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https://mapy.cz

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
40
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.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
91
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.

14.21 s

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

26.97 s

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

606 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.

14.21 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.

27.06 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
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
5.4 MB transferred, 133 requests
FIX
5.4 MB transferred, 133 requests
Critical::
Page weighs 11.2 MB (5.4 MB transferred)
Warning::
Images are 2.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.6 MB
Warning::
JavaScript is 2.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.1 MB
Info::
Fonts are 362 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 362 KB
Warning::
133 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.1 g CO2 per page load
5.4 MB / 2.4 MB budget
5.4 MB transferred
133 requests
1.1 g CO2 per page load
Images 2.6 MiB 48%
JavaScript 2.1 MiB 39%
Fonts 362.3 KiB 7%
CSS 170.7 KiB 3%
Other 82.9 KiB 1%
Other 51.8 KiB 1%
Other 12.5 KiB 0%
HTML 6.8 KiB 0%
Other 1008 B 0%
Other 0 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (5.4 MiB of 5.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3339ms total JS execution
FIX
3339ms total JS execution
Warning::
https://mapy.com/js/userweb.2.80.90.js?: 1675ms CPU time
Warning::
Unattributable: 607ms CPU time
Warning::
https://mapy.com/en/: 345ms CPU time
Warning::
https://h.seznam.cz/js/cmp2/scmp-lite.js: 261ms CPU time
Info::
https://h.seznam.cz/js/dot-small.js: 215ms CPU time
Warning::
Third-party scripts: 3339ms (100% of total)

Main Thread Breakdown

Script Evaluation 52% Other 24% Script Parsing & Compilation 16% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
https://mapy.com/js/userweb.2.80.90.js?1675ms1141ms344ms3rd
Unattributable607ms42ms0ms3rd
https://mapy.com/en/345ms14ms4ms3rd
https://h.seznam.cz/js/cmp2/scmp-lite.js261ms202ms46ms3rd
https://h.seznam.cz/js/dot-small.js215ms178ms17ms3rd
https://h.seznam.cz/js/cmp2/d_876/c_static_qA_A/kcHp2YdDtCDcb50YfGZQtVp/5785/825.scmpChunk.js96ms80ms8ms3rd
https://api.mapy.cz/js/api/v5/smap-jak.js?v=5.6.1883ms32ms41ms3rd
https://c.seznam.cz/js/rc.js57ms40ms17ms3rd
F
JS Bundles
Action
20 scripts, 1.2 MB unused
FIX
20 scripts, 1.2 MB unused
Warning::
https://mapy.com/js/userweb.2.80.90.js?: 782 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://h.seznam.cz/js/cmp2/scmp-lite.js: 100 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://api.mapy.cz/js/api/v5/smap-jak.js?v=5.6.18: 99 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://h.seznam.cz/js/cmp2/d_876/c_static_qA_A/kc...: 70 KB unused (95%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://geo.seznam.cz/static/js/geo.js: 33 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.2 MB
1231 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://mapy.com/js/userweb.2.80.90.js?1309 KB782 KB (60%)✓3rd
https://h.seznam.cz/js/cmp2/scmp-lite.js213 KB100 KB (48%)✓3rd
https://api.mapy.cz/js/api/v5/smap-jak.js?v=5.6.18142 KB99 KB (70%)✓3rd
https://h.seznam.cz/js/cmp2/d_876/c_static_qA_A/kcHp2YdDtCDcb50YfGZQtVp/5785/772.scmpChunk.js74 KB70 KB (95%)✓3rd
https://geo.seznam.cz/static/js/geo.js46 KB33 KB (72%)✓3rd
https://c.seznam.cz/js/rc.js47 KB31 KB (67%)✓3rd
https://ssp.seznam.cz/static/js/ssp.js45 KB31 KB (68%)✓3rd
https://mapy.com/js/lang-en.2.80.90.js?53 KB29 KB (56%)✓3rd
https://h.seznam.cz/js/dot-small.js62 KB28 KB (45%)✓3rd
https://login.szn.cz/js/api/3/login.js40 KB27 KB (68%)✓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

