Skip to content
https://smart-network.cz

Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
4
REVIEW
7
PASS
12
INFO
3

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

Mobile Desktop
57
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
84
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.
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.

2.41 s

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

9.66 s

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

396 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.

5.90 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.

9.85 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
2.8 MB transferred, 42 requests
FIX
2.8 MB transferred, 42 requests
Warning::
Page weighs 3.3 MB (2.8 MB transferred)
Warning::
Images are 2.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.4 MB
Info::
42 HTTP requests
Info::
Estimated 0.58 g CO2 per page load
2.8 MB / 2.4 MB budget
2.8 MB transferred
42 requests
0.58 g CO2 per page load
Images 2.4 MiB 86%
JavaScript 182.5 KiB 6%
Fonts 156.9 KiB 6%
CSS 24.7 KiB 1%
HTML 18.9 KiB 1%
Other 2.5 KiB 0%
Other 43 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

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 (2.8 MiB of 2.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
42 resources · 2.8 MB · 62 KB savings available
FIX
42 resources · 2.8 MB · 62 KB savings available
Warning::
Page weight 2.8 MB exceeds 1 MB target by 1.8 MB
Got: 2.8 MB Expected: ≤ 1 MB
Info::
~62 KB of savings available
Warning::
41 third-party resources (100% of weight)
Info::
4 resources over 200KB
42 resources · 2.8 MiB · 41 third-party 1.8 MiB over 1MB target
Image 86% · 2.4 MiB
JavaScript 6% · 182.5 KiB
Font 6% · 156.9 KiB
CSS 1% · 24.7 KiB
Document 1% · 18.9 KiB
Other 0% · 448 B

~62.0 KiB of savings available

Remove unused JavaScript: 62.0 KiB
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.

C
Image Optimization
Action
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.smart-network.cz/frontend/dist/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.smart-network.cz/frontend/dist/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.smart-network.cz/frontend/dist/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
23 images 2.4 MB
0 oversized -0 KB
11 legacy format
4 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

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

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
1917ms total JS execution
REVIEW
1917ms total JS execution
Warning::
Unattributable: 655ms CPU time
Warning::
https://www.smart-network.cz/frontend/dist/assets/...: 589ms CPU time
Info::
https://www.smart-network.cz/: 240ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=AW-171...: 228ms CPU time
Info::
https://www.smart-network.cz/frontend/dist/assets/...: 205ms CPU time
Warning::
Third-party scripts: 1262ms (66% of total)

Main Thread Breakdown

Style & Layout 40% Other 37% Script Evaluation 17%
ScriptTotalScriptingParse/CompileParty
Unattributable655ms9ms0ms1st
https://www.smart-network.cz/frontend/dist/assets/splide-B8WRMK72.js589ms70ms0ms3rd
https://www.smart-network.cz/240ms29ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-17119434581228ms193ms33ms3rd
https://www.smart-network.cz/frontend/dist/assets/headspace-D57y36bR.js205ms2ms0ms3rd
B
JS Bundles
7 scripts, 62 KB unused
REVIEW
7 scripts, 62 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-171...: 62 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 62 KB
62 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=AW-17119434581155 KB62 KB (40%)✓3rd
https://www.smart-network.cz/frontend/dist/assets/main-Bu2HLLOY.js1 KB—✓3rd
https://www.smart-network.cz/frontend/dist/assets/headspace-D57y36bR.js1 KB—✓3rd
https://www.smart-network.cz/frontend/dist/assets/splide-B8WRMK72.js14 KB—✓3rd
https://www.smart-network.cz/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js1 KB—✓3rd
https://www.smart-network.cz/smart-app-banner.js?v=210 KB—✓3rd
https://cookiehub.net/c2/cdf2706d.js0 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

