Performance

· 15 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

100

Accessibility

Best Practices

100

SEO

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

4.29 s

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

4.63 s

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

37 ms

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

0.012

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

6.33 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.

4.63 s

Page Load Progression

1.2 s

2.3 s

3.5 s

4.7 s

5.8 s

7.0 s

8.2 s

9.3 s

Checks

8 PASS 3 REVIEW 2 FIX

Third-Party Impact

Action

100% third-party, 0 ms blocking

FIX

100% third-party, 0 ms blocking

Third-party code accounts for 100% of page weight (524.5 KiB of 524.9 KiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

HTTP Caching

Action

No cache headers

FIX

No cache headers

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.

Image Optimization

Action

6 images, 0 KB saveable

REVIEW

6 images, 0 KB saveable

https://cdn.pickx.be/images/pickx-logo.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://cdn.pickx.be/images/proximus.png is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

6 images 16 KB

0 oversized -0 KB

6 legacy format

2 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

JS Bundles

11 scripts, 95 KB unused

REVIEW

11 scripts, 95 KB unused

https://assets.adobedtm.com/launch-EN89472e8896784...: 48 KB unused (29%)

Consider code splitting or tree shaking to reduce unused code.

https://cdn.cookielaw.org/scripttemplates/202211.1...: 47 KB unused (52%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 95 KB

95 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://assets.adobedtm.com/launch-EN89472e88967842dbbddfd65fe6e73cda.min.js	165 KB	48 KB (29%)	✓	3rd
https://cdn.cookielaw.org/scripttemplates/202211.1.0/otBannerSdk.js	92 KB	47 KB (52%)	✓	3rd
https://smetrics.proximus.be/id?d_visid_ver=5.5.0&d_fieldgroup=A&mcorgid=84930DFF561D0A627F000101%40AdobeOrg&mid=76295716114660932596833508133684435597&ts=1776889759269	0 KB	—	✓	3rd
https://cdn.cookielaw.org/consent/e581b9c0-d1ee-4261-9da3-1a10f7b42359/otSDKStub.js	8 KB	—	✓	3rd
https://www.proximus.be/resources/cdn/webcomponents/packs/gdpr-js-pack.js	5 KB	—	✓	3rd
https://www.pickx.be/tagging.js?id=&name=language%20selection%20:%20pickx&categories%5B0%5D=language%20choice&language=nl&datePublished=&nodeType=	1 KB	—	✓	3rd
https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement.min.js	13 KB	—	✓	3rd
https://assets.adobedtm.com/4518e9138457/5f49a777cdb9/5214cd2501d9/RC49196d71b6ec4eecb46b0828ec9e0786-source.min.js	3 KB	—	✓	3rd
https://assets.adobedtm.com/4518e9138457/5f49a777cdb9/5214cd2501d9/RC98fb9a31abca4c829273cc7f4ddae0b5-source.min.js	1 KB	—	✓	3rd
https://assets.adobedtm.com/4518e9138457/5f49a777cdb9/5214cd2501d9/RC099ec8d262e347c184b7569a68448326-source.min.js	0 KB	—	✓	3rd

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

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Page Weight Budget

525 KB transferred, 39 requests

PASS

525 KB transferred, 39 requests

Page weighs 2.3 MB (525 KB transferred)

39 HTTP requests

Estimated 0.11 g CO2 per page load

525 KB transferred

39 requests

0.11 g CO2 per page load

JavaScript 290.7 KiB 55%

CSS 114.0 KiB 22%

Fonts 52.9 KiB 10%

Other 41.5 KiB 8%

Images 16.3 KiB 3%

Other 4.4 KiB 1%

Other 2.4 KiB 0%

HTML 2.2 KiB 0%

Other 589 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

JS Execution Cost

485ms total JS execution

PASS

485ms total JS execution

Unattributable: 150ms CPU time

https://www.pickx.be/: 140ms CPU time

https://assets.adobedtm.com/launch-EN89472e8896784...: 120ms CPU time

https://cdn.cookielaw.org/scripttemplates/202211.1...: 76ms CPU time

Third-party scripts: 485ms (100% of total)

Main Thread Breakdown

Script Evaluation 35% Other 30% Style & Layout 12% Script Parsing & Compilation 10% Rendering 8% Parse HTML & CSS 5%

Script	Total	Scripting	Parse/Compile	Party
Unattributable	150ms	16ms	0ms	3rd
https://www.pickx.be/	140ms	15ms	0ms	3rd
https://assets.adobedtm.com/launch-EN89472e88967842dbbddfd65fe6e73cda.min.js	120ms	71ms	35ms	3rd
https://cdn.cookielaw.org/scripttemplates/202211.1.0/otBannerSdk.js	76ms	47ms	16ms	3rd

A+

Font Loading

2 fonts (53 KB)

PASS

2 fonts (53 KB)

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

Web fonts

53 KB total

Render-blocking

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

Proximus-Bold.a70ee655.... woff swap

Size 26 KB

Load time 10 ms

Start 6.6 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

Proximus-Regular.11ea15... woff swap

Size 27 KB

Load time 13 ms

Start 6.6 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

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 ~16 KB and ~32 ms

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

Page Weight Inventory

39 resources · 525 KB · 95 KB savings available

PASS

39 resources · 525 KB · 95 KB savings available

Within 1MB page-weight target

Got: 525 KB

~95 KB of savings available

38 third-party resources (100% of weight)

39 resources · 524.9 KiB · 38 third-party Within 1MB page-weight target

JavaScript 55% · 291.1 KiB

CSS 22% · 117.8 KiB

Font 10% · 52.9 KiB

Other 8% · 39.7 KiB

Image 4% · 19.8 KiB

Document 1% · 3.5 KiB

~95.1 KiB of savings available

Remove unused JavaScript: 95.1 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

39 resources			524.9 KiB

Network Waterfall

39 requests over 7078ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

100% of JavaScript execution is third-party

First-party Third-party 485ms · 259KB · €5/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	150ms	0 KB	—	€2/mo	Optional
www.pickx.be www.pickx.be	Other	140ms	2 KB	—	€2/mo	Optional
assets.adobedtm.com assets.adobedtm.com	Other	120ms	165 KB	29%	€1/mo	Optional
OneTrust cdn.cookielaw.org	Consent	76ms	92 KB	52%	€1/mo	Essential

Unattributable

Other

Optional

Execution 150ms

Transfer 0 KB

Monthly Cost €2/mo

www.pickx.be

Other

Optional

Execution 140ms

Transfer 2 KB

Monthly Cost €2/mo

assets.adobedtm.com

Other

Optional

Execution 120ms

Transfer 165 KB

Unused 29%

Monthly Cost €1/mo

OneTrust

Consent

Essential

Execution 76ms

Transfer 92 KB

Unused 52%

Monthly Cost €1/mo

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

52% of OneTrust's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

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.