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

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

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

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

F
Page Weight Inventory
Action
133 resources · 5.4 MB · 1.2 MB savings available
FIX
133 resources · 5.4 MB · 1.2 MB savings available
Warning::
Page weight 4.4 MB over 1MB target
Got: 5.4 MB Expected: ≤ 1 MB
Info::
~1.2 MB of savings available
Warning::
132 third-party resources (100% of weight)
Info::
3 resources over 200KB
133 resources · 5.4 MiB · 132 third-party 4.4 MiB over 1MB target
Image 49% · 2.7 MiB
JavaScript 39% · 2.1 MiB
Font 7% · 362.3 KiB
CSS 3% · 170.7 KiB
Other 2% · 96.4 KiB
Document 0% · 7.2 KiB

~1.2 MiB of savings available

Remove unused JavaScript: 1.2 MiB
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
56 images, 0 KB saveable
REVIEW
56 images, 0 KB saveable
Info::
All images are well-optimized
56 images 2.6 MB
0 oversized -0 KB
55 legacy format
0 missing dimensions CLS risk
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 (362 KB)
PASS
2 fonts (362 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

362 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s FCP 14.2 s LCP 27.0 shttps://h.seznam.cz/js/cmp2/fonts/InterVariable.woff2InterVariable.woff2 https://h.seznam.cz/js/cmp2/fonts/InterVariable.woff2 — 344.5 KiB — 94 ms — font-display: swaphttps://mapy.com/fonts/mapy.woff?7mapy.woff https://mapy.com/fonts/mapy.woff?7 — 17.8 KiB — 38 ms — font-display: swap
InterVariable.woff2 woff2 swap
Size 344 KB
Load time 94 ms
Start 1.6 s
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
mapy.woff woff swap
Size 18 KB
Load time 38 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~178 KB and ~356 ms

