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
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.
Third-party code accounts for 4% of page weight (308.4 KiB of 8.2 MiB)
Info::
✓
Third-party blocking time is low (0 ms)
96%
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
30 images, 0 KB saveable
PASS
30 images, 0 KB saveable
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vipdrainageserviceslondon.co.uk/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
30images7.1 MB
0oversized-0 KB
0legacy format
23missing 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
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
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
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
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
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
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
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
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
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
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
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
A+
Font Loading
9 fonts (479 KB)
PASS
9 fonts (479 KB)
Info::
i
9 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
9
479 KB total
Render-blocking
0
of 9
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size37 KB
Load time62 ms
Start597 ms
RiskFOUT — text flashes from fallback to web font
fa-brands-400.woff2woff2swap
Size106 KB
Load time117 ms
Start598 ms
RiskFOUT — text flashes from fallback to web font
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
pxiByp8kv8JHgFVrLEj6Z1x...woff2swap
Size8 KB
Load time48 ms
Start598 ms
RiskFOUT — text flashes from fallback to web font
fa-solid-900.woff2woff2swap
Size147 KB
Load time153 ms
Start598 ms
RiskFOUT — text flashes from fallback to web font
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
pxiEyp8kv8JHgFVrJJfecnF...woff2swap
Size8 KB
Load time70 ms
Start598 ms
RiskFOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLDD4Z1x...woff2swap
Size8 KB
Load time88 ms
Start599 ms
RiskFOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLDz8Z1x...woff2swap
Size8 KB
Load time81 ms
Start603 ms
RiskFOUT — text flashes from fallback to web font
bootstrap-icons.woff2woff2swap
Size119 KB
Load time172 ms
Start603 ms
RiskFOUT — text flashes from fallback to web font
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
KFO5CnqEu92Fr1Mu53ZEC9_...woff2swap
Size41 KB
Load time94 ms
Start604 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)
Fixing the unchecked items could save ~185 KB and ~370 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+
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+
Document Compression
Document response uses brotli
PASS
Document 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+
Main HTML Cache-Control
Main HTML uses no-store -- correct for sensitive/dynamic content
PASS
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
✓
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: no-store, no-cache, must-revalidate
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::
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: Hetzner Online GmbH
Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
i
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall
77 requests over 1225ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers