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https://couchsurfing.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
3
REVIEW
2
PASS
10
INFO
2

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

Mobile Desktop
59
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.

3.27 s

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

5.82 s

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

524 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.

3.27 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.

8.70 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
10 PASS 2 REVIEW 3 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 (849.4 KiB of 849.5 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2116ms total JS execution
FIX
2116ms total JS execution
Warning::
https://www.couchsurfing.com/_next/static/chunks/6...: 546ms CPU time
Warning::
Unattributable: 390ms CPU time
Warning::
https://www.couchsurfing.com/welcome: 387ms CPU time
Info::
https://www.couchsurfing.com/_next/static/chunks/1...: 238ms CPU time
Info::
https://script.hotjar.com/modules.6a0f3932cb1341a3...: 172ms CPU time
Warning::
Third-party scripts: 2116ms (100% of total)

Main Thread Breakdown

Script Evaluation 56% Other 20% Style & Layout 10% Script Parsing & Compilation 9%
ScriptTotalScriptingParse/CompileParty
https://www.couchsurfing.com/_next/static/chunks/6233-4276772c5b8d0986.js546ms511ms13ms3rd
Unattributable390ms11ms0ms3rd
https://www.couchsurfing.com/welcome387ms11ms19ms3rd
https://www.couchsurfing.com/_next/static/chunks/1286-53c199d3d7e9bf7c.js238ms212ms14ms3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js172ms148ms19ms3rd
https://www.couchsurfing.com/_next/static/chunks/6472.979f65e4eacac81f.js134ms112ms14ms3rd
https://www.couchsurfing.com/_next/static/chunks/cae36a94-de4f6f4a971ae9ca.js113ms93ms18ms3rd
https://connect.facebook.net/en_US/bundle/sdk.js/76ms54ms21ms3rd
https://www.googletagmanager.com/gtag/js?id=GTM-KC3GXKG61ms42ms18ms3rd
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
850 KB transferred, 69 requests
PASS
850 KB transferred, 69 requests
Info::
Page weighs 2.3 MB (850 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::
69 HTTP requests
Info::
Estimated 0.17 g CO2 per page load
850 KB / 2.4 MB budget
850 KB transferred
69 requests
0.17 g CO2 per page load
JavaScript 646.4 KiB 76%
Fonts 86.0 KiB 10%
HTML 36.6 KiB 4%
Other 34.1 KiB 4%
Images 31.3 KiB 4%
CSS 14.0 KiB 2%
Other 880 B 0%
Other 373 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
4 images, 0 KB saveable
PASS
4 images, 0 KB saveable
Info::
All images are well-optimized
4 images 31 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 3.3 s LCP 5.8 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 — 362 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 — 365 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 — 354 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 — 356 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 — 352 ms — font-display: swap
155cae559bbd1a77-s.p.woff2 woff2 swap
Size 14 KB
Load time 362 ms
Start 690 ms
Risk FOUT — text flashes from fallback to web font
4de1fea1a954a5b6-s.p.woff2 woff2 swap
Size 14 KB
Load time 364 ms
Start 691 ms
Risk FOUT — text flashes from fallback to web font
6d664cce900333ee-s.p.woff2 woff2 swap
Size 14 KB
Load time 365 ms
Start 691 ms
Risk FOUT — text flashes from fallback to web font
155cae559bbd1a77-s.p.woff2 woff2 swap
Size 14 KB
Load time 354 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
4de1fea1a954a5b6-s.p.woff2 woff2 swap
Size 14 KB
Load time 356 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
6d664cce900333ee-s.p.woff2 woff2 swap
Size 14 KB
Load time 352 ms
Start 1.2 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
—
preload
6
dns-prefetch
—
prefetch
—

6 resource hints configured

A
Page Weight Inventory
69 resources · 850 KB · 192 KB savings available
PASS
69 resources · 850 KB · 192 KB savings available
Info::
Within 1MB page-weight target
Got: 850 KB
Info::
~192 KB of savings available
Warning::
68 third-party resources (100% of weight)
69 resources · 849.5 KiB · 68 third-party Within 1MB page-weight target
JavaScript 76% · 646.4 KiB
Font 10% · 86.0 KiB
Document 8% · 63.9 KiB
Image 4% · 38.1 KiB
CSS 2% · 14.0 KiB
Other 0% · 1.2 KiB

