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https://smart-network.cz

Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
4
REVIEW
6
PASS
9
INFO
3

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

Mobile Desktop
92
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
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.

901 ms

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

1.67 s

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

100 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.001

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

916 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.

1.69 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
22
9 PASS 6 REVIEW 4 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 47 requests
FIX
3.0 MB transferred, 47 requests
Warning::
Page weighs 3.6 MB (3.0 MB transferred)
Warning::
Images are 2.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.7 MB
Info::
47 HTTP requests
Info::
Estimated 0.64 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
47 requests
0.64 g CO2 per page load
Images 2.7 MiB 88%
JavaScript 183.3 KiB 6%
Fonts 156.6 KiB 5%
CSS 25.5 KiB 1%
HTML 18.9 KiB 1%
Other 2.6 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 (3.0 MiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
47 resources · 3.0 MB · 62 KB savings available
FIX
47 resources · 3.0 MB · 62 KB savings available
Warning::
Page weight 3.0 MB exceeds 1 MB target by 2.0 MB
Got: 3.0 MB Expected: ≤ 1 MB
Info::
~62 KB of savings available
Warning::
46 third-party resources (100% of weight)
Info::
4 resources over 200KB
47 resources · 3.0 MiB · 46 third-party 2.0 MiB over 1MB target
Image 88% · 2.7 MiB
JavaScript 6% · 183.3 KiB
Font 5% · 156.6 KiB
CSS 1% · 25.5 KiB
Document 1% · 19.0 KiB
Other 0% · 496 B

~61.9 KiB of savings available

Remove unused JavaScript: 61.9 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
28 images, 0 KB saveable
REVIEW
28 images, 0 KB saveable
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.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
28 images 2.7 MB
0 oversized -0 KB
15 legacy format
4 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

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

Performance issues directly impact user engagement and conversion rates.

B
JS Execution Cost
643ms total JS execution
REVIEW
643ms total JS execution
Warning::
https://www.smart-network.cz/frontend/dist/assets/...: 300ms CPU time
Info::
Unattributable: 110ms CPU time
Info::
https://www.smart-network.cz/: 108ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=AW-171...: 71ms CPU time
Info::
https://www.smart-network.cz/frontend/dist/assets/...: 55ms CPU time
Warning::
Third-party scripts: 533ms (83% of total)

