https://headroommedia.nl/images/clients/D2025/In2V... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Rabo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Nutr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Fokk... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Wehk... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Bosc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/caiw... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/epo.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Lekk... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/SEW.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/flai... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Jant... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Rona... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Bols... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Smur... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Achm... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/AOB.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Akzo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Hilv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/Logo/Logo150.png#j... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Yond... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Car-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Siev... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Amar... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Vall... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Kuij... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/mead... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Tric... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://headroommedia.nl/images/clients/D2025/Qolo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
39images1.9 MB
0oversized-0 KB
35legacy format
29missing 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
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
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.
B
Document Compression
Document response uses gzip; brotli would be ~20% smaller
REVIEW
Document 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
Asset Compression
1 of 1 asset host serve text uncompressed
REVIEW
1 of 1 asset host serve text uncompressed
Warning::
!
fonts.googleapis.com serves text assets uncompressed (assets: 6)
The sampled response carries a text content type but no Content-Encoding, so the bytes go over the wire raw. Text compression typically removes 70-80% of a JS or CSS payload -- this is the single cheapest transfer win available on this host.
Got: fonts.googleapis.com (text/css)
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.
14 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+
Third-Party Impact
No third-party resources
PASS
No third-party resources
Info::
✓
No third-party resources detected
No third-party resources detected — all resources are first-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+
Font Loading
11 fonts (311 KB)
PASS
11 fonts (311 KB)
Info::
i
11 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
11
311 KB total
Render-blocking
0
of 11
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
ares.woffwoffswap
Size7 KB
Load time176 ms
Start2.8 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
HTxqL289NzCGg4MzN6KJ7eW...woff2swap
Size18 KB
Load time176 ms
Start2.8 s
RiskFOUT — text flashes from fallback to web font
fa-solid-900.woff2woff2swap
Size77 KB
Load time180 ms
Start2.8 s
RiskFOUT — text flashes from fallback to web font
55xxezRtP9G3CGPIf49hxc8...woff2swap
Size36 KB
Load time176 ms
Start2.8 s
RiskFOUT — text flashes from fallback to web font
JTUSjIg69CK48gW7PXoo9Wl...woff2swap
Size14 KB
Load time176 ms
Start2.8 s
RiskFOUT — text flashes from fallback to web font
fa-brands-400.woff2woff2swap
Size75 KB
Load time181 ms
Start2.8 s
RiskFOUT — text flashes from fallback to web font
fa-regular-400.woff2woff2swap
Size13 KB
Load time176 ms
Start2.8 s
RiskFOUT — text flashes from fallback to web font
fontawesome-webfont.woff2woff2swap
Size70 KB
Load time180 ms
Start2.8 s
RiskFOUT — text flashes from fallback to web font
icoudav.ttfttfswap
Size0 KB
Load time118 ms
Start2.9 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
icoudav.woffwoffswap
Size0 KB
Load time48 ms
Start3.0 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
icoudav.woff2woff2swap
Size0 KB
Load time48 ms
Start3.1 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)
Fixing the unchecked items could save ~2 KB and ~4 ms
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
172 requests over 3650ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers