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Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
4
REVIEW
7
PASS
12
INFO
3

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

Mobile Desktop
73
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
85
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
88
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

3.41 s

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

4.94 s

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

36 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.

4.49 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.

6.64 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
12 PASS 7 REVIEW 4 FIX
F
Page Weight Budget
Action
5.9 MB transferred, 54 requests
FIX
5.9 MB transferred, 54 requests
Critical::
Page weighs 7.8 MB (5.9 MB transferred)
Warning::
Images are 5.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.2 MB
Warning::
JavaScript is 541 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 541 KB
Info::
54 HTTP requests
Info::
Estimated 1.2 g CO2 per page load
5.9 MB / 2.4 MB budget
5.9 MB transferred
54 requests
1.2 g CO2 per page load
Images 5.2 MiB 87%
JavaScript 540.7 KiB 9%
Fonts 154.4 KiB 3%
CSS 71.2 KiB 1%
HTML 10.4 KiB 0%
Other 251 B 0%
Other 46 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (5.9 MiB of 5.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
54 resources · 5.9 MB · 0 KB savings available
FIX
54 resources · 5.9 MB · 0 KB savings available
Warning::
Page weight 5.9 MB exceeds 1 MB target by 4.9 MB
Got: 5.9 MB Expected: ≤ 1 MB
Warning::
53 third-party resources (100% of weight)
Info::
5 resources over 200KB
54 resources · 5.9 MiB · 53 third-party 4.9 MiB over 1MB target
Image 87% · 5.2 MiB
JavaScript 9% · 540.7 KiB
Font 3% · 154.4 KiB
CSS 1% · 71.2 KiB
Document 0% · 10.7 KiB
Other 0% · 46 B
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.

No Cache-Control header

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

B
Image Optimization
13 images, 0 KB saveable
REVIEW
13 images, 0 KB saveable
Warning::
https://www.autoskolanemec.cz/images/assets/logo.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
13 images 5.2 MB
0 oversized -0 KB
11 legacy format
1 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

C
JS Execution Cost
Action
1140ms total JS execution
REVIEW
1140ms total JS execution
Warning::
Unattributable: 414ms CPU time
Warning::
https://www.autoskolanemec.cz/templates/g5_helium/...: 273ms CPU time
Info::
https://www.autoskolanemec.cz/: 245ms CPU time
Info::
https://www.autoskolanemec.cz/media/vendor/jquery/...: 124ms CPU time
Info::
https://www.autoskolanemec.cz/media/gantry5/assets...: 84ms CPU time
Warning::
Third-party scripts: 726ms (64% of total)

Main Thread Breakdown

Other 40% Script Evaluation 27% Style & Layout 14% Rendering 8% Parse HTML & CSS 6% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
Unattributable414ms7ms0ms1st
https://www.autoskolanemec.cz/templates/g5_helium/custom/js/jluikit.min.js273ms120ms8ms3rd
https://www.autoskolanemec.cz/245ms8ms4ms3rd
https://www.autoskolanemec.cz/media/vendor/jquery/js/jquery.min.js?3.6.0124ms100ms8ms3rd
https://www.autoskolanemec.cz/media/gantry5/assets/js/main.js84ms71ms5ms3rd
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.
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
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+
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+
Font Loading
2 fonts (154 KB)
PASS
2 fonts (154 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

