Performance

· 22 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

100

Performance

Accessibility

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.

559 ms

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

559 ms

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.

559 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

559 ms

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

16 PASS 3 REVIEW

Main HTML Cache-Control

Action

Main HTML max-age=14400 (~240min) is aggressive

REVIEW

Main HTML max-age=14400 (~240min) is aggressive

Main HTML cached for 240 minutes -- risks stale auth / SPA state

Long max-age on the main HTML document means users may see outdated auth state, SPA shells, or A/B variants until the cache expires. Consider Cache-Control: no-cache (or max-age=300) for HTML and let your hashed assets (JS/CSS/images) carry the long cache instead.

Got: max-age=14400

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.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Page Weight Budget

114 KB transferred, 18 requests

PASS

114 KB transferred, 18 requests

Page weighs 404 KB (114 KB transferred)

18 HTTP requests

Estimated 0.02 g CO2 per page load

114 KB transferred

18 requests

0.02 g CO2 per page load

HTML 81.0 KiB 71%

JavaScript 17.3 KiB 15%

Other 6.5 KiB 6%

Images 4.9 KiB 4%

CSS 1.5 KiB 1%

Other 1.3 KiB 1%

Other 1.0 KiB 1%

0 2.4 MB 4.9 MB

Under budget

A+

Third-Party Impact

No third-party resources

PASS

No third-party resources

No third-party resources detected

No third-party resources detected — all resources are first-party.

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

Image Optimization

6 images, 0 KB saveable

PASS

6 images, 0 KB saveable

is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

6 images 5 KB

0 oversized -0 KB

1 legacy format

1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A+

JS Execution Cost

146ms total JS execution

PASS

146ms total JS execution

https://luxsite.eu/: 85ms CPU time

https://luxsite.eu/cdn-cgi/challenge-platform/scri...: 60ms CPU time

Main Thread Breakdown

Script Evaluation 44% Other 24% Style & Layout 20% Parse HTML & CSS 7%

Script	Total	Scripting	Parse/Compile	Party
https://luxsite.eu/	85ms	22ms	2ms	1st
https://luxsite.eu/cdn-cgi/challenge-platform/scripts/jsd/main.js?ray=a5441919ec14347e	60ms	56ms	1ms	1st

A+

Font Loading

No web fonts (system fonts)

PASS

No web fonts (system fonts)

No web fonts loaded — system fonts are fastest

No web fonts loaded — system fonts are optimal.

A+

JS Bundles

1 scripts, 0 KB unused

PASS

1 scripts, 0 KB unused

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://luxsite.eu/cdn-cgi/challenge-platform/h/b/scripts/jsd/d0d7f3571048/main.js?ray=a5441919ec14347e	17 KB	—	✓	1st

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

A+

HTTP/3 (QUIC)

HTTP/3 advertised via Alt-Svc

PASS

HTTP/3 advertised via Alt-Svc

HTTP/3 (QUIC) is supported

First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.

A+

Document Compression

Document response uses brotli

PASS

Document response uses brotli

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+

LCP Image Preload

LCP preload audit not available

PASS

LCP preload audit not available

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

`Vary` header declared: accept-encoding

The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).

`Last-Modified` present -- timestamp-based conditional GET supported

Consider also setting `ETag` for stronger revalidation -- ETags are content hashes that don't suffer from clock-skew or DST issues. Last-Modified alone is functional for conditional GETs and not a bug.

A+

Page Weight Inventory

18 resources · 114 KB · 0 KB savings available

PASS

18 resources · 114 KB · 0 KB savings available

Within 1MB page-weight target

Got: 114 KB

8 third-party resources (0% of weight)

18 resources · 113.5 KiB · 8 third-party Within 1MB page-weight target

Document 77% · 87.5 KiB

JavaScript 15% · 17.3 KiB

Image 5% · 6.0 KiB

CSS 1% · 1.5 KiB

Other 1% · 1.3 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

18 resources			113.5 KiB

A+

HTTP Caching

max-age=14400 (4 hours)

PASS

max-age=14400 (4 hours)

Cache-Control header is set

Got: max-age=14400

Effective TTL: 4 hours (max-age=14400)

Last-Modified header present

Cache-Control

max-age=14400

Directive	Value	Meaning
max-age	14400	Cache for 4 hours

Effective TTL: 14400 seconds

Asset Compression

No text asset hosts to measure

INFO

No text asset hosts to measure

No third-party or subdomain host served enough text assets to measure

Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.

Network Waterfall

18 requests over 458ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Image Optimization

1 images, 7 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

7 KB

1 missing dimensions 1 missing lazy loading

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.