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https://ztorbynauczycielki.pl

Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
95
GRADE
A
FIX
1
REVIEW
5
PASS
17
INFO
4

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

Mobile Desktop
93
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
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.

2.25 s

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

2.48 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.

4.19 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.

2.48 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
27
17 PASS 5 REVIEW 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.
Info::
ETag present — enables conditional (304) responses

No Cache-Control header

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

B
Image Optimization
7 images, 0 KB saveable
REVIEW
7 images, 0 KB saveable
Info::
All images are well-optimized
7 images 160 KB
0 oversized -0 KB
4 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
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
421 KB transferred, 14 requests
PASS
421 KB transferred, 14 requests
Info::
Page weighs 838 KB (421 KB transferred)
Info::
14 HTTP requests
Info::
Estimated 0.09 g CO2 per page load
421 KB / 2.4 MB budget
421 KB transferred
14 requests
0.09 g CO2 per page load
Fonts 177.9 KiB 42%
Images 159.7 KiB 38%
CSS 63.8 KiB 15%
HTML 16.0 KiB 4%
Other 1.6 KiB 0%
Other 1.3 KiB 0%
Other 608 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+
JS Execution Cost
455ms total JS execution
PASS
455ms total JS execution
Warning::
https://ztorbynauczycielki.pl/: 310ms CPU time
Info::
Unattributable: 145ms CPU time

Main Thread Breakdown

Other 37% Style & Layout 29% Script Evaluation 16% Parse HTML & CSS 14% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://ztorbynauczycielki.pl/310ms71ms5ms1st
Unattributable145ms7ms0ms1st
A+
Font Loading
2 fonts (178 KB)
PASS
2 fonts (178 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

178 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 2.3 s LCP 2.5 shttps://ztorbynauczycielki.pl/wp-content/themes/ashe/assets/fonts/fa-regular-400.woff2fa-regular-400.woff2 https://ztorbynauczycielki.pl/wp-content/themes/ashe/assets/fonts/fa-regular-400.woff2 — 24.9 KiB — 68 ms — font-display: swaphttps://ztorbynauczycielki.pl/wp-content/themes/ashe/assets/fonts/fa-solid-900.woff2fa-solid-900.woff2 https://ztorbynauczycielki.pl/wp-content/themes/ashe/assets/fonts/fa-solid-900.woff2 — 153.0 KiB — 113 ms — font-display: swap
fa-regular-400.woff2 woff2 swap
Size 25 KB
Load time 68 ms
Start 341 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 153 KB
Load time 113 ms
Start 341 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~76 KB and ~152 ms

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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
1
prefetch
—

1 resource hints configured

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::
`ETag` present -- conditional GET supported
A+
Page Weight Inventory
14 resources · 421 KB · 0 KB savings available
PASS
14 resources · 421 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 421 KB
Info::
3 third-party resources (0% of weight)
14 resources · 420.9 KiB · 3 third-party Within 1MB page-weight target
Font 42% · 177.9 KiB
Image 38% · 161.2 KiB
CSS 15% · 63.8 KiB
Document 4% · 17.3 KiB
Other 0% · 608 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::
3 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
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
14 requests over 1476ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 2.3 s LCP 2.5 shttps://ztorbynauczycielki.pl// https://ztorbynauczycielki.pl/ — 200 — 16.0 KiB — 214 ms — h2https://ztorbynauczycielki.pl/wp-content/litespeed/css/02f081aedfb5bbb9a3de52bf61a476b2.css?ver=1f7d6/wp-content/litespeed/css/02f081aed... https://ztorbynauczycielki.pl/wp-content/litespeed/css/02f081aedfb5bbb9a3de52bf61a476b2.css?ver=1f7d6 — 200 — 63.8 KiB — 107 ms — h2https://ztorbynauczycielki.pl/wp-content/uploads/fbrfg/site.webmanifest/wp-content/uploads/fbrfg/site.webm... https://ztorbynauczycielki.pl/wp-content/uploads/fbrfg/site.webmanifest — 200 — 608 B — 159 ms — h2data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzNzUiIGhla…data:image/svg+xml;base64,PHN2ZyB4b... data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzNzUiIGhla… — 200 — 0 B — 0 ms — datadata:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0MDAiIGhla…data:image/svg+xml;base64,PHN2ZyB4b... data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0MDAiIGhla… — 200 — 0 B — 0 ms — datadata:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzMDAiIGhla…data:image/svg+xml;base64,PHN2ZyB4b... data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzMDAiIGhla… — 200 — 0 B — 0 ms — datahttps://ztorbynauczycielki.pl/wp-content/plugins/litespeed-cache/guest.vary.php/wp-content/plugins/litespeed-cache... https://ztorbynauczycielki.pl/wp-content/plugins/litespeed-cache/guest.vary.php — 403 — 1.3 KiB — 53 ms — h2https://ztorbynauczycielki.pl/wp-content/uploads/2019/10/cropped-baner.png/wp-content/uploads/2019/10/cropped... https://ztorbynauczycielki.pl/wp-content/uploads/2019/10/cropped-baner.png — 200 — 29.9 KiB — 54 ms — h2https://ztorbynauczycielki.pl/wp-content/themes/ashe/assets/fonts/fa-regular-400.woff2/wp-content/themes/ashe/assets/font... https://ztorbynauczycielki.pl/wp-content/themes/ashe/assets/fonts/fa-regular-400.woff2 — 200 — 24.9 KiB — 68 ms — h2https://ztorbynauczycielki.pl/wp-content/themes/ashe/assets/fonts/fa-solid-900.woff2/wp-content/themes/ashe/assets/font... https://ztorbynauczycielki.pl/wp-content/themes/ashe/assets/fonts/fa-solid-900.woff2 — 200 — 153.0 KiB — 113 ms — h2https://ztorbynauczycielki.pl/wp-content/uploads/fbrfg/favicon.ico/wp-content/uploads/fbrfg/favicon.i... https://ztorbynauczycielki.pl/wp-content/uploads/fbrfg/favicon.ico — 200 — 1.6 KiB — 53 ms — h2https://ztorbynauczycielki.pl/wp-content/uploads/2019/10/logotorba.png/wp-content/uploads/2019/10/logotor... https://ztorbynauczycielki.pl/wp-content/uploads/2019/10/logotorba.png — 200 — 30.3 KiB — 54 ms — h2https://ztorbynauczycielki.pl/wp-content/uploads/2025/03/1742123130197-300x300.jpg/wp-content/uploads/2025/03/1742123... https://ztorbynauczycielki.pl/wp-content/uploads/2025/03/1742123130197-300x300.jpg — 200 — 44.2 KiB — 106 ms — h2https://ztorbynauczycielki.pl/wp-content/uploads/2025/03/1740816725296-300x300.jpg/wp-content/uploads/2025/03/1740816... https://ztorbynauczycielki.pl/wp-content/uploads/2025/03/1740816725296-300x300.jpg — 200 — 55.3 KiB — 156 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-09-25 — 2026-10-22)

LCP (p75)

795 ms

97% good

INP (p75)

53 ms

98% good

CLS (p75)

0.000

99% good

FCP (p75)

719 ms

TTFB (p75)

506 ms

This origin passes Core Web Vitals assessment
Image Optimization
10 images, 137 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

10

Total Size

137 KB

3 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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