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.
B
CSS Performance Depth
2 CSS depth issue(s) detected
REVIEW
2 CSS depth issue(s) detected
Warning::
4 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.
Warning::
2 `@font-face` rule(s) without `font-display` -- causes FOIT
An `@font-face` rule without `font-display` causes Flash of Invisible Text (FOIT): the browser hides the styled text for up to 3 seconds while the custom font downloads, then either swaps to fallback (Chrome / Firefox) or stays invisible (older Safari). Add `font-display: swap` (shows fallback immediately, swaps in the custom font when ready) or `font-display: optional` (uses fallback if the font isn't ready in 100ms; never causes visible swap). Either eliminates FOIT outright.
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
4 fonts (157 KB)
PASS
4 fonts (157 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

157 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 2.4 s LCP 9.7 shttps://www.smart-network.cz/frontend/dist/assets/Gilroy-Regular-DSXAYGo9.woff2Gilroy-Regular-DSXAYGo9... https://www.smart-network.cz/frontend/dist/assets/Gilroy-Regular-DSXAYGo9.woff2 — 43.9 KiB — 198 ms — font-display: swaphttps://www.smart-network.cz/frontend/dist/assets/Gilroy-ExtraBold-3Oes9p1A.woff2Gilroy-ExtraBold-3Oes9p... https://www.smart-network.cz/frontend/dist/assets/Gilroy-ExtraBold-3Oes9p1A.woff2 — 41.8 KiB — 175 ms — font-display: swaphttps://www.smart-network.cz/frontend/dist/assets/Gilroy-Bold-BzGepy1p.woff2Gilroy-Bold-BzGepy1p.woff2 https://www.smart-network.cz/frontend/dist/assets/Gilroy-Bold-BzGepy1p.woff2 — 44.2 KiB — 194 ms — font-display: swaphttps://www.smart-network.cz/frontend/dist/assets/Gilroy-Semibold-DvlKZn4h.woff2Gilroy-Semibold-DvlKZn4... https://www.smart-network.cz/frontend/dist/assets/Gilroy-Semibold-DvlKZn4h.woff2 — 27.0 KiB — 166 ms — font-display: swap
Gilroy-Regular-DSXAYGo9... woff2 swap
Size 44 KB
Load time 198 ms
Start 325 ms
Risk FOUT — text flashes from fallback to web font
Gilroy-ExtraBold-3Oes9p... woff2 swap
Size 42 KB
Load time 175 ms
Start 326 ms
Risk FOUT — text flashes from fallback to web font
Gilroy-Bold-BzGepy1p.woff2 woff2 swap
Size 44 KB
Load time 194 ms
Start 566 ms
Risk FOUT — text flashes from fallback to web font
Gilroy-Semibold-DvlKZn4... woff2 swap
Size 27 KB
Load time 166 ms
Start 569 ms
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+
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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
—
preload
3
dns-prefetch
—
prefetch
—

