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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
2
REVIEW
4
PASS
9
INFO
2

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

Mobile Desktop
56
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
74
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
75
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.

1.36 s

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

3.92 s

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

333 ms

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

0.838

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

1.71 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.

4.63 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
9 PASS 4 REVIEW 2 FIX
D
Third-Party Impact
Action
66% third-party, 0 ms blocking
FIX
66% third-party, 0 ms blocking
Warning::
Third-party code accounts for 66% of page weight (412.3 KiB of 627.4 KiB)
Info::
Third-party blocking time is low (0 ms)
34%
66%
First-party Third-party
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
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Warning::
https://cdn.freesound.org/displays/851/851433_5287... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://freesound.org/static/bw-frontend/public/ph... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/851/851480_9034... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/850/850182_1059... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/850/850240_9034... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/850/850824_5287... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/851/851135_1842... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/851/851541_1288... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/851/851137_1842... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/404/404686_1944... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/842/842511_1825... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/740/740423_2675... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/614/614938_5828... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/850/850410_1151... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/506/506054_1099... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/851/851432_5287... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://freesound.org/static/bw-frontend/public/up... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/849/849976_1868... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/851/851136_1842... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/850/850812_1241... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/827/827367_1269... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/850/850694_1648... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/849/849524_1572... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/851/851434_5674... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/818/818085_1269... 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.
Warning::
https://cdn.freesound.org/displays/851/851529_1648... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/850/850138_1767... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/818/818086_1269... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/851/851532_3219... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/851/851457_7037... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.freesound.org/displays/850/850754_1288... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
35 images 240 KB
0 oversized -0 KB
33 legacy format
32 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

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

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

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

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

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

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.

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

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
1895ms total JS execution
REVIEW
1895ms total JS execution
Warning::
https://freesound.org/static/bw-frontend/dist/inde...: 705ms CPU time
Warning::
https://freesound.org/: 699ms CPU time
Warning::
Unattributable: 294ms CPU time
Info::
https://api.tiles.mapbox.com/mapbox-gl-js/v2.6.1/m...: 134ms CPU time
Info::
https://analytics.freesound.org/js/plausible.manua...: 63ms CPU time
Info::
Third-party scripts: 491ms (26% of total)

Main Thread Breakdown

Style & Layout 33% Other 26% Script Evaluation 21% Rendering 11% Script Parsing & Compilation 5% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://freesound.org/static/bw-frontend/dist/index.2b66cae7a11f.js705ms295ms11ms1st
https://freesound.org/699ms8ms3ms1st
Unattributable294ms7ms0ms3rd
https://api.tiles.mapbox.com/mapbox-gl-js/v2.6.1/mapbox-gl.js134ms58ms71ms3rd
https://analytics.freesound.org/js/plausible.manual.js63ms17ms1ms3rd
C
JS Bundles
Action
5 scripts, 206 KB unused
REVIEW
5 scripts, 206 KB unused
Warning::
https://api.tiles.mapbox.com/mapbox-gl-js/v2.6.1/m...: 185 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://freesound.org/static/bw-frontend/dist/inde...: 21 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 206 KB
206 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://api.tiles.mapbox.com/mapbox-gl-js/v2.6.1/mapbox-gl.js234 KB185 KB (79%)✓3rd
https://freesound.org/static/bw-frontend/dist/index.2b66cae7a11f.js41 KB21 KB (52%)✓1st
https://analytics.freesound.org/js/plausible.manual.js3 KB—✓3rd
https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-geocoder/v4.7.2/mapbox-gl-geocoder.min.js18 KB—✓3rd
https://freesound.org/static/bw-frontend/dist/pages/front.b358425614dc.js9 KB—✓1st

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

B
Page Weight Inventory
47 resources · 627 KB · 206 KB savings available
REVIEW
47 resources · 627 KB · 206 KB savings available
Info::
Within 1MB page-weight target
Got: 627 KB
Info::
~206 KB of savings available
Warning::
36 third-party resources (66% of weight)
Info::
1 resources over 200KB
47 resources · 627.4 KiB · 36 third-party Within 1MB page-weight target
JavaScript 49% · 304.4 KiB
Image 38% · 241.1 KiB
Document 8% · 51.3 KiB
CSS 3% · 21.8 KiB
Font 1% · 7.9 KiB
Other 0% · 893 B

