https://website-laten-maken.nl
Performance
· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
92
GRADE
A
FIX
0
REVIEW
7
PASS
13
INFO
2
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
95
100
100
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.06 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.11 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.072
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.10 s
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
1.11 s
Page Load Progression
Checks
2213 PASS 7 REVIEW
BJS Bundles52 scripts, 119 KB unusedREVIEW
JS Bundles
52 scripts, 119 KB unused
52 scripts, 119 KB unused
Warning::
https://website-laten-maken.nl/assets/index-CVPqMd...: 96 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://website-laten-maken.nl/assets/primitives-D...: 23 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 119 KB
119 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://website-laten-maken.nl/assets/index-CVPqMdnZ.js | 155 KB | 96 KB (62%) | ✓ | 1st |
| https://website-laten-maken.nl/assets/primitives-D8Szdeug.js | 28 KB | 23 KB (83%) | ✓ | 1st |
| https://website-laten-maken.nl/assets/jsx-runtime-Cltr0gcK.js | 3 KB | — | ✓ | 1st |
| https://website-laten-maken.nl/assets/createServerFn-Bk23-1SV.js | 12 KB | — | ✓ | 1st |
| https://website-laten-maken.nl/assets/not-found-i5RsCZif.js | 0 KB | — | ✓ | 1st |
| https://website-laten-maken.nl/assets/invariant-CgFvOqN2.js | 0 KB | — | ✓ | 1st |
| https://website-laten-maken.nl/assets/link-D4iki_Ag.js | 4 KB | — | ✓ | 1st |
| https://website-laten-maken.nl/assets/matchContext-D7fiU5TJ.js | 0 KB | — | ✓ | 1st |
| https://website-laten-maken.nl/assets/route-BzDGWjIx.js | 1 KB | — | ✓ | 1st |
| https://website-laten-maken.nl/assets/preload-helper-Du08JocR.js | 1 KB | — | ✓ | 1st |
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
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
HTTP/3 (QUIC)
HTTP/3 not advertised
HTTP/3 not advertised
Info::
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.
BDocument CompressionDocument response uses gzip; brotli would be ~20% smallerREVIEW
Document Compression
Document response uses gzip; brotli would be ~20% smaller
Document response uses gzip; brotli would be ~20% smaller
Info::
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.
BAsset Compression1 of 1 asset host serve text uncompressedREVIEW
Asset Compression
1 of 1 asset host serve text uncompressed
1 of 1 asset host serve text uncompressed
Warning::
fonts.googleapis.com serves text assets uncompressed (assets: 4)
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)
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
Server-Timing Observability
No Server-Timing header found
No Server-Timing header found
Info::
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.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
BHTTP Cachingno-cache, must-revalidate, max-age=0REVIEW
HTTP Caching
no-cache, must-revalidate, max-age=0
no-cache, must-revalidate, max-age=0
Info::
Cache-Control header is set
Got: no-cache, must-revalidate, max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
no-cache, must-revalidate, max-age=0
| Directive | Value | Meaning |
|---|---|---|
| no-cache | — | Cache but always revalidate first |
| must-revalidate | — | Must recheck with server after expiry |
| max-age | 0 | Cache for 0 seconds |
A+Page Weight Budget540 KB transferred, 64 requestsPASS
Page Weight Budget
540 KB transferred, 64 requests
540 KB transferred, 64 requests
Info::
Page weighs 1.4 MB (540 KB transferred)
Info::
64 HTTP requests
Info::
Estimated 0.11 g CO2 per page load
540 KB transferred
64 requests
0.11 g CO2 per page load
JavaScript 309.7 KiB 57%
Images 138.9 KiB 26%
CSS 47.2 KiB 9%
Fonts 23.9 KiB 4%
HTML 11.4 KiB 2%
Other 8.1 KiB 2%
Other 694 B 0%
Other 88 B 0%
Other 83 B 0%
0 2.4 MB 4.9 MB
Under budget
A+Third-Party Impact5% third-party, 0 ms blockingPASS