154 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 3.4 s LCP 4.9 shttps://www.autoskolanemec.cz/media/gantry5/assets/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.autoskolanemec.cz/media/gantry5/assets/webfonts/fa-solid-900.woff2 — 78.5 KiB — 54 ms — font-display: swaphttps://www.autoskolanemec.cz/media/gantry5/assets/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.autoskolanemec.cz/media/gantry5/assets/webfonts/fa-brands-400.woff2 — 75.9 KiB — 101 ms — font-display: swap
fa-solid-900.woff2 woff2 swap
Size 79 KB
Load time 54 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 76 KB
Load time 101 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
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)
A+
JS Bundles
21 scripts, 0 KB unused
PASS
21 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.autoskolanemec.cz/media/system/js/core.min.js?17121a112ecec3d656efe5c5f493429c9acf21793 KB—✓3rd
https://www.autoskolanemec.cz/media/system/js/messages.min.js?7425e8d1cb9e4f061d5e30271d6d99b0853441172 KB—✓3rd
https://www.autoskolanemec.cz/media/vendor/jquery/js/jquery.min.js?3.6.031 KB—✓3rd
https://www.autoskolanemec.cz/templates/g5_helium/custom/js/jluikit.min.js28 KB—✓3rd
https://www.autoskolanemec.cz/media/gantry5/assets/js/main.js17 KB—✓3rd
https://www.autoskolanemec.cz/plugins/system/gdpr/assets/js/jquery.fancybox.min.js?e5d29c0557269a8c5fbd07ac159388b419 KB—✓3rd
https://www.autoskolanemec.cz/plugins/system/gdpr/assets/js/cookieconsent.min.js?e5d29c0557269a8c5fbd07ac159388b413 KB—✓3rd
https://www.autoskolanemec.cz/plugins/system/gdpr/assets/js/init.js?e5d29c0557269a8c5fbd07ac159388b46 KB—✓3rd
https://maps.gstatic.com/maps-api-v3/embed/js/65/6a/intl/cs_ALL/init_embed.js74 KB—✓3rd
https://maps.googleapis.com/maps/api/js?key=AIzaSyCmL18misQw9KdwqGaw3zHkitj8vG6QF2Y&paint_origin=&libraries=geometry,search&v=weekly&loading=async&language=cs&region=cz&experimentation=allowed&callback=onApiLoad3 KB—✓3rd
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
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
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::
4 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
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
13 render-blocking stylesheet(s) -- recommended: <=3
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
Network Waterfall
54 requests over 2261ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 3.4 s LCP 4.9 shttps://autoskolanemec.cz// https://autoskolanemec.cz/ — 301 — 251 B — 146 ms — http/1.1https://www.autoskolanemec.cz/www.autoskolanemec.cz/ https://www.autoskolanemec.cz/ — 200 — 9.0 KiB — 929 ms — http/1.1https://www.autoskolanemec.cz/media/vendor/joomla-custom-elements/css/joomla-alert.min.css?0.2.0www.autoskolanemec.cz/media/vendor/... https://www.autoskolanemec.cz/media/vendor/joomla-custom-elements/css/joomla-alert.min.css?0.2.0 — 200 — 1.3 KiB — 46 ms — http/1.1https://www.autoskolanemec.cz/plugins/system/gdpr/assets/css/cookieconsent.min.css?e5d29c0557269a8c5fbd07ac159388b4www.autoskolanemec.cz/plugins/syste... https://www.autoskolanemec.cz/plugins/system/gdpr/assets/css/cookieconsent.min.css?e5d29c0557269a8c5fbd07ac159388b4 — 503 — 174 B — 93 ms — http/1.1https://www.autoskolanemec.cz/plugins/system/gdpr/assets/css/jquery.fancybox.min.css?e5d29c0557269a8c5fbd07ac159388b4www.autoskolanemec.cz/plugins/syste... https://www.autoskolanemec.cz/plugins/system/gdpr/assets/css/jquery.fancybox.min.css?e5d29c0557269a8c5fbd07ac159388b4 — 503 — 174 B — 137 ms — http/1.1https://www.autoskolanemec.cz/plugins/system/jce/css/content.css?badb4208be409b1335b815dde676300ewww.autoskolanemec.cz/plugins/syste... https://www.autoskolanemec.cz/plugins/system/jce/css/content.css?badb4208be409b1335b815dde676300e — 503 — 174 B — 138 ms — http/1.1https://www.autoskolanemec.cz/templates/g5_helium/custom/css/jluikit.min.csswww.autoskolanemec.cz/templates/g5_... https://www.autoskolanemec.cz/templates/g5_helium/custom/css/jluikit.min.css — 503 — 174 B — 143 ms — http/1.1https://www.autoskolanemec.cz/media/gantry5/engines/nucleus/css-compiled/nucleus.csswww.autoskolanemec.cz/media/gantry5... https://www.autoskolanemec.cz/media/gantry5/engines/nucleus/css-compiled/nucleus.css — 503 — 174 B — 146 ms — http/1.1https://www.autoskolanemec.cz/templates/g5_helium/custom/css-compiled/helium_13.csswww.autoskolanemec.cz/templates/g5_... https://www.autoskolanemec.cz/templates/g5_helium/custom/css-compiled/helium_13.css — 503 — 174 B — 143 ms — http/1.1https://www.autoskolanemec.cz/media/gantry5/engines/nucleus/css-compiled/bootstrap5.csswww.autoskolanemec.cz/media/gantry5... https://www.autoskolanemec.cz/media/gantry5/engines/nucleus/css-compiled/bootstrap5.css — 200 — 23.7 KiB — 281 ms — http/1.1https://www.autoskolanemec.cz/media/system/css/joomla-fontawesome.min.csswww.autoskolanemec.cz/media/system/... https://www.autoskolanemec.cz/media/system/css/joomla-fontawesome.min.css — 200 — 15.6 KiB — 318 ms — http/1.1https://www.autoskolanemec.cz/media/gantry5/assets/css/font-awesome5-all.min.csswww.autoskolanemec.cz/media/gantry5... https://www.autoskolanemec.cz/media/gantry5/assets/css/font-awesome5-all.min.css — 200 — 12.8 KiB — 314 ms — http/1.1https://www.autoskolanemec.cz/media/gantry5/assets/css/font-awesome5-shim.min.csswww.autoskolanemec.cz/media/gantry5... https://www.autoskolanemec.cz/media/gantry5/assets/css/font-awesome5-shim.min.css — 200 — 4.5 KiB — 283 ms — http/1.1https://www.autoskolanemec.cz/templates/g5_helium/custom/css-compiled/helium-joomla_13.csswww.autoskolanemec.cz/templates/g5_... https://www.autoskolanemec.cz/templates/g5_helium/custom/css-compiled/helium-joomla_13.css — 200 — 7.2 KiB — 286 ms — http/1.1https://www.autoskolanemec.cz/templates/g5_helium/custom/css-compiled/custom_13.csswww.autoskolanemec.cz/templates/g5_... https://www.autoskolanemec.cz/templates/g5_helium/custom/css-compiled/custom_13.css — 200 — 5.2 KiB — 287 ms — http/1.1https://www.autoskolanemec.cz/media/system/js/core.min.js?17121a112ecec3d656efe5c5f493429c9acf2179www.autoskolanemec.cz/media/system/... https://www.autoskolanemec.cz/media/system/js/core.min.js?17121a112ecec3d656efe5c5f493429c9acf2179 — 200 — 3.3 KiB — 320 ms — http/1.1https://www.autoskolanemec.cz/media/system/js/messages.min.js?7425e8d1cb9e4f061d5e30271d6d99b085344117www.autoskolanemec.cz/media/system/... https://www.autoskolanemec.cz/media/system/js/messages.min.js?7425e8d1cb9e4f061d5e30271d6d99b085344117 — 200 — 2.0 KiB — 324 ms — http/1.1https://www.autoskolanemec.cz/media/vendor/jquery/js/jquery.min.js?3.6.0www.autoskolanemec.cz/media/vendor/... https://www.autoskolanemec.cz/media/vendor/jquery/js/jquery.min.js?3.6.0 — 200 — 30.5 KiB — 371 ms — http/1.1https://www.autoskolanemec.cz/templates/g5_helium/custom/js/jluikit.min.jswww.autoskolanemec.cz/templates/g5_... https://www.autoskolanemec.cz/templates/g5_helium/custom/js/jluikit.min.js — 200 — 28.4 KiB — 372 ms — http/1.1https://www.autoskolanemec.cz/images/assets/logo.pngwww.autoskolanemec.cz/images/assets... https://www.autoskolanemec.cz/images/assets/logo.png — 200 — 25.4 KiB — 43 ms — http/1.1https://www.autoskolanemec.cz/images/assets/autoheader.pngwww.autoskolanemec.cz/images/assets... https://www.autoskolanemec.cz/images/assets/autoheader.png — 200 — 182.1 KiB — 121 ms — http/1.1https://www.autoskolanemec.cz/images/assets/budova.jpgwww.autoskolanemec.cz/images/assets... https://www.autoskolanemec.cz/images/assets/budova.jpg — 200 — 26.8 KiB — 41 ms — http/1.1https://www.autoskolanemec.cz/images/assets/photo1.pngwww.autoskolanemec.cz/images/assets... https://www.autoskolanemec.cz/images/assets/photo1.png — 200 — 1.0 MiB — 231 ms — http/1.1https://www.autoskolanemec.cz/images/assets/photo2.pngwww.autoskolanemec.cz/images/assets... https://www.autoskolanemec.cz/images/assets/photo2.png — 200 — 1.0 MiB — 218 ms — http/1.1https://www.autoskolanemec.cz/media/gantry5/assets/js/main.jswww.autoskolanemec.cz/media/gantry5... https://www.autoskolanemec.cz/media/gantry5/assets/js/main.js — 200 — 16.6 KiB — 53 ms — http/1.1https://www.autoskolanemec.cz/plugins/system/gdpr/assets/js/jquery.fancybox.min.js?e5d29c0557269a8c5fbd07ac159388b4www.autoskolanemec.cz/plugins/syste... https://www.autoskolanemec.cz/plugins/system/gdpr/assets/js/jquery.fancybox.min.js?e5d29c0557269a8c5fbd07ac159388b4 — 200 — 19.5 KiB — 84 ms — http/1.1https://www.autoskolanemec.cz/plugins/system/gdpr/assets/js/cookieconsent.min.js?e5d29c0557269a8c5fbd07ac159388b4www.autoskolanemec.cz/plugins/syste... https://www.autoskolanemec.cz/plugins/system/gdpr/assets/js/cookieconsent.min.js?e5d29c0557269a8c5fbd07ac159388b4 — 200 — 13.3 KiB — 54 ms — http/1.1https://autoskolanemec-cz.svethostingu-tmp.cz/images/assets/Rectangle%202.pngautoskolanemec-cz.svethostingu-tmp.... https://autoskolanemec-cz.svethostingu-tmp.cz/images/assets/Rectangle%202.png — -1 — 0 B — 263 ms — https://www.autoskolanemec.cz/images/assets/background.pngwww.autoskolanemec.cz/images/assets... https://www.autoskolanemec.cz/images/assets/background.png — 200 — 1.6 MiB — 266 ms — http/1.1https://www.autoskolanemec.cz/media/gantry5/assets/webfonts/fa-solid-900.woff2www.autoskolanemec.cz/media/gantry5... https://www.autoskolanemec.cz/media/gantry5/assets/webfonts/fa-solid-900.woff2 — 200 — 78.5 KiB — 54 ms — http/1.1
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 3.4 s LCP 4.9 shttps://autoskolanemec.cz// https://autoskolanemec.cz/ — 301 — 251 B — 146 ms — http/1.1https://www.autoskolanemec.cz/www.autoskolanemec.cz/ https://www.autoskolanemec.cz/ — 200 — 9.0 KiB — 929 ms — http/1.1https://www.autoskolanemec.cz/media/vendor/joomla-custom-elements/css/joomla-alert.min.css?0.2.0www.autoskolanemec.cz/media/vendor/... https://www.autoskolanemec.cz/media/vendor/joomla-custom-elements/css/joomla-alert.min.css?0.2.0 — 200 — 1.3 KiB — 46 ms — http/1.1https://www.autoskolanemec.cz/plugins/system/gdpr/assets/css/cookieconsent.min.css?e5d29c0557269a8c5fbd07ac159388b4www.autoskolanemec.cz/plugins/syste... https://www.autoskolanemec.cz/plugins/system/gdpr/assets/css/cookieconsent.min.css?e5d29c0557269a8c5fbd07ac159388b4 — 503 — 174 B — 93 ms — http/1.1https://www.autoskolanemec.cz/plugins/system/gdpr/assets/css/jquery.fancybox.min.css?e5d29c0557269a8c5fbd07ac159388b4www.autoskolanemec.cz/plugins/syste... https://www.autoskolanemec.cz/plugins/system/gdpr/assets/css/jquery.fancybox.min.css?e5d29c0557269a8c5fbd07ac159388b4 — 503 — 174 B — 137 ms — http/1.1https://www.autoskolanemec.cz/plugins/system/jce/css/content.css?badb4208be409b1335b815dde676300ewww.autoskolanemec.cz/plugins/syste... https://www.autoskolanemec.cz/plugins/system/jce/css/content.css?badb4208be409b1335b815dde676300e — 503 — 174 B — 138 ms — http/1.1https://www.autoskolanemec.cz/templates/g5_helium/custom/css/jluikit.min.csswww.autoskolanemec.cz/templates/g5_... https://www.autoskolanemec.cz/templates/g5_helium/custom/css/jluikit.min.css — 503 — 174 B — 143 ms — http/1.1https://www.autoskolanemec.cz/media/gantry5/engines/nucleus/css-compiled/nucleus.csswww.autoskolanemec.cz/media/gantry5... https://www.autoskolanemec.cz/media/gantry5/engines/nucleus/css-compiled/nucleus.css — 503 — 174 B — 146 ms — 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datahttps://maps.googleapis.com/maps/api/js/StaticMapService.GetMapImage?1m2&1i9063296&2i5763501&2e1&3u16&4m2&1u396&2u400&5m6&1e0&5scs&6scz&10b1&12b1&14i47083502&8e1&key=AIzaSyCmL18misQw9KdwqGaw3zHkitj8vG6QF2Y&token=26929maps.googleapis.com/maps/api/js/Sta... https://maps.googleapis.com/maps/api/js/StaticMapService.GetMapImage?1m2&1i9063296&2i5763501&2e1&3u16&4m2&1u396&2u400&5m6&1e0&5scs&6scz&10b1&12b1&14i47083502&8e1&key=AIzaSyCmL18misQw9KdwqGaw3zHkitj8vG6QF2Y&token=26929 — 200 — 24.7 KiB — 112 ms — h3https://maps.googleapis.com/maps-api-v3/api/js/65/6a/intl/cs_ALL/onion.jsmaps.googleapis.com/maps-api-v3/api... https://maps.googleapis.com/maps-api-v3/api/js/65/6a/intl/cs_ALL/onion.js — 200 — 9.9 KiB — 35 ms — h3https://maps.googleapis.com/maps-api-v3/api/js/65/6a/intl/cs_ALL/search_impl.jsmaps.googleapis.com/maps-api-v3/api... https://maps.googleapis.com/maps-api-v3/api/js/65/6a/intl/cs_ALL/search_impl.js — 200 — 1.3 KiB — 34 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
64% of JavaScript execution is third-party
First-party Third-party 726ms · 85KB · Kč90/mo
www.autoskolanemec.cz
Other
Costly
Execution 273ms
Transfer 28 KB
Monthly Cost Kč34/mo
www.autoskolanemec.cz
Other
Costly
Execution 245ms
Transfer 9 KB
Monthly Cost Kč30/mo
www.autoskolanemec.cz
Other
Optional
Execution 124ms
Transfer 31 KB
Monthly Cost Kč15/mo
www.autoskolanemec.cz
Other
Optional
Execution 84ms
Transfer 17 KB
Monthly Cost Kč10/mo

These scripts may cost more than they're worth

  • www.autoskolanemec.cz adds 273ms and costs ~Kč34/month
  • www.autoskolanemec.cz adds 245ms and costs ~Kč30/month

64% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

www.autoskolanemec.cz takes 273ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.autoskolanemec.cz takes 245ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

Image Optimization
11 images, 3998 KB total, 3278 KB wasted
INFO

Image Optimization Audit

Total Images

11

Total Size

3998 KB

Oversized

6

Wasted

3278 KB

1 missing dimensions 8 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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