Other1.4 KiB0%
Other490 B0%
Other0 B0%
Other0 B0%
02.4 MB4.9 MB
Under budget
A+
Third-Party Impact
17% third-party, 0 ms blocking
PASS
17% third-party, 0 ms blocking
Info::
i
Third-party code accounts for 17% of page weight (114.6 KiB of 658.3 KiB)
Info::
✓
Third-party blocking time is low (0 ms)
83%
17%
First-party Third-party
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+
Image Optimization
7 images, 0 KB saveable
PASS
7 images, 0 KB saveable
Info::
✓
All images are well-optimized
7images143 KB
0oversized-0 KB
0legacy format
0missing dimensionsCLS risk
A+
Font Loading
4 fonts (115 KB)
PASS
4 fonts (115 KB)
Info::
i
4 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
4
115 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
Qw3PZQNVED7rKGKxtqIqX5E...ttfswap
Size29 KB
Load time20 ms
Start1.5 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Qw3PZQNVED7rKGKxtqIqX5E...ttfswap
Size28 KB
Load time21 ms
Start1.5 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Qw3PZQNVED7rKGKxtqIqX5E...ttfswap
Size29 KB
Load time17 ms
Start1.5 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Qw3PZQNVED7rKGKxtqIqX5E...ttfswap
Size29 KB
Load time7 ms
Start2.3 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 ~34 KB and ~68 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
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
✓
Page uses 5 resource hint(s)
Current Resource Hints
preconnect
2
preload
2
dns-prefetch
1
prefetch—
5 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+
Compression Algorithm
Main response uses brotli
PASS
Main 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
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).
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
Network Waterfall
67 requests over 2612ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization
36 images, 89 KB total, 0 KB wasted
INFO
Image Optimization Audit
Total Images
36
Total Size
89 KB
1 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.