Third-Party Impact
5% third-party, 0 ms blocking
5% third-party, 0 ms blocking
Info::
Third-party code accounts for 5% of page weight (27.4 KiB of 540.0 KiB)
Info::
Third-party blocking time is low (0 ms)
95%
First-party Third-party
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+Image Optimization2 images, 0 KB saveablePASS
Image Optimization
2 images, 0 KB saveable
2 images, 0 KB saveable
Info::
All images are well-optimized
2 images 139 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+JS Execution Cost270ms total JS executionPASS
JS Execution Cost
270ms total JS execution
270ms total JS execution
Info::
https://website-laten-maken.nl/: 126ms CPU time
Info::
https://website-laten-maken.nl/assets/index-CVPqMd...: 78ms CPU time
Info::
Unattributable: 67ms CPU time
Main Thread Breakdown
Other 33% Style & Layout 29% Script Evaluation 28% Rendering 5%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://website-laten-maken.nl/ | 126ms | 3ms | 1ms | 1st |
| https://website-laten-maken.nl/assets/index-CVPqMdnZ.js | 78ms | 72ms | 1ms | 1st |
| Unattributable | 67ms | 2ms | 0ms | 1st |
A+Font Loading1 fonts (24 KB)PASS
Font Loading
1 fonts (24 KB)
1 fonts (24 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
1
24 KB total
Render-blocking
0
of 1
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
xn7gYHE41ni1AdIRggexSvf... woff2 swap
Size 24 KB
Load time 25 ms
Start 875 ms
Risk FOUT — 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 CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
A+Resource HintsNo optimization neededPASS
Resource Hints
No optimization needed
No optimization needed
Info::
No resource hint issues
A+LCP Image PreloadLCP preload audit not availablePASS
LCP Image Preload
LCP preload audit not available
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+Main HTML Cache-ControlMain HTML uses no-cache -- safe revalidate-on-request policyPASS
Main HTML Cache-Control
Main HTML uses no-cache -- safe revalidate-on-request policy
Main HTML uses no-cache -- safe revalidate-on-request policy
Info::
Main HTML uses no-cache -- safe revalidate-on-request policy
Got: no-cache, must-revalidate, max-age=0
AServer Response Intelligence2 server-response signal(s) detectedPASS
Server Response Intelligence
2 server-response signal(s) detected
2 server-response signal(s) detected
Warning::
Compressed response missing `Vary` header
The page is served with `Content-Encoding: gzip` but has no `Vary` header. Without `Vary: Accept-Encoding`, intermediary caches (corporate proxies, ISP caches) may serve the compressed variant to clients that didn't send the matching `Accept-Encoding` -- the client sees garbled bytes. Add `Vary: Accept-Encoding` whenever the response is conditionally compressed.
Info::
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+Page Weight Inventory64 resources · 540 KB · 119 KB savings availablePASS
Page Weight Inventory
64 resources · 540 KB · 119 KB savings available
64 resources · 540 KB · 119 KB savings available
Info::
Within 1MB page-weight target
Got: 540 KB
Info::
~119 KB of savings available
Info::
3 third-party resources (5% of weight)
64 resources · 540.0 KiB · 3 third-party Within 1MB page-weight target
JavaScript 57% · 309.7 KiB
Image 27% · 147.0 KiB
CSS 9% · 47.2 KiB
Font 4% · 23.9 KiB
Document 2% · 11.4 KiB
Other 0% · 865 B
~119.3 KiB of savings available
Remove unused JavaScript: 119.3 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 64 resources | 540.0 KiB | ||||||
Network Waterfall64 requests over 1357msINFO
Network Waterfall
64 requests over 1357ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization7 images, 423 KB total, 127 KB wastedINFO
Image Optimization
7 images, 423 KB total, 127 KB wasted
Image Optimization Audit
Total Images
7
Total Size
423 KB
Oversized
2
Wasted
127 KB
7 missing dimensions 2 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.