~205.9 KiB of savings available

Remove unused JavaScript: 205.9 KiB
A+
Page Weight Budget
627 KB transferred, 47 requests
PASS
627 KB transferred, 47 requests
Info::
Page weighs 1.9 MB (627 KB transferred)
Info::
47 HTTP requests
Info::
Estimated 0.13 g CO2 per page load
627 KB / 2.4 MB budget
627 KB transferred
47 requests
0.13 g CO2 per page load
JavaScript 304.4 KiB 49%
Images 239.6 KiB 38%
HTML 51.3 KiB 8%
CSS 21.8 KiB 3%
Fonts 7.9 KiB 1%
Other 1.5 KiB 0%
Other 702 B 0%
Other 191 B 0%
0 2.4 MB 4.9 MB
Under budget
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
1 fonts (8 KB)
PASS
1 fonts (8 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

8 KB total

Render-blocking

0

of 1

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 FCP 1.4 s LCP 3.9 shttps://freesound.org/static/bw-frontend/dist/bw-icons.1fc88966.5e3225f9f93a.ttfbw-icons.1fc88966.5e322... https://freesound.org/static/bw-frontend/dist/bw-icons.1fc88966.5e3225f9f93a.ttf — 7.9 KiB — 50 ms — font-display: swap
bw-icons.1fc88966.5e322... ttf swap
Size 8 KB
Load time 50 ms
Start 316 ms
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 ~2 KB and ~4 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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Hetzner Online GmbH

