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https://frebsite.nl

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
98
GRADE
A+
FIX
1
REVIEW
0
PASS
14
INFO
2

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

Mobile Desktop
83
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
69
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

2.79 s

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

3.96 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.

0.000

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

2.79 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.

3.96 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
17
14 PASS 1 FIX
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.

A+
Page Weight Budget
413 KB transferred, 9 requests
PASS
413 KB transferred, 9 requests
Info::
Page weighs 447 KB (413 KB transferred)
Info::
9 HTTP requests
Info::
Estimated 0.08 g CO2 per page load
413 KB / 2.4 MB budget
413 KB transferred
9 requests
0.08 g CO2 per page load
Images 302.7 KiB 73%
Fonts 96.7 KiB 23%
CSS 10.9 KiB 3%
HTML 1.7 KiB 0%
Other 1.2 KiB 0%
0 2.4 MB 4.9 MB
Under budget
A
Third-Party Impact
25% third-party, 0 ms blocking
PASS
25% third-party, 0 ms blocking
Info::
Third-party code accounts for 25% of page weight (105.1 KiB of 413.2 KiB)
Info::
Third-party blocking time is low (0 ms)
75%
25%
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
1 images, 0 KB saveable
PASS
1 images, 0 KB saveable
Info::
All images are well-optimized
1 images 303 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
448ms total JS execution
PASS
448ms total JS execution
Warning::
https://frebsite.nl/: 271ms CPU time
Info::
Unattributable: 177ms CPU time
Info::
Third-party scripts: 177ms (40% of total)

Main Thread Breakdown

Other 62% Style & Layout 25% Script Evaluation 5% Parse HTML & CSS 4% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://frebsite.nl/271ms8ms1ms1st
Unattributable177ms11ms0ms3rd
A+
Font Loading
3 fonts (97 KB)
PASS
3 fonts (97 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

97 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.8 s LCP 4.0 shttps://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0fontawesome-webfont.woff2 https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0 — 75.9 KiB — 32 ms — font-display: swaphttps://fonts.gstatic.com/s/kanit/v17/nKKU-Go6G5tXcr5aOhWnVaFrNlJz.woff2nKKU-Go6G5tXcr5aOhWnVaF... https://fonts.gstatic.com/s/kanit/v17/nKKU-Go6G5tXcr5aOhWnVaFrNlJz.woff2 — 10.5 KiB — 10 ms — font-display: swaphttps://fonts.gstatic.com/s/kanit/v17/nKKU-Go6G5tXcr4-ORWnVaFrNlJz.woff2nKKU-Go6G5tXcr4-ORWnVaF... https://fonts.gstatic.com/s/kanit/v17/nKKU-Go6G5tXcr4-ORWnVaFrNlJz.woff2 — 10.2 KiB — 13 ms — font-display: swap
fontawesome-webfont.woff2 woff2 swap
Size 76 KB
Load time 32 ms
Start 108 ms
Risk FOUT — text flashes from fallback to web font
nKKU-Go6G5tXcr5aOhWnVaF... woff2 swap
Size 11 KB
Load time 10 ms
Start 110 ms
Risk FOUT — text flashes from fallback to web font
nKKU-Go6G5tXcr4-ORWnVaF... woff2 swap
Size 10 KB
Load time 13 ms
Start 111 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+
JS Bundles
No JavaScript
PASS
No JavaScript
Info::
No JavaScript bundles
No JavaScript files loaded.
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+
Page Weight Inventory
9 resources · 413 KB · 0 KB savings available
PASS
9 resources · 413 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 413 KB
Info::
5 third-party resources (25% of weight)
Info::
1 resources over 200KB
9 resources · 413.2 KiB · 5 third-party Within 1MB page-weight target
Image 74% · 304.0 KiB
Font 23% · 96.7 KiB
CSS 3% · 10.9 KiB
Document 0% · 1.7 KiB
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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Combell

Network Waterfall
9 requests over 140ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.8 s LCP 4.0 shttps://frebsite.nl// https://frebsite.nl/ — 200 — 1.7 KiB — 26 ms — h2https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.cssmaxcdn.bootstrapcdn.com/font-awesom... https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css — 200 — 7.4 KiB — 30 ms — h3https://fonts.googleapis.com/css?family=Kanit:200,300,700,900fonts.googleapis.com/css?family=Kan... https://fonts.googleapis.com/css?family=Kanit:200,300,700,900 — 200 — 1.0 KiB — 22 ms — h2https://frebsite.nl/css/layout.css/css/layout.css https://frebsite.nl/css/layout.css — 200 — 2.4 KiB — 11 ms — h2https://frebsite.nl/img/bg-side.png/img/bg-side.png https://frebsite.nl/img/bg-side.png — 200 — 302.7 KiB — 41 ms — h2https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0maxcdn.bootstrapcdn.com/font-awesom... https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0 — 200 — 75.9 KiB — 32 ms — h3https://fonts.gstatic.com/s/kanit/v17/nKKU-Go6G5tXcr5aOhWnVaFrNlJz.woff2fonts.gstatic.com/s/kanit/v17/nKKU-... https://fonts.gstatic.com/s/kanit/v17/nKKU-Go6G5tXcr5aOhWnVaFrNlJz.woff2 — 200 — 10.5 KiB — 10 ms — h3https://fonts.gstatic.com/s/kanit/v17/nKKU-Go6G5tXcr4-ORWnVaFrNlJz.woff2fonts.gstatic.com/s/kanit/v17/nKKU-... https://fonts.gstatic.com/s/kanit/v17/nKKU-Go6G5tXcr4-ORWnVaFrNlJz.woff2 — 200 — 10.2 KiB — 13 ms — h3https://frebsite.nl/favicon/favicon-32x32.png/favicon/favicon-32x32.png https://frebsite.nl/favicon/favicon-32x32.png — 200 — 1.2 KiB — 19 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
40% of JavaScript execution is third-party
First-party Third-party 177ms · 0KB · €2/mo
Unattributable
Other
Optional
Execution 177ms
Transfer 0 KB
Monthly Cost €2/mo

How third-party costs are calculated

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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