3 resource hints configured

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+
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
No render-blocking JS or document.write usage detected
PASS
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
42 requests over 1679ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 2.4 s LCP 9.7 shttps://smart-network.cz// https://smart-network.cz/ — 301 — 427 B — 156 ms — h2https://www.smart-network.cz/www.smart-network.cz/ https://www.smart-network.cz/ — 200 — 18.9 KiB — 156 ms — h2https://www.smart-network.cz/frontend/dist/assets/Gilroy-Regular-DSXAYGo9.woff2www.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/Gilroy-Regular-DSXAYGo9.woff2 — 200 — 43.9 KiB — 198 ms — h2https://www.smart-network.cz/frontend/dist/assets/Gilroy-ExtraBold-3Oes9p1A.woff2www.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/Gilroy-ExtraBold-3Oes9p1A.woff2 — 200 — 41.8 KiB — 175 ms — h2https://www.smart-network.cz/frontend/dist/assets/hero-bg-jQfSKMBr.avifwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/hero-bg-jQfSKMBr.avif — 200 — 46.9 KiB — 227 ms — h2https://www.smart-network.cz/frontend/dist/assets/style-C1dh612o.csswww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/style-C1dh612o.css — 200 — 20.8 KiB — 175 ms — h2https://www.smart-network.cz/frontend/dist/assets/headspace-uhz7taDT.csswww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/headspace-uhz7taDT.css — 200 — 561 B — 132 ms — h2https://www.smart-network.cz/frontend/dist/assets/splide-CUIoNJ2e.csswww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/splide-CUIoNJ2e.css — 200 — 1.7 KiB — 146 ms — h2https://www.smart-network.cz/frontend/dist/assets/main-Bu2HLLOY.jswww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/main-Bu2HLLOY.js — 200 — 1.1 KiB — 30 ms — h2https://www.smart-network.cz/frontend/dist/assets/headspace-D57y36bR.jswww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/headspace-D57y36bR.js — 200 — 978 B — 28 ms — h2https://www.smart-network.cz/frontend/dist/assets/splide-B8WRMK72.jswww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/splide-B8WRMK72.js — 200 — 13.9 KiB — 33 ms — h2https://www.smart-network.cz/frontend/dist/assets/logo-white-Css5C56A.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/logo-white-Css5C56A.svg — 200 — 11.0 KiB — 149 ms — h2https://www.smart-network.cz/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.jswww.smart-network.cz/cdn-cgi/script... https://www.smart-network.cz/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js — 200 — 1003 B — 23 ms — h2https://www.smart-network.cz/frontend/dist/assets/hero-lines-B5Tneext.avifwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/hero-lines-B5Tneext.avif — 200 — 220.2 KiB — 257 ms — h2https://www.smart-network.cz/smart-app-banner.csswww.smart-network.cz/smart-app-bann... https://www.smart-network.cz/smart-app-banner.css — 200 — 1.7 KiB — 130 ms — h2https://www.googletagmanager.com/gtag/js?id=AW-17119434581www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-17119434581 — 200 — 155.1 KiB — 181 ms — h2https://www.smart-network.cz/smart-app-banner.js?v=2www.smart-network.cz/smart-app-bann... https://www.smart-network.cz/smart-app-banner.js?v=2 — 200 — 10.5 KiB — 138 ms — h3https://www.smart-network.cz/frontend/dist/assets/page-bg-01-CtaUaN1i.avifwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/page-bg-01-CtaUaN1i.avif — 200 — 93.8 KiB — 243 ms — h3https://www.smart-network.cz/frontend/dist/assets/stats-bg-99BLgbUd.avifwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/stats-bg-99BLgbUd.avif — 200 — 118.6 KiB — 289 ms — h3https://www.smart-network.cz/frontend/dist/assets/lines-bg-BO9fLAYD.avifwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/lines-bg-BO9fLAYD.avif — 200 — 340.3 KiB — 604 ms — h3https://www.smart-network.cz/frontend/dist/assets/footer-bg-CqCKHiCE.webpwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/footer-bg-CqCKHiCE.webp — 200 — 246.2 KiB — 356 ms — h3https://www.smart-network.cz/frontend/dist/assets/chevron-right-C63eCDQy.