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
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.
Whether the site is served from green-energy infrastructure
REVIEW
Green Hosting
No green hosting detected
A
Page Weight Budget
936 KB transferred, 56 requests
PASS
936 KB transferred, 56 requests
Info::
✓
Page weighs 2.6 MB (936 KB transferred)
Info::
i
56 HTTP requests
Info::
i
Estimated 0.19 g CO2 per page load
936 KBtransferred
56 requests
0.19 g CO2 per page load
JavaScript455.7 KiB49%
Fonts161.0 KiB17%
Images154.6 KiB17%
HTML103.1 KiB11%
CSS50.4 KiB5%
Other8.9 KiB1%
Other2.2 KiB0%
02.4 MB4.9 MB
Under budget
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
4 fonts (161 KB)
PASS
4 fonts (161 KB)
Info::
i
4 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
4
161 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
memvYaGs126MiZpBA-UvWbX...woff2swap
Size42 KB
Load time407 ms
Start937 ms
RiskFOUT — text flashes from fallback to web font
fa-solid-900.woff2woff2swap
Size77 KB
Load time537 ms
Start938 ms
RiskFOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX...woff2swap
Size42 KB
Load time177 ms
Start3.9 s
RiskFOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX...woff2swap
Size0 KB
Load time170 ms
Start3.9 s
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
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.
Network Waterfall
56 requests over 4138ms
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-party546ms · 151KB · €6/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
sitevalue.net
sitevalue.net
Other
169ms
0 KB
—
€2/mo
Optional
sitevalue.net
sitevalue.net
Other
154ms
6 KB
—
€2/mo
Optional
fundingchoicesmessages.google.com
fundingchoicesmessages.google.com
Other
107ms
69 KB
—
€1/mo
Optional
sitevalue.net
sitevalue.net
Other
62ms
4 KB
—
€1/mo
Optional
fundingchoicesmessages.google.com
fundingchoicesmessages.google.com
Other
54ms
70 KB
51%
€1/mo
Optional
sitevalue.net
Other
Optional
Execution169ms
Transfer0 KB
Monthly Cost€2/mo
sitevalue.net
Other
Optional
Execution154ms
Transfer6 KB
Monthly Cost€2/mo
fundingchoicesmessages.google.com
Other
Optional
Execution107ms
Transfer69 KB
Monthly Cost€1/mo
sitevalue.net
Other
Optional
Execution62ms
Transfer4 KB
Monthly Cost€1/mo
fundingchoicesmessages.google.com
Other
Optional
Execution54ms
Transfer70 KB
Unused51%
Monthly Cost€1/mo
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
51% of fundingchoicesmessages.google.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.