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https://couchsurfing.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
2
REVIEW
2
PASS
9
INFO
2

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

Mobile Desktop
89
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

1.26 s

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

1.58 s

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

4 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.

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.

1.80 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
15
9 PASS 2 REVIEW 2 FIX
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 (844.8 KiB of 844.9 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
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
JS Bundles
Action
41 scripts, 192 KB unused
REVIEW
41 scripts, 192 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=GTM-KC...: 55 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/bundle/sdk.js/: 54 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.hotjar.com/modules.6a0f3932cb1341a3...: 38 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.couchsurfing.com/_next/static/chunks/1...: 24 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.couchsurfing.com/_next/static/chunks/6...: 20 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 192 KB
192 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=GTM-KC3GXKG85 KB55 KB (65%)✓3rd
https://connect.facebook.net/en_US/bundle/sdk.js/78 KB54 KB (70%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB38 KB (67%)✓3rd
https://www.couchsurfing.com/_next/static/chunks/1286-53c199d3d7e9bf7c.js45 KB24 KB (55%)✓3rd
https://www.couchsurfing.com/_next/static/chunks/6472.979f65e4eacac81f.js45 KB20 KB (46%)✓3rd
https://www.couchsurfing.com/_next/static/chunks/5357-fadf5353841e9502.js4 KB—✓3rd
https://www.couchsurfing.com/_next/static/chunks/7596-6a3a1cba7dc205b6.js32 KB—✓3rd
https://www.couchsurfing.com/_next/static/chunks/3124-dd1bc51ddd4546c7.js34 KB—✓3rd
https://www.couchsurfing.com/_next/static/chunks/7577-df79c9f1388ae97d.js43 KB—✓3rd
https://www.couchsurfing.com/_next/static/chunks/9692-be782428f85590cd.js3 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

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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
845 KB transferred, 67 requests
PASS
845 KB transferred, 67 requests
Info::
Page weighs 2.3 MB (845 KB transferred)
Warning::
JavaScript is 646 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 646 KB
Info::
67 HTTP requests
Info::
Estimated 0.17 g CO2 per page load
845 KB / 2.4 MB budget
845 KB transferred
67 requests
0.17 g CO2 per page load
JavaScript 646.3 KiB 76%
Fonts 86.0 KiB 10%
HTML 36.5 KiB 4%
Other 34.1 KiB 4%
Images 26.8 KiB 3%
CSS 13.9 KiB 2%
Other 878 B 0%
Other 396 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under 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

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+
Image Optimization
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Info::
All images are well-optimized
2 images 27 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
397ms total JS execution
PASS
397ms total JS execution
Info::
https://www.couchsurfing.com/_next/static/chunks/6...: 171ms CPU time
Info::
Unattributable: 87ms CPU time
Info::
https://www.couchsurfing.com/welcome: 79ms CPU time
Info::
https://www.couchsurfing.com/_next/static/chunks/7...: 60ms CPU time
Warning::
Third-party scripts: 397ms (100% of total)

Main Thread Breakdown

Script Evaluation 59% Other 18% Script Parsing & Compilation 10% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
https://www.couchsurfing.com/_next/static/chunks/6233-4276772c5b8d0986.js171ms159ms3ms3rd
Unattributable87ms3ms0ms3rd
https://www.couchsurfing.com/welcome79ms3ms6ms3rd
https://www.couchsurfing.com/_next/static/chunks/7577-df79c9f1388ae97d.js60ms49ms5ms3rd
A+
Font Loading
6 fonts (86 KB)
PASS
6 fonts (86 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

86 KB total

Render-blocking

0

of 6

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 2.0 s FCP 1.3 s LCP 1.6 shttps://www.couchsurfing.com/_next/static/media/155cae559bbd1a77-s.p.woff2155cae559bbd1a77-s.p.woff2 https://www.couchsurfing.com/_next/static/media/155cae559bbd1a77-s.p.woff2 — 14.2 KiB — 361 ms — font-display: swaphttps://www.couchsurfing.com/_next/static/media/4de1fea1a954a5b6-s.p.woff24de1fea1a954a5b6-s.p.woff2 https://www.couchsurfing.com/_next/static/media/4de1fea1a954a5b6-s.p.woff2 — 14.3 KiB — 364 ms — font-display: swaphttps://www.couchsurfing.com/_next/static/media/6d664cce900333ee-s.p.woff26d664cce900333ee-s.p.woff2 https://www.couchsurfing.com/_next/static/media/6d664cce900333ee-s.p.woff2 — 14.5 KiB — 360 ms — font-display: swaphttps://www.couchsurfing.com/_next/static/media/155cae559bbd1a77-s.p.woff2155cae559bbd1a77-s.p.woff2 https://www.couchsurfing.com/_next/static/media/155cae559bbd1a77-s.p.woff2 — 14.2 KiB — 193 ms — font-display: swaphttps://www.couchsurfing.com/_next/static/media/4de1fea1a954a5b6-s.p.woff24de1fea1a954a5b6-s.p.woff2 https://www.couchsurfing.com/_next/static/media/4de1fea1a954a5b6-s.p.woff2 — 14.3 KiB — 191 ms — font-display: swaphttps://www.couchsurfing.com/_next/static/media/6d664cce900333ee-s.p.woff26d664cce900333ee-s.p.woff2 https://www.couchsurfing.com/_next/static/media/6d664cce900333ee-s.p.woff2 — 14.5 KiB — 123 ms — font-display: swap
155cae559bbd1a77-s.p.woff2 woff2 swap
Size 14 KB
Load time 361 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
4de1fea1a954a5b6-s.p.woff2 woff2 swap
Size 14 KB
Load time 364 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
6d664cce900333ee-s.p.woff2 woff2 swap
Size 14 KB
Load time 360 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
155cae559bbd1a77-s.p.woff2 woff2 swap
Size 14 KB
Load time 193 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
4de1fea1a954a5b6-s.p.woff2 woff2 swap
Size 14 KB
Load time 191 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
6d664cce900333ee-s.p.woff2 woff2 swap
Size 14 KB
Load time 123 ms
Start 1.9 s
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
Page Weight Inventory
67 resources · 845 KB · 192 KB savings available
PASS
67 resources · 845 KB · 192 KB savings available
Info::
Within 1MB page-weight target
Got: 845 KB
Info::
~192 KB of savings available
Warning::
66 third-party resources (100% of weight)
67 resources · 844.9 KiB · 66 third-party Within 1MB page-weight target
JavaScript 76% · 646.3 KiB
Font 10% · 86.0 KiB
Document 8% · 63.8 KiB
Image 4% · 33.6 KiB
CSS 2% · 13.9 KiB
Other 0% · 1.2 KiB

