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https://luxsite.eu

Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
95
GRADE
A
FIX
0
REVIEW
4
PASS
19
INFO
3

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

Mobile Desktop
96
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

2.14 s

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

2.14 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.

2.81 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.

2.14 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
26
19 PASS 4 REVIEW
B
JS Execution Cost
678ms total JS execution
REVIEW
678ms total JS execution
Warning::
https://luxsite.eu/: 322ms CPU time
Info::
https://luxsite.eu/cdn-cgi/challenge-platform/scri...: 237ms CPU time
Info::
Unattributable: 119ms CPU time

Main Thread Breakdown

Script Evaluation 44% Other 24% Style & Layout 18% Parse HTML & CSS 7% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://luxsite.eu/322ms77ms6ms1st
https://luxsite.eu/cdn-cgi/challenge-platform/scripts/jsd/main.js?ray=a54418be0eaedc71237ms221ms4ms1st
Unattributable119ms5ms0ms1st
C
Main HTML Cache-Control
Action
Main HTML max-age=14400 (~240min) is aggressive
REVIEW
Main HTML max-age=14400 (~240min) is aggressive
Warning::
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
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.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
119 KB transferred, 19 requests
PASS
119 KB transferred, 19 requests
Info::
Page weighs 414 KB (119 KB transferred)
Info::
19 HTTP requests
Info::
Estimated 0.02 g CO2 per page load
119 KB / 2.4 MB budget
119 KB transferred
19 requests
0.02 g CO2 per page load
HTML 81.0 KiB 68%
JavaScript 18.6 KiB 16%
Images 9.8 KiB 8%
Other 6.5 KiB 5%
Other 1.3 KiB 1%
CSS 916 B 1%
Other 584 B 0%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
No third-party resources
PASS
No third-party resources
Info::
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
Info::
All text resources are compressed
All text resources are properly compressed.
A
Image Optimization
7 images, 0 KB saveable
PASS
7 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
7 images 10 KB
0 oversized -0 KB
2 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+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
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.

ScriptSizeUnusedMinifiedParty
https://luxsite.eu/cdn-cgi/challenge-platform/h/b/scripts/jsd/d0d7f3571048/main.js?ray=a54418be0eaedc7119 KB—✓1st
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+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
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
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+
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
Info::
`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).
Info::
`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
19 resources · 119 KB · 0 KB savings available
PASS
19 resources · 119 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 119 KB
Info::
8 third-party resources (0% of weight)
19 resources · 118.7 KiB · 8 third-party Within 1MB page-weight target
Document 74% · 87.5 KiB
JavaScript 16% · 18.6 KiB
Image 9% · 10.9 KiB
CSS 1% · 916 B
Other 1% · 821 B
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
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
A+
HTTP Caching
max-age=14400 (4 hours)
PASS
max-age=14400 (4 hours)
Info::
Cache-Control header is set
Got: max-age=14400
Info::
Effective TTL: 4 hours (max-age=14400)
Info::
Last-Modified header present
Cache-Control

