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Performance

· 28 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
6
REVIEW
4
PASS
14
INFO
4

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
51
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.96 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

21.08 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

568 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.083

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

4.93 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.

22.16 s

Page Load Progression

506 ms
1.0 s
1.5 s
2.0 s
2.5 s
3.0 s
3.5 s
4.0 s
Checks
28
14 PASS 4 REVIEW 6 FIX
F
Page Weight Budget
Action
3.7 MB transferred, 75 requests
FIX
3.7 MB transferred, 75 requests
Warning::
Page weighs 9.6 MB (3.7 MB transferred)
Warning::
JavaScript is 2.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.4 MB
Info::
Fonts are 528 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 528 KB
Info::
75 HTTP requests
Info::
Estimated 0.78 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
75 requests
0.78 g CO2 per page load
JavaScript 2.4 MiB 64%
Fonts 528.4 KiB 14%
Images 420.6 KiB 11%
Other 286.1 KiB 8%
CSS 91.3 KiB 2%
HTML 22.1 KiB 1%
Other 17.5 KiB 0%
Other 1.5 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

D
Third-Party Impact
Action
81% third-party, 0 ms blocking
FIX
81% third-party, 0 ms blocking
Warning::
Third-party code accounts for 81% of page weight (3.0 MiB of 3.7 MiB)
Info::
Third-party blocking time is low (0 ms)
19%
81%
First-party Third-party
D
JS Execution Cost
Action
3438ms total JS execution
FIX
3438ms total JS execution
Warning::
https://www.pijnacker-nootdorp.nl/: 1176ms CPU time
Warning::
https://virtuele-gemeente-assistent.nl/static/js/i...: 755ms CPU time
Warning::
Unattributable: 636ms CPU time
Warning::
https://www.pijnacker-nootdorp.nl/wp-content/theme...: 261ms CPU time
Info::
https://app.tolkie.nl/: 228ms CPU time
Info::
Third-party scripts: 983ms (29% of total)

Main Thread Breakdown

Script Evaluation 33% Other 26% Style & Layout 22% Script Parsing & Compilation 13% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.pijnacker-nootdorp.nl/1176ms11ms7ms1st
https://virtuele-gemeente-assistent.nl/static/js/ida-widget.js755ms380ms374ms3rd
Unattributable636ms14ms0ms1st
https://www.pijnacker-nootdorp.nl/wp-content/themes/theme-fusion/assets/dist/build/frontend.js?ver=ffe9b455712af7899236261ms175ms2ms1st
https://app.tolkie.nl/228ms187ms2ms3rd
https://www.pijnacker-nootdorp.nl/wp-content/plugins/cookie-law-info/lite/frontend/js/script.min.js?ver=3.5.8176ms139ms2ms1st
https://www.pijnacker-nootdorp.nl/wp-includes/js/dist/vendor/react.min.js?ver=18.3.1.1151ms148ms1ms1st
https://www.pijnacker-nootdorp.nl/wp-content/themes/theme-fusion/assets/dist/build/vendor.js?ver=ffe9b455712af789923656ms1ms55ms1st
D
JS Bundles
Action
15 scripts, 467 KB unused
FIX
15 scripts, 467 KB unused
Warning::
https://virtuele-gemeente-assistent.nl/static/js/i...: 377 KB unused (22%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.pijnacker-nootdorp.nl/wp-content/theme...: 89 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 467 KB
467 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://virtuele-gemeente-assistent.nl/static/js/ida-widget.js1719 KB377 KB (22%)✓3rd
https://www.pijnacker-nootdorp.nl/wp-content/themes/theme-fusion/assets/dist/build/vendor.js?ver=ffe9b455712af7899236158 KB89 KB (57%)✓1st
https://www.pijnacker-nootdorp.nl/wp-includes/js/dist/escape-html.min.js?ver=87ebe53e97bba59805a51 KB—✓1st
https://www.pijnacker-nootdorp.nl/wp-includes/js/jquery/jquery.min.js29 KB—✓1st
https://www.pijnacker-nootdorp.nl/wp-includes/js/dist/vendor/react.min.js?ver=18.3.1.15 KB—✓1st
https://www.pijnacker-nootdorp.nl/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.140 KB—✓1st
https://www.pijnacker-nootdorp.nl/wp-content/plugins/cookie-law-info/lite/frontend/js/script.min.js?ver=3.5.88 KB—✓1st
https://www.pijnacker-nootdorp.nl/wp-includes/js/dist/element.min.js?ver=4a4370b2b349066fd4405 KB—✓1st
https://www.pijnacker-nootdorp.nl/wp-content/plugins/the-events-calendar/common/build/js/user-agent.js?ver=da75d0bdea6dde3898df1 KB—✓1st
https://www.pijnacker-nootdorp.nl/wp-content/themes/theme-fusion/assets/dist/build/frontend.js?ver=ffe9b455712af78992365 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