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/chevron-right-C63eCDQy.svg — 200 — 964 B — 142 ms — h3https://www.smart-network.cz/frontend/dist/assets/Gilroy-Bold-BzGepy1p.woff2www.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/Gilroy-Bold-BzGepy1p.woff2 — 200 — 44.2 KiB — 194 ms — h3https://www.smart-network.cz/frontend/dist/assets/Gilroy-Semibold-DvlKZn4h.woff2www.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/Gilroy-Semibold-DvlKZn4h.woff2 — 200 — 27.0 KiB — 166 ms — h3https://www.smart-network.cz/frontend/dist/assets/type-focus-DvQ6PcIt.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/type-focus-DvQ6PcIt.svg — 200 — 3.6 KiB — 141 ms — h3https://www.smart-network.cz/frontend/dist/assets/type-edu-CXeH9gap.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/type-edu-CXeH9gap.svg — 200 — 3.5 KiB — 144 ms — h3https://www.smart-network.cz/frontend/dist/assets/type-mix-C13FL8dy.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/type-mix-C13FL8dy.svg — 200 — 6.4 KiB — 144 ms — h3https://www.smart-network.cz/frontend/dist/assets/type-b2b-vo93uu3V.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/type-b2b-vo93uu3V.svg — 200 — 6.4 KiB — 140 ms — h3https://www.smart-network.cz/filestorage/action/0/000/001/0000001508.webp?cache=7de9dd31b969www.smart-network.cz/filestorage/ac... https://www.smart-network.cz/filestorage/action/0/000/001/0000001508.webp?cache=7de9dd31b969 — 200 — 71.1 KiB — 220 ms — h3https://www.smart-network.cz/frontend/dist/assets/icon-location-ePfXzVLp.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/icon-location-ePfXzVLp.svg — 200 — 974 B — 127 ms — h3
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 2.4 s LCP 9.7 shttps://smart-network.cz// https://smart-network.cz/ — 301 — 427 B — 156 ms — h2https://www.smart-network.cz/www.smart-network.cz/ https://www.smart-network.cz/ — 200 — 18.9 KiB — 156 ms — h2https://www.smart-network.cz/frontend/dist/assets/Gilroy-Regular-DSXAYGo9.woff2www.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/Gilroy-Regular-DSXAYGo9.woff2 — 200 — 43.9 KiB — 198 ms — h2https://www.smart-network.cz/frontend/dist/assets/Gilroy-ExtraBold-3Oes9p1A.woff2www.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/Gilroy-ExtraBold-3Oes9p1A.woff2 — 200 — 41.8 KiB — 175 ms — h2https://www.smart-network.cz/frontend/dist/assets/hero-bg-jQfSKMBr.avifwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/hero-bg-jQfSKMBr.avif — 200 — 46.9 KiB — 227 ms — h2https://www.smart-network.cz/frontend/dist/assets/style-C1dh612o.csswww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/style-C1dh612o.css — 200 — 20.8 KiB — 175 ms — h2https://www.smart-network.cz/frontend/dist/assets/headspace-uhz7taDT.csswww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/headspace-uhz7taDT.css — 200 — 561 B — 132 ms — h2https://www.smart-network.cz/frontend/dist/assets/splide-CUIoNJ2e.csswww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/splide-CUIoNJ2e.css — 200 — 1.7 KiB — 146 ms — h2https://www.smart-network.cz/frontend/dist/assets/main-Bu2HLLOY.jswww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/main-Bu2HLLOY.js — 200 — 1.1 KiB — 30 ms — h2https://www.smart-network.cz/frontend/dist/assets/headspace-D57y36bR.jswww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/headspace-D57y36bR.js — 200 — 978 B — 28 ms — h2https://www.smart-network.cz/frontend/dist/assets/splide-B8WRMK72.jswww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/splide-B8WRMK72.js — 200 — 13.9 KiB — 33 ms — h2https://www.smart-network.cz/frontend/dist/assets/logo-white-Css5C56A.