~192.2 KiB of savings available

Remove unused JavaScript: 192.2 KiB
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
69 requests over 3181ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 3.3 s LCP 5.8 shttps://couchsurfing.com// https://couchsurfing.com/ — 301 — 89 B — 294 ms — h2https://www.couchsurfing.com/www.couchsurfing.com/ https://www.couchsurfing.com/ — 302 — 1.1 KiB — 179 ms — h2https://www.couchsurfing.com/welcomewww.couchsurfing.com/welcome https://www.couchsurfing.com/welcome — 200 — 36.6 KiB — 278 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 — 362 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 — 365 ms — h2https://www.couchsurfing.com/_next/image?url=%2F_next%2Fstatic%2Fmedia%2Flogo-full.b9a1e2af.png&w=256&q=75www.couchsurfing.com/_next/image?ur... https://www.couchsurfing.com/_next/image?url=%2F_next%2Fstatic%2Fmedia%2Flogo-full.b9a1e2af.png&w=256&q=75 — 200 — 3.8 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 — 287 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 — 278 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 — 288 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 — 967 B — 275 ms — h2https://www.couchsurfing.com/_next/static/css/7607cb9e43dac3dc.csswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/css/7607cb9e43dac3dc.css — 200 — 897 B — 278 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 102 ms — https://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 — 175 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 — 272 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 — 456 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 — 386 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 — 288 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 — 296 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 — 374 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 — 447 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 — 298 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 — 383 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 — 296 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 — 294 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 — 454 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 — 309 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 — 305 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 3.3 s LCP 5.8 shttps://couchsurfing.com// https://couchsurfing.com/ — 301 — 89 B — 294 ms — h2https://www.couchsurfing.com/www.couchsurfing.com/ https://www.couchsurfing.com/ — 302 — 1.1 KiB — 179 ms — h2https://www.couchsurfing.com/welcomewww.couchsurfing.com/welcome https://www.couchsurfing.com/welcome — 200 — 36.6 KiB — 278 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 — 362 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 — 365 ms — h2https://www.couchsurfing.com/_next/image?url=%2F_next%2Fstatic%2Fmedia%2Flogo-full.b9a1e2af.png&w=256&q=75www.couchsurfing.com/_next/image?ur... https://www.couchsurfing.com/_next/image?url=%2F_next%2Fstatic%2Fmedia%2Flogo-full.b9a1e2af.png&w=256&q=75 — 200 — 3.8 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 — 287 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 — 278 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 — 288 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 — 967 B — 275 ms — h2https://www.couchsurfing.com/_next/static/css/7607cb9e43dac3dc.csswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/css/7607cb9e43dac3dc.css — 200 — 897 B — 278 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 102 ms — 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h2https://www.couchsurfing.com/_next/image?url=%2F_next%2Fstatic%2Fmedia%2Fgoogle-play-store.58f56670.png&w=384&q=75www.couchsurfing.com/_next/image?ur... https://www.couchsurfing.com/_next/image?url=%2F_next%2Fstatic%2Fmedia%2Fgoogle-play-store.58f56670.png&w=384&q=75 — 200 — 2.3 KiB — 270 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 — 354 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 — 356 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 — 352 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 — 663 B — 275 ms — h2https://www.couchsurfing.com/_next/static/chunks/app/not-found-d1b626717ee0e21c.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/app/not-found-d1b626717ee0e21c.js — 200 — 1.4 KiB — 110 ms — h2https://www.couchsurfing.com/_next/static/chunks/4102.340c4553de958c65.jswww.couchsurfing.com/_next/static/c... https://www.couchsurfing.com/_next/static/chunks/4102.340c4553de958c65.js — 200 — 1.3 KiB — 274 ms — h2https://www.couchsurfing.com/_next/static/chunks/1463.89712aad4a6942d8.jswww.couchsurfing.com/_next/static/c... 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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 — 270 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 — 109 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 — 142 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 — 268 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 — 1010 B — 106 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 — 44 ms — h3https://script.hotjar.com/modules.6a0f3932cb1341a35c18.jsscript.hotjar.com/modules.6a0f3932c... https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js — 200 — 56.6 KiB — 119 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 — 10 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 — 272 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 — 104 ms — h2https://www.couchsurfing.com/icon.ico?92c0960e5187896dwww.couchsurfing.com/icon.ico?92c09... https://www.couchsurfing.com/icon.ico?92c0960e5187896d — 404 — 24.9 KiB — 133 ms — h2https://www.couchsurfing.com/favicon.icowww.couchsurfing.com/favicon.ico https://www.couchsurfing.com/favicon.ico — 302 — 1.2 KiB — 127 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 — 373 B — 132 ms — h2https://api2.amplitude.com/2/httpapiapi2.amplitude.com/2/httpapi https://api2.amplitude.com/2/httpapi — 200 — 0 B — 575 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 — 63 ms — h2https://api2.amplitude.com/2/httpapiapi2.amplitude.com/2/httpapi https://api2.amplitude.com/2/httpapi — 200 — 217 B — 200 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 2116ms · 432KB · €23/mo
www.couchsurfing.com
Other
Costly
Execution 546ms
Transfer 32 KB
Monthly Cost €6/mo
Unattributable
Other
Costly
Execution 390ms
Transfer 0 KB
Monthly Cost €4/mo
www.couchsurfing.com
Other
Costly
Execution 387ms
Transfer 37 KB
Monthly Cost €4/mo
www.couchsurfing.com
Other
Costly
Execution 238ms
Transfer 45 KB
Unused 55%
Monthly Cost €3/mo
Hotjar
Session Replay
Optional
Execution 172ms
Transfer 57 KB
Unused 67%
Monthly Cost €2/mo
www.couchsurfing.com
Other
Optional
Execution 134ms
Transfer 45 KB
Unused 46%
Monthly Cost €1/mo
www.couchsurfing.com
Other
Optional
Execution 113ms
Transfer 53 KB
Monthly Cost €1/mo
Facebook Pixel
Advertising
Optional
Execution 76ms
Transfer 78 KB
Unused 70%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 61ms
Transfer 85 KB
Unused 65%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.couchsurfing.com adds 546ms and costs ~€6/month
  • Unattributable adds 390ms and costs ~€4/month
  • www.couchsurfing.com adds 387ms and costs ~€4/month
  • www.couchsurfing.com adds 238ms and costs ~€3/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

www.couchsurfing.com takes 546ms 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

Unattributable takes 390ms 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

www.couchsurfing.com takes 387ms 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

www.couchsurfing.com takes 238ms 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

55% of www.couchsurfing.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

67% of Hotjar'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

70% of Facebook Pixel'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

65% of Google Tag Manager'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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