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+
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
Network Waterfall
133 requests over 3129ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s FCP 14.2 s LCP 27.0 shttps://mapy.cz// https://mapy.cz/ — 301 — 126 B — 106 ms — h2https://mapy.com/mapy.com/ https://mapy.com/ — 302 — 216 B — 110 ms — h2https://mapy.com/en/mapy.com/en/ https://mapy.com/en/ — 200 — 5.3 KiB — 43 ms — h2https://h.seznam.cz/js/dot-small.jsh.seznam.cz/js/dot-small.js https://h.seznam.cz/js/dot-small.js — 200 — 62.0 KiB — 234 ms — h2https://login.szn.cz/js/api/3/login.jslogin.szn.cz/js/api/3/login.js https://login.szn.cz/js/api/3/login.js — 200 — 40.3 KiB — 204 ms — http/1.1https://mapy.com/css/main.2.80.90.css?smapy.com/css/main.2.80.90.css?s https://mapy.com/css/main.2.80.90.css?s — 200 — 162.9 KiB — 158 ms — h2https://mapy.com/js/lang-en.2.80.90.js?mapy.com/js/lang-en.2.80.90.js? https://mapy.com/js/lang-en.2.80.90.js? — 200 — 52.8 KiB — 178 ms — h2https://mapy.com/img/favicon/common/manifest.webmanifestmapy.com/img/favicon/common/manifes... https://mapy.com/img/favicon/common/manifest.webmanifest — 200 — 1008 B — 157 ms — h2https://geo.seznam.cz/static/js/geo.jsgeo.seznam.cz/static/js/geo.js https://geo.seznam.cz/static/js/geo.js — 200 — 46.3 KiB — 240 ms — h2https://h.seznam.cz/js/cmp2/scmp-lite.jsh.seznam.cz/js/cmp2/scmp-lite.js https://h.seznam.cz/js/cmp2/scmp-lite.js — 200 — 213.1 KiB — 88 ms — h2https://h.seznam.cz/udidh.seznam.cz/udid https://h.seznam.cz/udid — 204 — 0 B — 69 ms — h2https://mapy.com/mapLoad?lang=en&grpc=0&mobile=1&x=60&y=480mapy.com/mapLoad?lang=en&grpc=0&mob... https://mapy.com/mapLoad?lang=en&grpc=0&mobile=1&x=60&y=480 — 200 — 7.8 KiB — 48 ms — h2https://c.seznam.cz/js/rc.jsc.seznam.cz/js/rc.js https://c.seznam.cz/js/rc.js — 200 — 47.3 KiB — 217 ms — h2https://ssp.seznam.cz/static/js/ssp.jsssp.seznam.cz/static/js/ssp.js https://ssp.seznam.cz/static/js/ssp.js — 200 — 45.4 KiB — 231 ms — h2https://api.mapy.com/v5/loader.jsapi.mapy.com/v5/loader.js https://api.mapy.com/v5/loader.js — 200 — 3.5 KiB — 249 ms — h2https://mapy.com/css/print.2.80.90.css?smapy.com/css/print.2.80.90.css?s https://mapy.com/css/print.2.80.90.css?s — 200 — 1.3 KiB — 39 ms — h2https://h.seznam.cz/udidh.seznam.cz/udid https://h.seznam.cz/udid — 200 — 485 B — 105 ms — h2https://h.seznam.cz/hith.seznam.cz/hit https://h.seznam.cz/hit — 204 — 0 B — 35 ms — h2https://h.seznam.cz/hith.seznam.cz/hit https://h.seznam.cz/hit — 200 — 190 B — 38 ms — h2https://h.seznam.cz/hith.seznam.cz/hit https://h.seznam.cz/hit — 200 — 112 B — 37 ms — h2https://cmp.seznam.cz/vendorlist/v3/vendor-list.json?type=1cmp.seznam.cz/vendorlist/v3/vendor-... https://cmp.seznam.cz/vendorlist/v3/vendor-list.json?type=1 — 200 — 13.9 KiB — 211 ms — h2https://api.mapy.cz/js/api/v5/smap-jak.js?v=5.6.18api.mapy.cz/js/api/v5/smap-jak.js?v... https://api.mapy.cz/js/api/v5/smap-jak.js?v=5.6.18 — 200 — 141.9 KiB — 154 ms — h2https://api.mapy.cz/css/api/v5/smap-jak.css?v5.6.18api.mapy.cz/css/api/v5/smap-jak.css... https://api.mapy.cz/css/api/v5/smap-jak.css?v5.6.18 — 200 — 3.8 KiB — 41 ms — h2https://api.mapy.cz/css/api/v5/poi.css?v5.6.18api.mapy.cz/css/api/v5/poi.css?v5.6... https://api.mapy.cz/css/api/v5/poi.css?v5.6.18 — 200 — 2.2 KiB — 43 ms — h2https://api.mapy.cz/css/api/v5/suggest.css?v5.6.18api.mapy.cz/css/api/v5/suggest.css?... https://api.mapy.cz/css/api/v5/suggest.css?v5.6.18 — 200 — 571 B — 37 ms — h2https://api.mapy.cz/v5/config.js?key=&v=5.6.18api.mapy.cz/v5/config.js?key=&v=5.6... https://api.mapy.cz/v5/config.js?key=&v=5.6.18 — 200 — 23.5 KiB — 38 ms — h2https://cmp.seznam.cz/vendorlist/v3/purposes-cs.json?type=1cmp.seznam.cz/vendorlist/v3/purpose... https://cmp.seznam.cz/vendorlist/v3/purposes-cs.json?type=1 — 200 — 9.2 KiB — 42 ms — h2https://api.mapy.cz/js/api/v5/poi.js?v=5.6.18api.mapy.cz/js/api/v5/poi.js?v=5.6.... https://api.mapy.cz/js/api/v5/poi.js?v=5.6.18 — 200 — 13.1 KiB — 37 ms — h2https://h.seznam.cz/html/cmp.html?v=2.596.1h.seznam.cz/html/cmp.html?v=2.596.1 https://h.seznam.cz/html/cmp.html?v=2.596.1 — 200 — 1.5 KiB — 108 ms — h2https://api.mapy.cz/js/api/v5/suggest.js?v=5.6.18api.mapy.cz/js/api/v5/suggest.js?v=... https://api.mapy.cz/js/api/v5/suggest.js?v=5.6.18 — 200 — 6.5 KiB — 36 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s FCP 14.2 s LCP 27.0 shttps://mapy.cz// https://mapy.cz/ — 301 — 126 B — 106 ms — h2https://mapy.com/mapy.com/ https://mapy.com/ — 302 — 216 B — 110 ms — h2https://mapy.com/en/mapy.com/en/ https://mapy.com/en/ — 200 — 5.3 KiB — 43 ms — h2https://h.seznam.cz/js/dot-small.jsh.seznam.cz/js/dot-small.js https://h.seznam.cz/js/dot-small.js — 200 — 62.0 KiB — 234 ms — h2https://login.szn.cz/js/api/3/login.jslogin.szn.cz/js/api/3/login.js https://login.szn.cz/js/api/3/login.js — 200 — 40.3 KiB — 204 ms — http/1.1https://mapy.com/css/main.2.80.90.css?smapy.com/css/main.2.80.90.css?s https://mapy.com/css/main.2.80.90.css?s — 200 — 162.9 KiB — 158 ms — h2https://mapy.com/js/lang-en.2.80.90.js?mapy.com/js/lang-en.2.80.90.js? https://mapy.com/js/lang-en.2.80.90.js? — 200 — 52.8 KiB — 178 ms — h2https://mapy.com/img/favicon/common/manifest.webmanifestmapy.com/img/favicon/common/manifes... https://mapy.com/img/favicon/common/manifest.webmanifest — 200 — 1008 B — 157 ms — h2https://geo.seznam.cz/static/js/geo.jsgeo.seznam.cz/static/js/geo.js https://geo.seznam.cz/static/js/geo.js — 200 — 46.3 KiB — 240 ms — h2https://h.seznam.cz/js/cmp2/scmp-lite.jsh.seznam.cz/js/cmp2/scmp-lite.js https://h.seznam.cz/js/cmp2/scmp-lite.js — 200 — 213.1 KiB — 88 ms — h2https://h.seznam.cz/udidh.seznam.cz/udid https://h.seznam.cz/udid — 204 — 0 B — 69 ms — h2https://mapy.com/mapLoad?lang=en&grpc=0&mobile=1&x=60&y=480mapy.com/mapLoad?lang=en&grpc=0&mob... https://mapy.com/mapLoad?lang=en&grpc=0&mobile=1&x=60&y=480 — 200 — 7.8 KiB — 48 ms — h2https://c.seznam.cz/js/rc.jsc.seznam.cz/js/rc.js https://c.seznam.cz/js/rc.js — 200 — 47.3 KiB — 217 ms — h2https://ssp.seznam.cz/static/js/ssp.jsssp.seznam.cz/static/js/ssp.js https://ssp.seznam.cz/static/js/ssp.js — 200 — 45.4 KiB — 231 ms — h2https://api.mapy.com/v5/loader.jsapi.mapy.com/v5/loader.js https://api.mapy.com/v5/loader.js — 200 — 3.5 KiB — 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https://h.seznam.cz/hit — 200 — 87 B — 42 ms — h2https://h.seznam.cz/hith.seznam.cz/hit https://h.seznam.cz/hit — 200 — 112 B — 44 ms — h2https://h.seznam.cz/hith.seznam.cz/hit https://h.seznam.cz/hit — 200 — 112 B — 66 ms — h2https://h.seznam.cz/hith.seznam.cz/hit https://h.seznam.cz/hit — 200 — 112 B — 37 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 3339ms · 1807KB · Kč412/mo
mapy.com
Other
Costly
Execution 1675ms
Transfer 1309 KB
Unused 60%
Monthly Cost Kč207/mo
Unattributable
Other
Costly
Execution 607ms
Transfer 0 KB
Monthly Cost Kč75/mo
mapy.com
Other
Costly
Execution 345ms
Transfer 5 KB
Monthly Cost Kč43/mo
h.seznam.cz
Other
Costly
Execution 261ms
Transfer 213 KB
Unused 48%
Monthly Cost Kč32/mo
h.seznam.cz
Other
Costly
Execution 215ms
Transfer 62 KB
Unused 45%
Monthly Cost Kč27/mo
h.seznam.cz
Other
Optional
Execution 96ms
Transfer 29 KB
Monthly Cost Kč12/mo
api.mapy.cz
Other
Optional
Execution 83ms
Transfer 142 KB
Unused 70%
Monthly Cost Kč10/mo
c.seznam.cz
Other
Optional
Execution 57ms
Transfer 47 KB
Unused 67%
Monthly Cost Kč7/mo

These scripts may cost more than they're worth

  • mapy.com adds 1675ms and costs ~Kč207/month
  • Unattributable adds 607ms and costs ~Kč75/month
  • mapy.com adds 345ms and costs ~Kč43/month
  • h.seznam.cz adds 261ms and costs ~Kč32/month
  • h.seznam.cz adds 215ms and costs ~Kč27/month

100% 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

mapy.com takes 1675ms 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

60% of mapy.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

Unattributable takes 607ms 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

mapy.com takes 345ms 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

h.seznam.cz takes 261ms 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

h.seznam.cz takes 215ms 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

70% of api.mapy.cz's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

67% of c.seznam.cz's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

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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