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Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
95
GRADE
A
FIX
1
REVIEW
6
PASS
12
INFO
3

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

Mobile Desktop
100
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.

247 ms

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

450 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.

404 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.

454 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
22
12 PASS 6 REVIEW 1 FIX
D
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.
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
5 images, 0 KB saveable
REVIEW
5 images, 0 KB saveable
Info::
All images are well-optimized
5 images 139 KB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
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.
B
Document Compression
Document response uses gzip; brotli would be ~20% smaller
REVIEW
Document response uses gzip; brotli would be ~20% smaller
Info::
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.
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
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
162 KB transferred, 9 requests
PASS
162 KB transferred, 9 requests
Info::
Page weighs 195 KB (162 KB transferred)
Info::
9 HTTP requests
Info::
Estimated 0.03 g CO2 per page load
162 KB / 2.4 MB budget
162 KB transferred
9 requests
0.03 g CO2 per page load
Images 138.6 KiB 86%
HTML 7.5 KiB 5%
CSS 7.0 KiB 4%
Other 6.2 KiB 4%
JavaScript 2.8 KiB 2%
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+
JS Execution Cost
No JS execution data
PASS
No JS execution data
Info::
No significant JS execution detected

Main Thread Breakdown

Other 46% Style & Layout 35% Script Evaluation 9% Rendering 6% Parse HTML & CSS 4%
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://www.gonetcrm.pl/assets/js/main.js?v=f263a8e93 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+
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::
Both `ETag` and `Last-Modified` present -- efficient revalidation supported
The page returns both `ETag` (content hash) and `Last-Modified` (timestamp) headers. Browsers can issue conditional GETs with `If-None-Match` or `If-Modified-Since`; the server returns 304 Not Modified for unchanged content, saving bandwidth. ETag is the more reliable of the two (timestamps fail in DST transitions and clock skew).
A+
Page Weight Inventory
9 resources · 162 KB · 0 KB savings available
PASS
9 resources · 162 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 162 KB
9 resources · 162.1 KiB · 0 third-party Within 1MB page-weight target
Image 89% · 144.8 KiB
Document 5% · 7.5 KiB
CSS 4% · 7.0 KiB
JavaScript 2% · 2.8 KiB
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
9 requests over 646ms
INFO
0 ms 200 ms 400 ms 600 ms FCP 247 ms LCP 450 mshttps://www.gonetcrm.pl// https://www.gonetcrm.pl/ — 200 — 7.5 KiB — 228 ms — http/1.1https://www.gonetcrm.pl/assets/css/style.css?v=b7f0e8d1/assets/css/style.css?v=b7f0e8d1 https://www.gonetcrm.pl/assets/css/style.css?v=b7f0e8d1 — 200 — 7.0 KiB — 57 ms — http/1.1https://www.gonetcrm.pl/assets/js/main.js?v=f263a8e9/assets/js/main.js?v=f263a8e9 https://www.gonetcrm.pl/assets/js/main.js?v=f263a8e9 — 200 — 2.8 KiB — 54 ms — http/1.1https://www.gonetcrm.pl/assets/img/logo.jpg/assets/img/logo.jpg https://www.gonetcrm.pl/assets/img/logo.jpg — 200 — 12.6 KiB — 107 ms — http/1.1https://www.gonetcrm.pl/licznik.php?p=%2F&r=&w=800&l=en-US&e=0/licznik.php?p=%2F&r=&w=800&l=en-US... https://www.gonetcrm.pl/licznik.php?p=%2F&r=&w=800&l=en-US&e=0 — 204 — 265 B — 63 ms — http/1.1https://www.gonetcrm.pl/assets/img/hero.jpg/assets/img/hero.jpg https://www.gonetcrm.pl/assets/img/hero.jpg — 200 — 88.0 KiB — 287 ms — http/1.1https://www.gonetcrm.pl/assets/img/home/40f9c569149a3b81350ac6f8e36353b3.jpg/assets/img/home/40f9c569149a3b8135... https://www.gonetcrm.pl/assets/img/home/40f9c569149a3b81350ac6f8e36353b3.jpg — 200 — 20.4 KiB — 121 ms — http/1.1https://www.gonetcrm.pl/assets/img/home/7691810e530714bc7ba72be789c070f4.jpg/assets/img/home/7691810e530714bc7b... https://www.gonetcrm.pl/assets/img/home/7691810e530714bc7ba72be789c070f4.jpg — 200 — 17.3 KiB — 141 ms — http/1.1https://www.gonetcrm.pl/favicon.ico/favicon.ico https://www.gonetcrm.pl/favicon.ico — 200 — 6.2 KiB — 53 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization
15 images, 32 KB total, 11 KB wasted
INFO

Image Optimization Audit

Total Images

15

Total Size

32 KB

Oversized

1

Wasted

11 KB

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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