Network Waterfall
47 requests over 976ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.4 s LCP 3.9 shttps://freesound.org// https://freesound.org/ — 200 — 51.3 KiB — 231 ms — h2https://freesound.org/static/bw-frontend/dist/index.e9e6280b633e.css/static/bw-frontend/dist/index.e9e6... https://freesound.org/static/bw-frontend/dist/index.e9e6280b633e.css — 200 — 15.0 KiB — 64 ms — h2https://freesound.org/site.webmanifest/site.webmanifest https://freesound.org/site.webmanifest — 200 — 702 B — 142 ms — h2https://freesound.org/static/bw-frontend/public/upf_logo.06e9f326ce68.png/static/bw-frontend/public/upf_logo... https://freesound.org/static/bw-frontend/public/upf_logo.06e9f326ce68.png — 200 — 31.2 KiB — 51 ms — h2https://freesound.org/static/bw-frontend/public/phonos_logo.7c586cfd83d2.png/static/bw-frontend/public/phonos_l... https://freesound.org/static/bw-frontend/public/phonos_logo.7c586cfd83d2.png — 200 — 51.6 KiB — 95 ms — h2https://analytics.freesound.org/js/plausible.manual.jsanalytics.freesound.org/js/plausibl... https://analytics.freesound.org/js/plausible.manual.js — 200 — 2.6 KiB — 206 ms — h2https://api.tiles.mapbox.com/mapbox-gl-js/v2.6.1/mapbox-gl.jsapi.tiles.mapbox.com/mapbox-gl-js/v... https://api.tiles.mapbox.com/mapbox-gl-js/v2.6.1/mapbox-gl.js — 200 — 233.5 KiB — 168 ms — h3https://api.tiles.mapbox.com/mapbox-gl-js/v2.6.1/mapbox-gl.cssapi.tiles.mapbox.com/mapbox-gl-js/v... https://api.tiles.mapbox.com/mapbox-gl-js/v2.6.1/mapbox-gl.css — 200 — 5.1 KiB — 133 ms — h3https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-geocoder/v4.7.2/mapbox-gl-geocoder.min.jsapi.mapbox.com/mapbox-gl-js/plugins... https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-geocoder/v4.7.2/mapbox-gl-geocoder.min.js — 200 — 18.2 KiB — 106 ms — h2https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-geocoder/v4.7.2/mapbox-gl-geocoder.cssapi.mapbox.com/mapbox-gl-js/plugins... https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-geocoder/v4.7.2/mapbox-gl-geocoder.css — 200 — 1.7 KiB — 106 ms — h2https://freesound.org/static/bw-frontend/dist/index.2b66cae7a11f.js/static/bw-frontend/dist/index.2b66... https://freesound.org/static/bw-frontend/dist/index.2b66cae7a11f.js — 200 — 40.9 KiB — 111 ms — h2https://freesound.org/static/bw-frontend/dist/pages/front.b358425614dc.js/static/bw-frontend/dist/pages/fron... https://freesound.org/static/bw-frontend/dist/pages/front.b358425614dc.js — 200 — 9.2 KiB — 93 ms — h2https://freesound.org/static/bw-frontend/dist/logo-text.02c68389.40a23ae51c8b.svg/static/bw-frontend/dist/logo-text.... https://freesound.org/static/bw-frontend/dist/logo-text.02c68389.40a23ae51c8b.svg — 200 — 2.9 KiB — 80 ms — h2https://freesound.org/static/bw-frontend/dist/logo-labs-text.856959f1.7f5d264c4246.svg/static/bw-frontend/dist/logo-labs-... https://freesound.org/static/bw-frontend/dist/logo-labs-text.856959f1.7f5d264c4246.svg — 200 — 2.9 KiB — 76 ms — h2https://freesound.org/static/bw-frontend/dist/bw-icons.1fc88966.5e3225f9f93a.ttf/static/bw-frontend/dist/bw-icons.1... https://freesound.org/static/bw-frontend/dist/bw-icons.1fc88966.5e3225f9f93a.ttf — 200 — 7.9 KiB — 50 ms — h2data:image/webp;base64,UklGRh4AAABXRUJQVlA4TBEAAAAvAQAAAAfQ//73v/+BiOh/AAA=data:image/webp;base64,UklGRh4AAABX... data:image/webp;base64,UklGRh4AAABXRUJQVlA4TBEAAAAvAQAAAAfQ//73v/+BiOh/AAA= — 200 — 0 B — 0 ms — datahttps://cdn.freesound.org/displays/851/851541_12880153_wave_bw_M.pngcdn.freesound.org/displays/851/8515... https://cdn.freesound.org/displays/851/851541_12880153_wave_bw_M.png — 200 — 2.5 KiB — 227 ms — h2https://cdn.freesound.org/displays/851/851532_321967_wave_bw_M.pngcdn.freesound.org/displays/851/8515... https://cdn.freesound.org/displays/851/851532_321967_wave_bw_M.png — 200 — 3.4 KiB — 225 ms — h2https://cdn.freesound.org/displays/851/851529_1648170_wave_bw_M.pngcdn.freesound.org/displays/851/8515... https://cdn.freesound.org/displays/851/851529_1648170_wave_bw_M.png — 200 — 2.8 KiB — 226 ms — h2https://cdn.freesound.org/displays/851/851480_9034501_wave_bw_M.pngcdn.freesound.org/displays/851/8514... https://cdn.freesound.org/displays/851/851480_9034501_wave_bw_M.png — 200 — 2.7 KiB — 185 ms — h2https://cdn.freesound.org/displays/851/851457_7037_wave_bw_M.pngcdn.freesound.org/displays/851/8514... https://cdn.freesound.org/displays/851/851457_7037_wave_bw_M.png — 200 — 3.1 KiB — 183 ms — h2https://cdn.freesound.org/displays/850/850182_10594370_wave_bw_M.pngcdn.freesound.org/displays/850/8501... https://cdn.freesound.org/displays/850/850182_10594370_wave_bw_M.png — 200 — 1.5 KiB — 222 ms — h2https://analytics.freesound.org/api/eventanalytics.freesound.org/api/event https://analytics.freesound.org/api/event — 202 — 191 B — 164 ms — h2https://freesound.org/favicon-32x32.png/favicon-32x32.png https://freesound.org/favicon-32x32.png — 200 — 1.5 KiB — 49 ms — 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— 830 B — 140 ms — h2https://cdn.freesound.org/displays/404/404686_1944470_wave_bw_M.pngcdn.freesound.org/displays/404/4046... https://cdn.freesound.org/displays/404/404686_1944470_wave_bw_M.png — 200 — 1.8 KiB — 139 ms — h2https://cdn.freesound.org/displays/842/842511_18255452_wave_bw_M.pngcdn.freesound.org/displays/842/8425... https://cdn.freesound.org/displays/842/842511_18255452_wave_bw_M.png — 200 — 1.3 KiB — 139 ms — h2https://cdn.freesound.org/displays/740/740423_2675894_wave_bw_M.pngcdn.freesound.org/displays/740/7404... https://cdn.freesound.org/displays/740/740423_2675894_wave_bw_M.png — 200 — 1.4 KiB — 142 ms — h2https://cdn.freesound.org/displays/614/614938_5828667_wave_bw_M.pngcdn.freesound.org/displays/614/6149... https://cdn.freesound.org/displays/614/614938_5828667_wave_bw_M.png — 200 — 4.2 KiB — 140 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
26% of JavaScript execution is third-party
First-party Third-party 491ms · 236KB · €5/mo
Unattributable
Other
Costly
Execution 294ms
Transfer 0 KB
Monthly Cost €3/mo
api.tiles.mapbox.com
Other
Optional
Execution 134ms
Transfer 234 KB
Unused 79%
Monthly Cost €1/mo
analytics.freesound.org
Other
Optional
Execution 63ms
Transfer 3 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 294ms and costs ~€3/month

Unattributable takes 294ms 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

79% of api.tiles.mapbox.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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