Main Thread Breakdown

Style & Layout 57% Other 21% Script Evaluation 16%
ScriptTotalScriptingParse/CompileParty
https://www.smart-network.cz/frontend/dist/assets/splide-B8WRMK72.js300ms29ms0ms3rd
Unattributable110ms2ms0ms1st
https://www.smart-network.cz/108ms7ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-1711943458171ms60ms10ms3rd
https://www.smart-network.cz/frontend/dist/assets/headspace-D57y36bR.js55ms1ms0ms3rd
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.
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 500 ms 1.0 s 1.5 s FCP 901 ms LCP 1.7 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 — 43.8 KiB — 91 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 — 91 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 — 44.1 KiB — 25 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 — 26.9 KiB — 28 ms — font-display: swap
Gilroy-Regular-DSXAYGo9... woff2 swap
Size 44 KB
Load time 91 ms
Start 287 ms
Risk FOUT — text flashes from fallback to web font
Gilroy-ExtraBold-3Oes9p... woff2 swap
Size 42 KB
Load time 91 ms
Start 288 ms
Risk FOUT — text flashes from fallback to web font
Gilroy-Bold-BzGepy1p.woff2 woff2 swap
Size 44 KB
Load time 25 ms
Start 407 ms
Risk FOUT — text flashes from fallback to web font
Gilroy-Semibold-DvlKZn4... woff2 swap
Size 27 KB
Load time 28 ms
Start 407 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
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+
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+
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
47 requests over 1138ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 901 ms LCP 1.7 shttps://smart-network.cz// https://smart-network.cz/ — 301 — 475 B — 130 ms — h3https://www.smart-network.cz/www.smart-network.cz/ https://www.smart-network.cz/ — 200 — 18.9 KiB — 154 ms — h3https://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 — 43.8 KiB — 91 ms — h3https://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 — 91 ms — h3https://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 — 47.0 KiB — 92 ms — h3https://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 — 20.9 KiB — 39 ms — h3https://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 — 827 B — 28 ms — h3https://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 — 1.9 KiB — 43 ms — h3https://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 — 1.4 KiB — 50 ms — h3https://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 — 1.1 KiB — 24 ms — h3https://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 — 14.1 KiB — 62 ms — h3https://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 — 11.2 KiB — 64 ms — h3https://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 — 1.0 KiB — 23 ms — h3https://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 — 219.7 KiB — 129 ms — h3https://www.smart-network.cz/smart-app-banner.csswww.smart-network.cz/smart-app-bann... https://www.smart-network.cz/smart-app-banner.css — 200 — 1.9 KiB — 50 ms — h3https://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 — 161 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 — 10.4 KiB — 38 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 — 93.6 KiB — 57 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 — 118.3 KiB — 59 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 — 339.7 KiB — 70 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 — 245.9 KiB — 67 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 — 972 B — 31 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 — 44.1 KiB — 25 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 — 26.9 KiB — 28 ms — h3https://www.smart-network.cz/frontend/dist/assets/email-Dt3EziLo.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/email-Dt3EziLo.svg — 200 — 1.1 KiB — 35 ms — h3https://www.smart-network.cz/frontend/dist/assets/phone-E3Ck1oA1.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/phone-E3Ck1oA1.svg — 200 — 1.2 KiB — 36 ms — h3https://www.smart-network.cz/frontend/dist/assets/icon-user-I6Ld02p9.svgwww.smart-network.cz/frontend/dist/... https://www.smart-network.cz/frontend/dist/assets/icon-user-I6Ld02p9.svg — 200 — 1.2 KiB — 25 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 — 132 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 — 865 B — 36 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 — 35 ms — h3
0 ms 500 ms 1.0 s 1.5 s FCP 901 ms LCP 1.7 shttps://smart-network.cz// https://smart-network.cz/ — 301 — 475 B — 130 ms — h3https://www.smart-network.cz/www.smart-network.cz/ https://www.smart-network.cz/ — 200 — 18.9 KiB — 154 ms — h3https://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 — 43.8 KiB — 91 ms — h3https://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 — 91 ms — h3https://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 — 47.0 KiB — 92 ms — h3https://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 — 20.9 KiB — 39 ms — h3https://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 — 827 B — 28 ms — h3https://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 — 1.9 KiB — 43 ms — h3https://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 — 1.4 KiB — 50 ms — h3https://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 — 1.1 KiB — 24 ms — h3https://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 — 14.1 KiB — 62 ms — h3https://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 — 11.2 KiB — 64 ms — h3https://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 — 1.0 KiB — 23 ms — h3https://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 — 219.7 KiB — 129 ms — h3https://www.smart-network.cz/smart-app-banner.csswww.smart-network.cz/smart-app-bann... https://www.smart-network.cz/smart-app-banner.css — 200 — 1.9 KiB — 50 ms — h3https://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 — 161 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 — 10.4 KiB — 38 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 — 93.6 KiB — 57 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 — 118.3 KiB — 59 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
83% of JavaScript execution is third-party
First-party Third-party 533ms · 189KB · Kč214/mo
www.smart-network.cz
Other
Costly
Execution 300ms
Transfer 14 KB
Monthly Cost Kč120/mo
www.smart-network.cz
Other
Optional
Execution 108ms
Transfer 19 KB
Monthly Cost Kč43/mo
Google Tag Manager
Tag Manager
Optional
Execution 71ms
Transfer 155 KB
Unused 40%
Monthly Cost Kč28/mo
www.smart-network.cz
Other
Optional
Execution 55ms
Transfer 1 KB
Monthly Cost Kč22/mo

These scripts may cost more than they're worth

  • www.smart-network.cz adds 300ms and costs ~Kč120/month

83% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.smart-network.cz takes 300ms 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.

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