Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

Mobile Desktop

Performance

Accessibility

100

Best Practices

SEO

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

7.72 s

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

13.27 s

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

7 ms

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

0.000

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

7.72 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.

13.32 s

Page Load Progression

375 ms

750 ms

1.1 s

1.5 s

1.9 s

2.2 s

2.6 s

3.0 s

Checks

12 PASS 9 REVIEW 3 FIX

Page Weight Budget

Action

2.2 MB transferred, 48 requests

FIX

2.2 MB transferred, 48 requests

Page weighs 2.3 MB (2.2 MB transferred)

Fonts are 688 KB — consider subsetting or using system fonts

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

Got: 688 KB

JavaScript is 582 KB — consider code splitting or lazy loading

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

Got: 582 KB

CSS is 428 KB — consider purging unused styles

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Got: 428 KB

48 HTTP requests

Estimated 0.46 g CO2 per page load

2.2 MB transferred

48 requests

0.46 g CO2 per page load

Fonts 688.4 KiB 30%

JavaScript 582.1 KiB 26%

Images 543.0 KiB 24%

CSS 428.3 KiB 19%

HTML 11.2 KiB 0%

Other 5.7 KiB 0%

0 2.4 MB 4.9 MB

Approaching limit

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

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

JS Bundles

Action

11 scripts, 393 KB unused

FIX

11 scripts, 393 KB unused

https://www.waadhoeke.nl/_assets/809ced9c7c6a07f38...: 223 KB unused (89%)

Consider code splitting or tree shaking to reduce unused code.

https://www.waadhoeke.nl/_assets/809ced9c7c6a07f38...: 65 KB unused (82%)

Consider code splitting or tree shaking to reduce unused code.

https://www.waadhoeke.nl/_assets/809ced9c7c6a07f38...: 53 KB unused (63%)

Consider code splitting or tree shaking to reduce unused code.

https://www.waadhoeke.nl/_assets/809ced9c7c6a07f38...: 52 KB unused (78%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 393 KB

393 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.waadhoeke.nl/_assets/809ced9c7c6a07f38af363e0ce924e5d/JavaScript/Contrib/jquery-ui.min.js?1794230948	249 KB	223 KB (89%)	✓	1st
https://www.waadhoeke.nl/_assets/809ced9c7c6a07f38af363e0ce924e5d/JavaScript/Contrib/bootstrap.bundle.min.js?1794230948	79 KB	65 KB (82%)	✓	1st
https://www.waadhoeke.nl/_assets/809ced9c7c6a07f38af363e0ce924e5d/JavaScript/Contrib/jquery-3.7.1.min.js?1794230948	86 KB	53 KB (63%)	✓	1st
https://www.waadhoeke.nl/_assets/809ced9c7c6a07f38af363e0ce924e5d/JavaScript/Contrib/jquery.fancybox.min.js?1794230948	67 KB	52 KB (78%)	✓	1st
https://siteimproveanalytics.com/js/siteanalyze_6006099.js	17 KB	—	✓	3rd
https://meldingen.fryslanveilig.nl/public/widget/1bcbff50216d071764d2dd2c385019dc.js	0 KB	—	✓	3rd
https://f1-eu.readspeaker.com/script/10077/webReader/webReader.js?pids=wr	29 KB	—	✓	3rd
https://www.waadhoeke.nl/_assets/809ced9c7c6a07f38af363e0ce924e5d/JavaScript/Contrib/jquery.autocomplete.min.js?1794230948	14 KB	—	✓	1st
https://www.waadhoeke.nl/_assets/809ced9c7c6a07f38af363e0ce924e5d/JavaScript/general.js?1794230948	7 KB	—	✓	1st
https://www.waadhoeke.nl/_assets/809ced9c7c6a07f38af363e0ce924e5d/JavaScript/fancybox.js?1794230948	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

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

HTTP Caching

Action

no-store (uncacheable)

FIX

no-store (uncacheable)

Cache-Control: no-store prevents all caching

Intentional for dynamic content, but increases server load for every page view.

Got: private, no-store, max-age=0

No ETag or Last-Modified header

Conditional requests (304 Not Modified) are not possible without validators.