~192.2 KiB of savings available

Remove unused JavaScript: 192.2 KiB
Network Waterfall
67 requests over 3981ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.3 s LCP 1.6 shttps://couchsurfing.com// https://couchsurfing.com/ — 301 — 89 B — 288 ms — h2https://www.couchsurfing.com/www.couchsurfing.com/ https://www.couchsurfing.com/ — 302 — 1.1 KiB — 331 ms — h2https://www.couchsurfing.com/welcomewww.couchsurfing.com/welcome https://www.couchsurfing.com/welcome — 200 — 36.5 KiB — 831 ms — h2https://www.couchsurfing.com/_next/static/media/155cae559bbd1a77-s.p.woff2www.couchsurfing.com/_next/static/m... https://www.couchsurfing.com/_next/static/media/155cae559bbd1a77-s.p.woff2 — 200 — 14.2 KiB — 361 ms — h2https://www.couchsurfing.com/_next/static/media/4de1fea1a954a5b6-s.p.woff2www.couchsurfing.com/_next/static/m... https://www.couchsurfing.com/_next/static/media/4de1fea1a954a5b6-s.p.woff2 — 200 — 14.3 KiB — 364 ms — h2https://www.couchsurfing.com/_next/static/media/6d664cce900333ee-s.p.woff2www.couchsurfing.com/_next/static/m... https://www.couchsurfing.com/_next/static/media/6d664cce900333ee-s.p.woff2 — 200 — 14.5 KiB — 360 ms — h2https://www.couchsurfing.com/_next/image?url=%2F_next%2Fstatic%2Fmedia%2Flogo-full.b9a1e2af.png&w=128&q=75www.couchsurfing.com/_next/image?ur... https://www.couchsurfing.com/_next/image?url=%2F_next%2Fstatic%2Fmedia%2Flogo-full.b9a1e2af.png&w=128&q=75 — 200 — 4.1 KiB — 288 ms — h2https://www.couchsurfing.com/_next/static/css/18c9f0afcd137cb8.csswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/css/18c9f0afcd137cb8.css — 200 — 3.8 KiB — 284 ms — h2https://www.couchsurfing.com/_next/static/css/a3026e26ffce4ce1.csswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/css/a3026e26ffce4ce1.css — 200 — 4.5 KiB — 276 ms — h2https://www.couchsurfing.com/_next/static/css/09a07f06d80877ff.csswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/css/09a07f06d80877ff.css — 200 — 1.2 KiB — 274 ms — h2https://www.couchsurfing.com/_next/static/css/aa021322dc339b14.csswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/css/aa021322dc339b14.css — 200 — 1.4 KiB — 279 ms — h2https://www.couchsurfing.com/_next/static/css/41e707f4844fd798.csswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/css/41e707f4844fd798.css — 200 — 1.3 KiB — 277 ms — h2https://www.couchsurfing.com/_next/static/css/6cc27ca3e0c8ea92.csswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/css/6cc27ca3e0c8ea92.css — 200 — 969 B — 281 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 63 ms — https://www.couchsurfing.com/_next/static/css/7607cb9e43dac3dc.csswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/css/7607cb9e43dac3dc.css — 200 — 898 B — 285 ms — h2https://www.googletagmanager.com/gtag/js?id=GTM-KC3GXKGwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=GTM-KC3GXKG — 200 — 85.0 KiB — 161 ms — h2https://www.couchsurfing.com/_next/static/chunks/webpack-80301661d555a276.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/webpack-80301661d555a276.js — 200 — 2.8 KiB — 295 ms — h2https://www.couchsurfing.com/_next/static/chunks/cae36a94-de4f6f4a971ae9ca.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/cae36a94-de4f6f4a971ae9ca.js — 200 — 53.3 KiB — 454 ms — h2https://www.couchsurfing.com/_next/static/chunks/6233-4276772c5b8d0986.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/6233-4276772c5b8d0986.js — 200 — 31.8 KiB — 371 ms — h2https://www.couchsurfing.com/_next/static/chunks/main-app-e04c78400793c546.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/main-app-e04c78400793c546.js — 200 — 1.2 KiB — 287 ms — h2https://www.couchsurfing.com/_next/static/chunks/8935-2cfe36a6935c617f.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/8935-2cfe36a6935c617f.js — 200 — 10.6 KiB — 299 ms — h2https://www.couchsurfing.com/_next/static/chunks/3124-dd1bc51ddd4546c7.