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/logo-white-Css5C56A.svg — 200 — 11.0 KiB — 149 ms — h2https://www.smart-network.cz/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.jswww.smart-network.cz/cdn-cgi/script... https://www.smart-network.cz/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js — 200 — 1003 B — 23 ms — h2https://www.smart-network.cz/frontend/dist/assets/hero-lines-B5Tneext.avifwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/hero-lines-B5Tneext.avif — 200 — 220.2 KiB — 257 ms — h2https://www.smart-network.cz/smart-app-banner.csswww.smart-network.cz/smart-app-bann... https://www.smart-network.cz/smart-app-banner.css — 200 — 1.7 KiB — 130 ms — h2https://www.googletagmanager.com/gtag/js?id=AW-17119434581www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-17119434581 — 200 — 155.1 KiB — 181 ms — h2https://www.smart-network.cz/smart-app-banner.js?v=2www.smart-network.cz/smart-app-bann... https://www.smart-network.cz/smart-app-banner.js?v=2 — 200 — 10.5 KiB — 138 ms — h3https://www.smart-network.cz/frontend/dist/assets/page-bg-01-CtaUaN1i.avifwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/page-bg-01-CtaUaN1i.avif — 200 — 93.8 KiB — 243 ms — h3https://www.smart-network.cz/frontend/dist/assets/stats-bg-99BLgbUd.avifwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/stats-bg-99BLgbUd.avif — 200 — 118.6 KiB — 289 ms — h3https://www.smart-network.cz/frontend/dist/assets/lines-bg-BO9fLAYD.avifwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/lines-bg-BO9fLAYD.avif — 200 — 340.3 KiB — 604 ms — h3https://www.smart-network.cz/frontend/dist/assets/footer-bg-CqCKHiCE.webpwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/footer-bg-CqCKHiCE.webp — 200 — 246.2 KiB — 356 ms — h3https://www.smart-network.cz/frontend/dist/assets/chevron-right-C63eCDQy.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/chevron-right-C63eCDQy.svg — 200 — 964 B — 142 ms — h3https://www.smart-network.cz/frontend/dist/assets/Gilroy-Bold-BzGepy1p.woff2www.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/Gilroy-Bold-BzGepy1p.woff2 — 200 — 44.2 KiB — 194 ms — h3https://www.smart-network.cz/frontend/dist/assets/Gilroy-Semibold-DvlKZn4h.woff2www.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/Gilroy-Semibold-DvlKZn4h.woff2 — 200 — 27.0 KiB — 166 ms — h3https://www.smart-network.cz/frontend/dist/assets/type-focus-DvQ6PcIt.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/type-focus-DvQ6PcIt.svg — 200 — 3.6 KiB — 141 ms — h3https://www.smart-network.cz/frontend/dist/assets/type-edu-CXeH9gap.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/type-edu-CXeH9gap.svg — 200 — 3.5 KiB — 144 ms — h3https://www.smart-network.cz/frontend/dist/assets/type-mix-C13FL8dy.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/type-mix-C13FL8dy.svg — 200 — 6.4 KiB — 144 ms — h3https://www.smart-network.cz/frontend/dist/assets/type-b2b-vo93uu3V.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/type-b2b-vo93uu3V.svg — 200 — 6.4 KiB — 140 ms — h3https://www.smart-network.cz/filestorage/action/0/000/001/0000001508.webp?cache=7de9dd31b969www.smart-network.cz/filestorage/ac... https://www.smart-network.cz/filestorage/action/0/000/001/0000001508.webp?cache=7de9dd31b969 — 200 — 71.1 KiB — 220 ms — h3https://www.smart-network.cz/frontend/dist/assets/icon-location-ePfXzVLp.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/icon-location-ePfXzVLp.svg — 200 — 974 B — 127 ms — h3https://www.smart-network.cz/frontend/dist/assets/icon-calendar-Dv0yU-DW.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/icon-calendar-Dv0yU-DW.svg — 200 — 998 B — 125 ms — h3https://www.smart-network.cz/filestorage/action/0/000/001/0000001502.webp?cache=053cc2b2e671www.smart-network.cz/filestorage/ac... https://www.smart-network.cz/filestorage/action/0/000/001/0000001502.webp?cache=053cc2b2e671 — 200 — 179.0 KiB — 334 ms — h3https://www.smart-network.cz/filestorage/action/0/000/001/0000001511.webp?cache=6a8c0d8ae5e90www.smart-network.cz/filestorage/ac... https://www.smart-network.cz/filestorage/action/0/000/001/0000001511.webp?cache=6a8c0d8ae5e90 — 200 — 897.4 KiB — 605 ms — h3https://www.smart-network.cz/filestorage/action/0/000/001/0000001510.webp?cache=167d3e86f3b6www.smart-network.cz/filestorage/ac... https://www.smart-network.cz/filestorage/action/0/000/001/0000001510.webp?cache=167d3e86f3b6 — 200 — 59.9 KiB — 200 ms — h3https://www.google.com/ccm/collect?rcb=1&frm=0&apvc=1&auid=324191595.1787612552&dt=%C3%9Avod%20%7C%20Smart%20Network&tid=AW-17119434581&en=page_view&dl=https%3A%2F%2Fwww.smart-network.cz%2F&scrsrc=www.googletagmanager.com&rnd=7136984.1787612552&navt=n&npa=1&gtm=45be68l1v9222657056za200zd9222657056xec&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=115938465~115938468~117227715~118897920~118897930~119367802~119367810~120385422&tft=1787612552186&tfd=852&tids=AW-17119434581&fmt=8www.google.com/ccm/collect?rcb=1&fr... https://www.google.com/ccm/collect?rcb=1&frm=0&apvc=1&auid=324191595.1787612552&dt=%C3%9Avod%20%7C%20Smart%20Network&tid=AW-17119434581&en=page_view&dl=https%3A%2F%2Fwww.smart-network.cz%2F&scrsrc=www.googletagmanager.com&rnd=7136984.1787612552&navt=n&npa=1&gtm=45be68l1v9222657056za200zd9222657056xec&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=115938465~115938468~117227715~118897920~118897930~119367802~119367810~120385422&tft=1787612552186&tfd=852&tids=AW-17119434581&fmt=8 — 200 — 21 B — 61 ms — h3https://ad.doubleclick.net/ccm/s/collect?auid=324191595.1787612552&gtm=45be68l1v9222657056za200zd9222657056xec&fmt=8ad.doubleclick.net/ccm/s/collect?au... https://ad.doubleclick.net/ccm/s/collect?auid=324191595.1787612552&gtm=45be68l1v9222657056za200zd9222657056xec&fmt=8 — 204 — 22 B — 71 ms — h3https://cookiehub.net/c2/cdf2706d.jscookiehub.net/c2/cdf2706d.js https://cookiehub.net/c2/cdf2706d.js — -1 — 0 B — 327 ms — data:image/gif;base64,R0lGODlhCAAIAIABAFVVVf///yH5BAEHAAEALAAAAAAIAAgAAAINRG4XudroGJBRsYcxKAA7data:image/gif;base64,R0lGODlhCAAIA... data:image/gif;base64,R0lGODlhCAAIAIABAFVVVf///yH5BAEHAAEALAAAAAAIAAgAAAINRG4XudroGJBRsYcxKAA7 — 200 — 0 B — 0 ms — datahttps://www.smart-network.cz/frontend-design/img/favicon/android-icon-144x144.pngwww.smart-network.cz/frontend-desig... https://www.smart-network.cz/frontend-design/img/favicon/android-icon-144x144.png — 200 — 15.6 KiB — 128 ms — h3https://www.smart-network.cz/favicon.icowww.smart-network.cz/favicon.ico https://www.smart-network.cz/favicon.ico — 200 — 2.1 KiB — 22 ms — h3https://i.ytimg.com/vi/20awQjEZuLE/maxresdefault.jpgi.ytimg.com/vi/20awQjEZuLE/maxresde... https://i.ytimg.com/vi/20awQjEZuLE/maxresdefault.jpg — 200 — 124.1 KiB — 169 ms — h2https://www.smart-network.cz/frontend/dist/assets/icon-play-video-BMQB7lv-.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/icon-play-video-BMQB7lv-.svg — 200 — 861 B — 120 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
66% of JavaScript execution is third-party
First-party Third-party 1262ms · 189KB · Kč507/mo
www.smart-network.cz
Other
Costly
Execution 589ms
Transfer 14 KB
Monthly Cost Kč237/mo
www.smart-network.cz
Other
Costly
Execution 240ms
Transfer 19 KB
Monthly Cost Kč97/mo
Google Tag Manager
Tag Manager
Costly
Execution 228ms
Transfer 155 KB
Unused 40%
Monthly Cost Kč91/mo
www.smart-network.cz
Other
Costly
Execution 205ms
Transfer 1 KB
Monthly Cost Kč82/mo

These scripts may cost more than they're worth

  • www.smart-network.cz adds 589ms and costs ~Kč237/month
  • www.smart-network.cz adds 240ms and costs ~Kč97/month
  • Google Tag Manager adds 228ms and costs ~Kč91/month
  • www.smart-network.cz adds 205ms and costs ~Kč82/month

66% 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.smart-network.cz takes 589ms 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.smart-network.cz takes 240ms 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

Google Tag Manager takes 228ms 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.smart-network.cz takes 205ms 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
117 images, 3693 KB total, 1554 KB wasted
INFO

Image Optimization Audit

Total Images

117

Total Size

3693 KB

Oversized

7

Wasted

1554 KB

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

Send Feedback