Cache-Control

private, no-store, max-age=0

Directive	Value	Meaning
private	—	Only browser cache, not CDN/proxy
no-store	—	Never cache this response
max-age	0	Cache for 0 seconds

Image Optimization

21 images, 0 KB saveable

REVIEW

21 images, 0 KB saveable

All images are well-optimized

21 images 543 KB

0 oversized -0 KB

21 legacy format

0 missing dimensions CLS risk

JS Execution Cost

741ms total JS execution

REVIEW

741ms total JS execution

Unattributable: 364ms CPU time

https://www.waadhoeke.nl/: 241ms CPU time

https://www.waadhoeke.nl/_assets/809ced9c7c6a07f38...: 79ms CPU time

https://www.waadhoeke.nl/_assets/809ced9c7c6a07f38...: 57ms CPU time

Main Thread Breakdown

Other 42% Script Evaluation 22% Style & Layout 21% Script Parsing & Compilation 8% Parse HTML & CSS 4% Rendering 3%

Script	Total	Scripting	Parse/Compile	Party
Unattributable	364ms	8ms	0ms	1st
https://www.waadhoeke.nl/	241ms	10ms	1ms	1st
https://www.waadhoeke.nl/_assets/809ced9c7c6a07f38af363e0ce924e5d/JavaScript/Contrib/jquery-3.7.1.min.js?1794230948	79ms	52ms	7ms	1st
https://www.waadhoeke.nl/_assets/809ced9c7c6a07f38af363e0ce924e5d/JavaScript/Contrib/jquery-ui.min.js?1794230948	57ms	28ms	27ms	1st

HTTP/3 (QUIC)

HTTP/3 not advertised

REVIEW

HTTP/3 not advertised

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.

Document Compression

Document response uses gzip; brotli would be ~20% smaller

REVIEW

Document response uses gzip; brotli would be ~20% smaller

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.

Asset Compression

2 of 2 asset hosts still on gzip

REVIEW

2 of 2 asset hosts still on gzip

f1-eu.readspeaker.com serves assets with gzip; brotli would be ~20% smaller (assets: 3)

Every current browser accepts brotli. On a CDN this is a per-pull-zone toggle (Cloudflare, Fastly, CloudFront, CDN77, Bunny all expose it); on an origin it needs the brotli module (nginx-brotli, Apache mod_brotli). The saving lands on the assets this host serves, not on the HTML document -- the document's own encoding is reported separately.

Got: f1-eu.readspeaker.com (text/css)

meldingen.fryslanveilig.nl serves assets with gzip; brotli would be ~20% smaller (assets: 3)

Got: meldingen.fryslanveilig.nl (text/css)

Server-Timing Observability

No Server-Timing header found

REVIEW

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.

Page Weight Inventory

Action

48 resources · 2.2 MB · 393 KB savings available

REVIEW

48 resources · 2.2 MB · 393 KB savings available

Page weight 2.2 MB exceeds 1 MB target by 1.2 MB

Got: 2.2 MB Expected: ≤ 1 MB

~393 KB of savings available

8 third-party resources (6% of weight)

3 resources over 200KB

48 resources · 2.2 MiB · 8 third-party 1.2 MiB over 1MB target

Font 30% · 688.4 KiB

JavaScript 26% · 582.1 KiB

Image 24% · 548.7 KiB

CSS 19% · 428.3 KiB

Document 0% · 11.2 KiB

~392.7 KiB of savings available

Remove unused JavaScript: 392.7 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

48 resources			2.2 MiB

JavaScript Blocking

1 JS blocking issue(s) detected

REVIEW

1 JS blocking issue(s) detected

8 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.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Third-Party Impact

6% third-party, 0 ms blocking

PASS

6% third-party, 0 ms blocking

Third-party code accounts for 6% of page weight (125.1 KiB of 2.2 MiB)

Third-party blocking time is low (0 ms)

94%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

9 fonts (688 KB)

PASS

9 fonts (688 KB)

9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

688 KB total

Render-blocking

of 9

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

OpenSans-Regular.ttf ttf swap

Size 128 KB

Load time 147 ms

Start 787 ms