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https://mapy.cz

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
64
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
73
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.
82
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.

1.37 s

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

5.20 s

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

90 ms

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

0.097

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

2.58 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.

5.23 s

Page Load Progression

410 ms
820 ms
1.2 s
1.6 s
2.0 s
2.5 s
2.9 s
3.3 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
4.3 MB transferred, 141 requests
FIX
4.3 MB transferred, 141 requests
Critical::
Page weighs 10.1 MB (4.3 MB transferred)
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
Warning::
Images are 1.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.5 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::
141 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.91 g CO2 per page load
4.3 MB / 2.4 MB budget
4.3 MB transferred
141 requests
0.91 g CO2 per page load
JavaScript 2.1 MiB 49%
Images 1.5 MiB 36%
Fonts 362.3 KiB 8%
CSS 170.7 KiB 4%
Other 82.7 KiB 2%
Other 51.8 KiB 1%
Other 12.2 KiB 0%
HTML 6.8 KiB 0%
Other 1008 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

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 (4.3 MiB of 4.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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 (73%)
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.js75 KB70 KB (95%)✓3rd
https://geo.seznam.cz/static/js/geo.js46 KB33 KB (73%)✓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 (46%)✓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
141 resources · 4.3 MB · 1.2 MB savings available
FIX
141 resources · 4.3 MB · 1.2 MB savings available
Warning::
Page weight 3.3 MB over 1MB target
Got: 4.3 MB Expected: ≤ 1 MB
Info::
~1.2 MB of savings available
Warning::
140 third-party resources (100% of weight)
Info::
3 resources over 200KB
141 resources · 4.3 MiB · 140 third-party 3.3 MiB over 1MB target
JavaScript 49% · 2.1 MiB
Image 37% · 1.6 MiB
Font 8% · 362.3 KiB
CSS 4% · 170.7 KiB
Other 2% · 95.9 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.

C
Image Optimization
Action
68 images, 0 KB saveable
REVIEW
68 images, 0 KB saveable
Warning::
https://api.mapy.com/poiimg/icon/28 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://api.mapy.com/poiimg/icon/49 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://api.mapy.com/poiimg/icon/292 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://api.mapy.com/poiimg/icon/133 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
68 images 1.5 MB
0 oversized -0 KB
67 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

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

B
JS Execution Cost
787ms total JS execution
REVIEW
787ms total JS execution
Warning::
https://mapy.com/js/userweb.2.80.90.js?: 428ms CPU time
Info::
Unattributable: 169ms CPU time
Info::
https://mapy.com/en/: 122ms CPU time
Info::
https://h.seznam.cz/js/cmp2/scmp-lite.js: 68ms CPU time
Warning::
Third-party scripts: 787ms (100% of total)