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/3124-dd1bc51ddd4546c7.js — 200 — 34.3 KiB — 391 ms — h2https://www.couchsurfing.com/_next/static/chunks/7577-df79c9f1388ae97d.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/7577-df79c9f1388ae97d.js — 200 — 43.0 KiB — 452 ms — h2https://www.couchsurfing.com/_next/static/chunks/9692-be782428f85590cd.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/9692-be782428f85590cd.js — 200 — 3.4 KiB — 314 ms — h2https://www.couchsurfing.com/_next/static/chunks/1920-5957b0cba15064f8.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/1920-5957b0cba15064f8.js — 200 — 16.0 KiB — 377 ms — h2https://www.couchsurfing.com/_next/static/chunks/1178-e6131d33c2135702.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/1178-e6131d33c2135702.js — 200 — 7.1 KiB — 300 ms — h2https://www.couchsurfing.com/_next/static/chunks/3245-47a96dff739d5867.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/3245-47a96dff739d5867.js — 200 — 8.8 KiB — 310 ms — h2https://www.couchsurfing.com/_next/static/chunks/1286-53c199d3d7e9bf7c.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/1286-53c199d3d7e9bf7c.js — 200 — 45.1 KiB — 449 ms — h2https://www.couchsurfing.com/_next/static/chunks/5212-83caa16a96529908.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/5212-83caa16a96529908.js — 200 — 5.7 KiB — 294 ms — h2https://www.couchsurfing.com/_next/static/chunks/9541-b136ee1f8c04c9bd.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/9541-b136ee1f8c04c9bd.js — 200 — 7.0 KiB — 289 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.3 s LCP 1.6 shttps://couchsurfing.com// https://couchsurfing.com/ — 301 — 89 B — 288 ms — h2https://www.couchsurfing.com/www.couchsurfing.com/ https://www.couchsurfing.com/ — 302 — 1.1 KiB — 331 ms — h2https://www.couchsurfing.com/welcomewww.couchsurfing.com/welcome https://www.couchsurfing.com/welcome — 200 — 36.5 KiB — 831 ms — h2https://www.couchsurfing.com/_next/static/media/155cae559bbd1a77-s.p.woff2www.couchsurfing.com/_next/static/m... https://www.couchsurfing.com/_next/static/media/155cae559bbd1a77-s.p.woff2 — 200 — 14.2 KiB — 361 ms — h2https://www.couchsurfing.com/_next/static/media/4de1fea1a954a5b6-s.p.woff2www.couchsurfing.com/_next/static/m... https://www.couchsurfing.com/_next/static/media/4de1fea1a954a5b6-s.p.woff2 — 200 — 14.3 KiB — 364 ms — h2https://www.couchsurfing.com/_next/static/media/6d664cce900333ee-s.p.woff2www.couchsurfing.com/_next/static/m... https://www.couchsurfing.com/_next/static/media/6d664cce900333ee-s.p.woff2 — 200 — 14.5 KiB — 360 ms — h2https://www.couchsurfing.com/_next/image?url=%2F_next%2Fstatic%2Fmedia%2Flogo-full.b9a1e2af.png&w=128&q=75www.couchsurfing.com/_next/image?ur... https://www.couchsurfing.com/_next/image?url=%2F_next%2Fstatic%2Fmedia%2Flogo-full.b9a1e2af.png&w=128&q=75 — 200 — 4.1 KiB — 288 ms — h2https://www.couchsurfing.com/_next/static/css/18c9f0afcd137cb8.csswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/css/18c9f0afcd137cb8.css — 200 — 3.8 KiB — 284 ms — h2https://www.couchsurfing.com/_next/static/css/a3026e26ffce4ce1.csswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/css/a3026e26ffce4ce1.css — 200 — 4.5 KiB — 276 ms — h2https://www.couchsurfing.com/_next/static/css/09a07f06d80877ff.csswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/css/09a07f06d80877ff.css — 200 — 1.2 KiB — 274 ms — h2https://www.couchsurfing.com/_next/static/css/aa021322dc339b14.csswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/css/aa021322dc339b14.css — 200 — 1.4 KiB — 279 ms — h2https://www.couchsurfing.com/_next/static/css/41e707f4844fd798.csswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/css/41e707f4844fd798.css — 200 — 1.3 KiB — 