F
Page Weight Inventory
Action
75 resources · 3.7 MB · 467 KB savings available
FIX
75 resources · 3.7 MB · 467 KB savings available
Warning::
Page weight 3.7 MB exceeds 1 MB target by 2.7 MB
Got: 3.7 MB Expected: ≤ 1 MB
Info::
~467 KB of savings available
Warning::
51 third-party resources (81% of weight)
Info::
3 resources over 200KB
75 resources · 3.7 MiB · 51 third-party 2.7 MiB over 1MB target
JavaScript 64% · 2.4 MiB
Image 16% · 609.7 KiB
Font 14% · 528.4 KiB
CSS 5% · 186.6 KiB
Document 1% · 39.7 KiB
Other 0% · 3.2 KiB

~466.6 KiB of savings available

Remove unused JavaScript: 466.6 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
Warning::
https://openpub.pijnacker-nootdorp.nl/wp-content/u... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openpub.pijnacker-nootdorp.nl/wp-content/u... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://openpub.pijnacker-nootdorp.nl/wp-content/u... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
15 images 421 KB
0 oversized -0 KB
10 legacy format
3 missing dimensions CLS 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

B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
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.
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
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::
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.
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
23 fonts (528 KB)
PASS
23 fonts (528 KB)
Info::
23 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