Main Thread Breakdown

Script Evaluation 48% Other 27% Script Parsing & Compilation 15% Style & Layout 6%
ScriptTotalScriptingParse/CompileParty
https://mapy.com/js/userweb.2.80.90.js?428ms286ms85ms3rd
Unattributable169ms10ms0ms3rd
https://mapy.com/en/122ms3ms1ms3rd
https://h.seznam.cz/js/cmp2/scmp-lite.js68ms54ms12ms3rd
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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.4 s LCP 5.2 shttps://h.seznam.cz/js/cmp2/fonts/InterVariable.woff2InterVariable.woff2 https://h.seznam.cz/js/cmp2/fonts/InterVariable.woff2 — 344.5 KiB — 76 ms — font-display: swaphttps://mapy.com/fonts/mapy.woff?7mapy.woff https://mapy.com/fonts/mapy.woff?7 — 17.8 KiB — 41 ms — font-display: swap
InterVariable.woff2 woff2 swap
Size 344 KB
Load time 76 ms
Start 1.5 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 41 ms
Start 1.8 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
Network Waterfall
141 requests over 3073ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.4 s LCP 5.2 shttps://mapy.cz// https://mapy.cz/ — 301 — 126 B — 102 ms — h2https://mapy.com/mapy.com/ https://mapy.com/ — 302 — 216 B — 105 ms — h2https://mapy.com/en/mapy.com/en/ https://mapy.com/en/ — 200 — 5.3 KiB — 117 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 — 187 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 — 175 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 — 179 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 — 186 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 — 181 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 — 177 ms — h2https://h.seznam.cz/udidh.seznam.cz/udid https://h.seznam.cz/udid — 204 — 0 B — 36 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 — 213.0 KiB — 88 ms — h2https://mapy.com/mapLoad?lang=en&grpc=0&mobile=0&x=60&y=480mapy.com/mapLoad?lang=en&grpc=0&mob... https://mapy.com/mapLoad?lang=en&grpc=0&mobile=0&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 — 182 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 — 174 ms — h2https://api.mapy.com/v5/loader.jsapi.mapy.com/v5/loader.js https://api.mapy.com/v5/loader.js — 200 — 3.5 KiB — 120 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 — 40 ms — h2https://h.seznam.cz/udidh.seznam.cz/udid https://h.seznam.cz/udid — 200 — 484 B — 105 ms — h2https://h.seznam.cz/hith.seznam.cz/hit https://h.seznam.cz/hit — 204 — 0 B — 36 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 — 142.0 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 — 38 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 — 39 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://h.seznam.cz/hith.seznam.cz/hit https://h.seznam.cz/hit — 200 — 273 B — 38 ms — h2https://h.seznam.cz/hith.seznam.cz/hit https://h.seznam.cz/hit — 200 — 112 B — 38 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 — 140 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 — 23.6 KiB — 38 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://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 — 37 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 — 40 ms — h2https://api.mapy.cz/js/lang/en.js?v=5.6.18api.mapy.cz/js/lang/en.js?v=5.6.18 https://api.mapy.cz/js/lang/en.js?v=5.6.18 — 200 — 2.2 KiB — 36 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.4 s LCP 5.2 shttps://mapy.cz// https://mapy.cz/ — 301 — 126 B — 102 ms — h2https://mapy.com/mapy.com/ https://mapy.com/ — 302 — 216 B — 105 ms — h2https://mapy.com/en/mapy.com/en/ https://mapy.com/en/ — 200 — 5.3 KiB — 117 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 — 187 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 — 175 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 — 179 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 — 186 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 — 181 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 — 177 ms — h2https://h.seznam.cz/udidh.seznam.cz/udid https://h.seznam.cz/udid — 204 — 0 B — 36 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 — 213.0 KiB — 88 ms — h2https://mapy.com/mapLoad?lang=en&grpc=0&mobile=0&x=60&y=480mapy.com/mapLoad?lang=en&grpc=0&mob... https://mapy.com/mapLoad?lang=en&grpc=0&mobile=0&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 — 182 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 — 174 ms — h2https://api.mapy.com/v5/loader.jsapi.mapy.com/v5/loader.js https://api.mapy.com/v5/loader.js — 200 — 3.5 KiB — 120 ms — 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233 B — 37 ms — h2https://mapy.com/auth?1776900679116mapy.com/auth?1776900679116 https://mapy.com/auth?1776900679116 — 200 — 295 B — 40 ms — h2https://cmp.mapy.com/login-statecmp.mapy.com/login-state https://cmp.mapy.com/login-state — 200 — 45 B — 37 ms — h2https://h.seznam.cz/hith.seznam.cz/hit https://h.seznam.cz/hit — 200 — 112 B — 38 ms — h2https://h.seznam.cz/hith.seznam.cz/hit https://h.seznam.cz/hit — 200 — 112 B — 37 ms — h2https://login.mapy.com/api/v1/user/badge?service=mapy&_=0.7704287107885494login.mapy.com/api/v1/user/badge?se... https://login.mapy.com/api/v1/user/badge?service=mapy&_=0.7704287107885494 — 200 — 423 B — 37 ms — http/1.1https://mapy.com/img/favicon/common/plain/favicon.icomapy.com/img/favicon/common/plain/f... https://mapy.com/img/favicon/common/plain/favicon.ico — 200 — 42.8 KiB — 38 ms — h2https://mapy.com/img/favicon/common/web-app-manifest-192x192.pngmapy.com/img/favicon/common/web-app... https://mapy.com/img/favicon/common/web-app-manifest-192x192.png — 200 — 8.7 KiB — 39 ms — h2https://h.seznam.cz/hith.seznam.cz/hit https://h.seznam.cz/hit — 200 — 112 B — 37 ms — h2https://h.seznam.cz/hith.seznam.cz/hit https://h.seznam.cz/hit — 200 — 112 B — 39 ms — h2https://h.seznam.cz/hith.seznam.cz/hit https://h.seznam.cz/hit — 200 — 112 B — 38 ms — h2https://h.seznam.cz/hith.seznam.cz/hit https://h.seznam.cz/hit — 200 — 112 B — 37 ms — h2https://h.seznam.cz/hith.seznam.cz/hit https://h.seznam.cz/hit — 200 — 217 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 787ms · 1527KB · Kč97/mo
mapy.com
Other
Costly
Execution 428ms
Transfer 1309 KB
Unused 60%
Monthly Cost Kč53/mo
Unattributable
Other
Optional
Execution 169ms
Transfer 0 KB
Monthly Cost Kč21/mo
mapy.com
Other
Optional
Execution 122ms
Transfer 5 KB
Monthly Cost Kč15/mo
h.seznam.cz
Other
Optional
Execution 68ms
Transfer 213 KB
Unused 48%
Monthly Cost Kč8/mo

These scripts may cost more than they're worth

  • mapy.com adds 428ms and costs ~Kč53/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 428ms 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

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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