277 ms — h2https://www.couchsurfing.com/_next/static/css/6cc27ca3e0c8ea92.csswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/css/6cc27ca3e0c8ea92.css — 200 — 969 B — 281 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 63 ms — https://www.couchsurfing.com/_next/static/css/7607cb9e43dac3dc.csswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/css/7607cb9e43dac3dc.css — 200 — 898 B — 285 ms — h2https://www.googletagmanager.com/gtag/js?id=GTM-KC3GXKGwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=GTM-KC3GXKG — 200 — 85.0 KiB — 161 ms — h2https://www.couchsurfing.com/_next/static/chunks/webpack-80301661d555a276.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/webpack-80301661d555a276.js — 200 — 2.8 KiB — 295 ms — h2https://www.couchsurfing.com/_next/static/chunks/cae36a94-de4f6f4a971ae9ca.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/cae36a94-de4f6f4a971ae9ca.js — 200 — 53.3 KiB — 454 ms — h2https://www.couchsurfing.com/_next/static/chunks/6233-4276772c5b8d0986.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/6233-4276772c5b8d0986.js — 200 — 31.8 KiB — 371 ms — h2https://www.couchsurfing.com/_next/static/chunks/main-app-e04c78400793c546.jswww.couchsurfing.com/_next/static/c... 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h2https://www.couchsurfing.com/_next/static/chunks/1920-5957b0cba15064f8.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/1920-5957b0cba15064f8.js — 200 — 16.0 KiB — 377 ms — h2https://www.couchsurfing.com/_next/static/chunks/1178-e6131d33c2135702.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/1178-e6131d33c2135702.js — 200 — 7.1 KiB — 300 ms — h2https://www.couchsurfing.com/_next/static/chunks/3245-47a96dff739d5867.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/3245-47a96dff739d5867.js — 200 — 8.8 KiB — 310 ms — h2https://www.couchsurfing.com/_next/static/chunks/1286-53c199d3d7e9bf7c.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/1286-53c199d3d7e9bf7c.js — 200 — 45.1 KiB — 449 ms — h2https://www.couchsurfing.com/_next/static/chunks/5212-83caa16a96529908.jswww.couchsurfing.com/_next/static/c... 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h2https://www.couchsurfing.com/_next/static/chunks/4978-b146a1373fdd96bb.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/4978-b146a1373fdd96bb.js — 200 — 20.1 KiB — 454 ms — h2https://www.couchsurfing.com/_next/static/chunks/app/layout-9d9e2e66de8d705c.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/app/layout-9d9e2e66de8d705c.js — 200 — 3.8 KiB — 377 ms — h2https://www.couchsurfing.com/_next/static/media/home-background.b3440192.pngwww.couchsurfing.com/_next/static/m... https://www.couchsurfing.com/_next/static/media/home-background.b3440192.png — 200 — 22.7 KiB — 350 ms — h2https://www.couchsurfing.com/_next/static/media/155cae559bbd1a77-s.p.woff2www.couchsurfing.com/_next/static/m... https://www.couchsurfing.com/_next/static/media/155cae559bbd1a77-s.p.woff2 — 200 — 14.2 KiB — 193 ms — h2https://www.couchsurfing.com/_next/static/media/4de1fea1a954a5b6-s.p.woff2www.couchsurfing.com/_next/static/m... 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h2https://www.couchsurfing.com/_next/static/chunks/7155.bbecb3e8c88c2350.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/7155.bbecb3e8c88c2350.js — 200 — 1.3 KiB — 269 ms — h2https://www.couchsurfing.com/_next/static/chunks/8985.97f64bd1f1886da8.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/8985.97f64bd1f1886da8.js — 200 — 1.3 KiB — 272 ms — h2https://www.couchsurfing.com/_next/static/chunks/992.7b80306802e09fea.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/992.7b80306802e09fea.js — 200 — 1.8 KiB — 107 ms — h2https://www.couchsurfing.com/_next/static/chunks/2144.5a1af7e541bfed37.