max-age=14400

DirectiveValueMeaning
max-age14400Cache for 4 hours
Effective TTL: 14400 seconds
Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
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
19 requests over 1493ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 2.1 s LCP 2.1 shttps://luxsite.eu// https://luxsite.eu/ — 200 — 81.0 KiB — 114 ms — h2https://www.luxsite.cz/wp-content/uploads/elementor/google-fonts/css/roboto.css?ver=1743267912www.luxsite.cz/wp-content/uploads/e... https://www.luxsite.cz/wp-content/uploads/elementor/google-fonts/css/roboto.css?ver=1743267912 — -1 — 0 B — 47 ms — https://www.luxsite.cz/wp-content/uploads/elementor/google-fonts/css/robotoslab.css?ver=1743267917www.luxsite.cz/wp-content/uploads/e... https://www.luxsite.cz/wp-content/uploads/elementor/google-fonts/css/robotoslab.css?ver=1743267917 — -1 — 0 B — 47 ms — https://www.luxsite.cz/wp-content/uploads/elementor/google-fonts/css/ibmplexsans.css?ver=1743267925www.luxsite.cz/wp-content/uploads/e... https://www.luxsite.cz/wp-content/uploads/elementor/google-fonts/css/ibmplexsans.css?ver=1743267925 — -1 — 0 B — 47 ms — https://www.luxsite.cz/wp-content/uploads/elementor/google-fonts/css/poppins.css?ver=1743267927www.luxsite.cz/wp-content/uploads/e... https://www.luxsite.cz/wp-content/uploads/elementor/google-fonts/css/poppins.css?ver=1743267927 — -1 — 0 B — 47 ms — https://luxsite.eu/wp-content/litespeed/css/e7ab1793a44c008f2271c473400544a5.css?ver=961b5/wp-content/litespeed/css/e7ab1793a... https://luxsite.eu/wp-content/litespeed/css/e7ab1793a44c008f2271c473400544a5.css?ver=961b5 — 429 — 422 B — 168 ms — h2data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI1MTIiIGhla…data:image/svg+xml;base64,PHN2ZyB4b... data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI1MTIiIGhla… — 200 — 0 B — 0 ms — datadata:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI4MDAiIGhla…data:image/svg+xml;base64,PHN2ZyB4b... data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI4MDAiIGhla… — 200 — 0 B — 0 ms — datadata:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI1MzciIGhla…data:image/svg+xml;base64,PHN2ZyB4b... data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI1MzciIGhla… — 200 — 0 B — 0 ms — datahttps://luxsite.eu/wp-content/uploads/trustindex-google-widget-gdpr.css?1793570382/wp-content/uploads/trustindex-goog... https://luxsite.eu/wp-content/uploads/trustindex-google-widget-gdpr.css?1793570382 — 429 — 251 B — 170 ms — h2https://luxsite.eu/wp-content/uploads/trustindex-google-widget-gdpr.css/wp-content/uploads/trustindex-goog... https://luxsite.eu/wp-content/uploads/trustindex-google-widget-gdpr.css — 429 — 243 B — 171 ms — h2data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0OTMiIGhla…data:image/svg+xml;base64,PHN2ZyB4b... data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0OTMiIGhla… — 200 — 0 B — 0 ms — datahttps://luxsite.eu/wp-content/plugins/litespeed-cache/guest.vary.php/wp-content/plugins/litespeed-cache... https://luxsite.eu/wp-content/plugins/litespeed-cache/guest.vary.php — 429 — 6.5 KiB — 175 ms — h3https://luxsite.eu/cdn-cgi/challenge-platform/scripts/jsd/main.js?ray=a54418be0eaedc71/cdn-cgi/challenge-platform/scripts... https://luxsite.eu/cdn-cgi/challenge-platform/scripts/jsd/main.js?ray=a54418be0eaedc71 — 302 — 237 B — 37 ms — h3https://luxsite.eu/wp-content/uploads/2025/12/cropped-logo-seo2-32x32.webp/wp-content/uploads/2025/12/cropped... https://luxsite.eu/wp-content/uploads/2025/12/cropped-logo-seo2-32x32.webp — 200 — 1.1 KiB — 30 ms — h3https://luxsite.eu/cdn-cgi/challenge-platform/h/b/scripts/jsd/d0d7f3571048/main.js?ray=a54418be0eaedc71/cdn-cgi/challenge-platform/h/b/scr... https://luxsite.eu/cdn-cgi/challenge-platform/h/b/scripts/jsd/d0d7f3571048/main.js?ray=a54418be0eaedc71 — 200 — 18.6 KiB — 37 ms — h3https://luxsite.eu/cdn-cgi/challenge-platform/h/b/jsd/oneshot/d0d7f3571048/0.16101215578692152:1793628626:1Omh-_aiWoLQQdZ98o4NQxRQPKccc3NCRhKbCznf-RI/a54418be0eaedc71/cdn-cgi/challenge-platform/h/b/jsd... https://luxsite.eu/cdn-cgi/challenge-platform/h/b/jsd/oneshot/d0d7f3571048/0.16101215578692152:1793628626:1Omh-_aiWoLQQdZ98o4NQxRQPKccc3NCRhKbCznf-RI/a54418be0eaedc71 — 200 — 584 B — 25 ms — h3https://luxsite.eu/wp-content/uploads/2025/12/cropped-logo-seo2.webp/wp-content/uploads/2025/12/cropped... https://luxsite.eu/wp-content/uploads/2025/12/cropped-logo-seo2.webp — 429 — 4.9 KiB — 189 ms — h3https://luxsite.eu/wp-content/uploads/2024/11/logo-768x768.png/wp-content/uploads/2024/11/logo-76... https://luxsite.eu/wp-content/uploads/2024/11/logo-768x768.png — 429 — 4.9 KiB — 178 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization
1 images, 7 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

1

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.

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