23

528 KB total

Render-blocking

0

of 23

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s FCP 3.0 s LCP 21.1 shttps://www.pijnacker-nootdorp.nl/wp-content/themes/theme-fusion/assets/dist/build//fonts/roboto-v51-latin-regular.0d16261b.woff2roboto-v51-latin-regula... https://www.pijnacker-nootdorp.nl/wp-content/themes/theme-fusion/assets/dist/build//fonts/roboto-v51-latin-regular.0d16261b.woff2 — 21.9 KiB — 40 ms — font-display: swaphttps://www.pijnacker-nootdorp.nl/wp-content/themes/theme-fusion/assets/dist/build//fonts/roboto-v51-latin-700.d89b03c5.woff2roboto-v51-latin-700.d8... https://www.pijnacker-nootdorp.nl/wp-content/themes/theme-fusion/assets/dist/build//fonts/roboto-v51-latin-700.d89b03c5.woff2 — 22.2 KiB — 40 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-12.woff2pro-fa-light-300-12.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-12.woff2 — 20.2 KiB — 41 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-12.woff2pro-fa-regular-400-12.w... https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-12.woff2 — 18.8 KiB — 32 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-0.woff2pro-fa-brands-400-0.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-0.woff2 — 36.9 KiB — 37 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-0.woff2pro-fa-light-300-0.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-0.woff2 — 15.2 KiB — 38 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-1.woff2pro-fa-regular-400-1.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-1.woff2 — 16.7 KiB — 32 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-0.woff2pro-fa-regular-400-0.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-0.woff2 — 14.3 KiB — 56 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-14.woff2pro-fa-light-300-14.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-14.woff2 — 17.3 KiB — 56 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-2.woff2pro-fa-light-300-2.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-2.woff2 — 28.0 KiB — 131 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-16.woff2pro-fa-light-300-16.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-16.woff2 — 22.9 KiB — 56 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-19.woff2pro-fa-regular-400-19.w... https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-19.woff2 — 26.6 KiB — 57 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-14.woff2pro-fa-regular-400-14.w... https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-14.woff2 — 16.4 KiB — 57 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-10.woff2pro-fa-regular-400-10.w... https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-10.woff2 — 26.5 KiB — 57 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-2.woff2pro-fa-regular-400-2.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-2.woff2 — 26.2 KiB — 56 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-21.woff2pro-fa-regular-400-21.w... https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-21.woff2 — 25.2 KiB — 60 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-13.woff2pro-fa-light-300-13.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-13.woff2 — 16.6 KiB — 60 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-1.woff2pro-fa-brands-400-1.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-1.woff2 — 39.5 KiB — 60 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-19.woff2pro-fa-light-300-19.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-19.woff2 — 28.5 KiB — 131 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-10.woff2pro-fa-light-300-10.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-10.woff2 — 29.6 KiB — 48 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-1.woff2pro-fa-light-300-1.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-1.woff2 — 17.8 KiB — 48 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-21.woff2pro-fa-light-300-21.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-21.woff2 — 27.8 KiB — 48 ms — font-display: swaphttps://app.tolkie.nl/fonts/atkinson-hyperlegible-next-latin-700-normal.woff2atkinson-hyperlegible-n... https://app.tolkie.nl/fonts/atkinson-hyperlegible-next-latin-700-normal.woff2 — 13.4 KiB — 19 ms — font-display: swap
roboto-v51-latin-regula... woff2 swap
Size 22 KB
Load time 40 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
roboto-v51-latin-700.d8... woff2 swap
Size 22 KB
Load time 40 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
pro-fa-light-300-12.woff2 woff2 swap
Size 20 KB
Load time 41 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-12.w... woff2 swap
Size 19 KB
Load time 32 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-0.woff2 woff2 swap
Size 37 KB
Load time 37 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-light-300-0.woff2 woff2 swap
Size 15 KB
Load time 38 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-1.woff2 woff2 swap
Size 17 KB
Load time 32 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-0.woff2 woff2 swap
Size 14 KB
Load time 56 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-light-300-14.woff2 woff2 swap
Size 17 KB
Load time 56 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-light-300-2.woff2 woff2 swap
Size 28 KB
Load time 131 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-light-300-16.woff2 woff2 swap
Size 23 KB
Load time 56 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-19.w... woff2 swap
Size 27 KB
Load time 57 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-14.w... woff2 swap
Size 16 KB
Load time 57 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-10.w... woff2 swap
Size 26 KB
Load time 57 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-2.woff2 woff2 swap
Size 26 KB
Load time 56 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-21.w... woff2 swap
Size 25 KB
Load time 60 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-light-300-13.woff2 woff2 swap
Size 17 KB
Load time 60 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-1.woff2 woff2 swap
Size 40 KB
Load time 60 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-light-300-19.woff2 woff2 swap
Size 28 KB
Load time 131 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-light-300-10.woff2 woff2 swap
Size 30 KB
Load time 48 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-light-300-1.woff2 woff2 swap
Size 18 KB
Load time 48 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
pro-fa-light-300-21.woff2 woff2 swap
Size 28 KB
Load time 48 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
atkinson-hyperlegible-n... woff2 swap
Size 13 KB
Load time 19 ms
Start 2.4 s
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 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
1
preload
—
dns-prefetch
1
prefetch
—

2 resource hints configured

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+
Asset Compression
All 1 asset host use brotli
PASS
All 1 asset host use brotli
Info::
app.tolkie.nl serves assets with brotli (assets: 3)
Got: app.tolkie.nl (text/css)
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
Warning::
Compressed response missing `Vary` header
The page is served with `Content-Encoding: br` 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+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
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
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
6 render-blocking stylesheet(s) -- recommended: <=3
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.
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Previder BV

Network Waterfall
75 requests over 2416ms
INFO
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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
29% of JavaScript execution is third-party
First-party Third-party 983ms · 1927KB · €11/mo
virtuele-gemeente-assistent.nl
Other
Costly
Execution 755ms
Transfer 1719 KB
Unused 22%
Monthly Cost €8/mo
app.tolkie.nl
Other
Costly
Execution 228ms
Transfer 207 KB
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • virtuele-gemeente-assistent.nl adds 755ms and costs ~€8/month
  • app.tolkie.nl adds 228ms and costs ~€2/month

virtuele-gemeente-assistent.nl takes 755ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

app.tolkie.nl takes 228ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-10-14 — 2026-11-10)

LCP (p75)

2196 ms

84% good

INP (p75)

79 ms

97% good

CLS (p75)

0.030

99% good

FCP (p75)

1493 ms

TTFB (p75)

1072 ms

This origin passes Core Web Vitals assessment
Image Optimization
15 images, 229 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

15

Total Size

229 KB

10 missing dimensions 12 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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