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/2144.5a1af7e541bfed37.js — 200 — 1.4 KiB — 270 ms — h2https://www.couchsurfing.com/_next/static/chunks/3459.e2bd73fca10fb51d.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/3459.e2bd73fca10fb51d.js — 200 — 1.5 KiB — 272 ms — h2https://www.couchsurfing.com/api/signup/trpc/session.signUpData?batch=1&input=%7B%220%22%3A%7B%22json%22%3Anull%2C%22meta%22%3A%7B%22values%22%3A%5B%22undefined%22%5D%7D%7D%7Dwww.couchsurfing.com/api/signup/trp... https://www.couchsurfing.com/api/signup/trpc/session.signUpData?batch=1&input=%7B%220%22%3A%7B%22json%22%3Anull%2C%22meta%22%3A%7B%22values%22%3A%5B%22undefined%22%5D%7D%7D%7D — 200 — 661 B — 106 ms — h2https://www.couchsurfing.com/_next/static/chunks/540.56e7f025c41fe884.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/540.56e7f025c41fe884.js — 200 — 1.4 KiB — 107 ms — h2https://static.hotjar.com/c/hotjar-5054013.js?sv=6static.hotjar.com/c/hotjar-5054013.... https://static.hotjar.com/c/hotjar-5054013.js?sv=6 — 200 — 6.2 KiB — 56 ms — h2https://www.couchsurfing.com/_next/static/chunks/6472.979f65e4eacac81f.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/6472.979f65e4eacac81f.js — 200 — 45.4 KiB — 193 ms — h2https://www.couchsurfing.com/_next/static/chunks/4903.8c08137e62709493.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/4903.8c08137e62709493.js — 200 — 1011 B — 108 ms — h2https://connect.facebook.net/en_US/sdk.jsconnect.facebook.net/en_US/sdk.js https://connect.facebook.net/en_US/sdk.js — 200 — 5.0 KiB — 39 ms — h3https://script.hotjar.com/modules.6a0f3932cb1341a35c18.jsscript.hotjar.com/modules.6a0f3932c... https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js — 200 — 56.6 KiB — 73 ms — h2https://connect.facebook.net/en_US/bundle/sdk.js/connect.facebook.net/en_US/bundle/s... https://connect.facebook.net/en_US/bundle/sdk.js/ — 200 — 77.8 KiB — 9 ms — h3https://rest.iad-05.braze.com/api/v3/data/rest.iad-05.braze.com/api/v3/data/ https://rest.iad-05.braze.com/api/v3/data/ — 200 — 0 B — 167 ms — h2https://www.couchsurfing.com/_next/static/chunks/1097.a422d0368bd2baf2.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/1097.a422d0368bd2baf2.js — 200 — 3.5 KiB — 107 ms — h2https://www.couchsurfing.com/icon.ico?92c0960e5187896dwww.couchsurfing.com/icon.ico?92c09... https://www.couchsurfing.com/icon.ico?92c0960e5187896d — 404 — 24.9 KiB — 132 ms — h2https://rest.iad-05.braze.com/api/v3/data/rest.iad-05.braze.com/api/v3/data/ https://rest.iad-05.braze.com/api/v3/data/ — 404 — 396 B — 152 ms — h2https://www.couchsurfing.com/favicon.icowww.couchsurfing.com/favicon.ico https://www.couchsurfing.com/favicon.ico — 302 — 1.2 KiB — 243 ms — h2https://ht-assets.couchsurfing.com/assets/favicon-2d1bc6a492a3e2abf369090a290ff99b7cc6c163b9a2bef0f41cd5f4cbbe139d.icoht-assets.couchsurfing.com/assets/f... https://ht-assets.couchsurfing.com/assets/favicon-2d1bc6a492a3e2abf369090a290ff99b7cc6c163b9a2bef0f41cd5f4cbbe139d.ico — 200 — 6.8 KiB — 58 ms — h2https://api2.amplitude.com/2/httpapiapi2.amplitude.com/2/httpapi https://api2.amplitude.com/2/httpapi — 200 — 0 B — 551 ms — h2https://api2.amplitude.com/2/httpapiapi2.amplitude.com/2/httpapi https://api2.amplitude.com/2/httpapi — 200 — 217 B — 188 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 397ms · 111KB · €4/mo
www.couchsurfing.com
Other
Optional
Execution 171ms
Transfer 32 KB
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 87ms
Transfer 0 KB
Monthly Cost €1/mo
www.couchsurfing.com
Other
Optional
Execution 79ms
Transfer 37 KB
Monthly Cost €1/mo
www.couchsurfing.com
Other
Optional
Execution 60ms
Transfer 43 KB
Monthly Cost €1/mo

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

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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