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https://www.pinterest.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
66
GRADE
D
FIX
5
REVIEW
2
PASS
5
INFO
2

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

Mobile Desktop
49
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
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.

2.34 s

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

3.49 s

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

369 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.

3.14 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.

5.28 s

Page Load Progression

739 ms
1.5 s
2.2 s
3.0 s
3.7 s
4.4 s
5.2 s
5.9 s
Checks
14
5 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
5.4 MB transferred, 153 requests
FIX
5.4 MB transferred, 153 requests
Critical::
Page weighs 14.3 MB (5.4 MB transferred)
Warning::
JavaScript is 2.9 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.9 MB
Warning::
Images are 2.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.1 MB
Warning::
153 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.1 g CO2 per page load
5.4 MB / 2.4 MB budget
5.4 MB transferred
153 requests
1.1 g CO2 per page load
JavaScript 2.9 MiB 53%
Images 2.1 MiB 39%
HTML 177.8 KiB 3%
Fonts 170.8 KiB 3%
CSS 44.2 KiB 1%
Other 12.6 KiB 0%
Other 8.0 KiB 0%
Other 4.4 KiB 0%
Other 495 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

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
98% third-party, 0 ms blocking
FIX
98% third-party, 0 ms blocking
Warning::
Third-party code accounts for 98% of page weight (5.3 MiB of 5.4 MiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
D
JS Execution Cost
Action
3079ms total JS execution
FIX
3079ms total JS execution
Warning::
https://s.pinimg.com/webapp/www/_client-73b0673355...: 1382ms CPU time
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 506ms CPU time
Warning::
Unattributable: 472ms CPU time
Info::
https://www.pinterest.com/: 228ms CPU time
Info::
https://s.pinimg.com/webapp/31320-2f5f600dacb7eabb...: 140ms CPU time
Warning::
Third-party scripts: 2851ms (93% of total)

Main Thread Breakdown

Script Evaluation 60% Other 17% Script Parsing & Compilation 13% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
https://s.pinimg.com/webapp/www/_client-73b067335506c6f8.mjs1382ms1180ms52ms3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js506ms449ms43ms3rd
Unattributable472ms12ms0ms3rd
https://www.pinterest.com/228ms14ms4ms1st
https://s.pinimg.com/webapp/31320-2f5f600dacb7eabb.mjs140ms72ms1ms3rd
https://s.pinimg.com/webapp/18324-f75b500bbaa8e30e.mjs130ms100ms29ms3rd
https://accounts.google.com/gsi/client?hl=en88ms74ms10ms3rd
https://s.pinimg.com/webapp/vendor-react-2ebd5ce9b89d368c.mjs78ms45ms18ms3rd
https://connect.facebook.net/en_US/bundle/sdk.js/55ms41ms12ms3rd
F
JS Bundles
Action
76 scripts, 1.3 MB unused
FIX
76 scripts, 1.3 MB unused
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 162 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 162 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 162 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s.pinimg.com/webapp/www/_client-73b0673355...: 158 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s.pinimg.com/webapp/10104-6b462117467ca79e...: 64 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.3 MB
1342 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js0 KB162 KB (45%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js363 KB162 KB (45%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js363 KB162 KB (45%)✓3rd
https://s.pinimg.com/webapp/www/_client-73b067335506c6f8.mjs265 KB158 KB (60%)✓3rd
https://s.pinimg.com/webapp/10104-6b462117467ca79e.mjs101 KB64 KB (64%)✓3rd
https://accounts.google.com/gsi/client?hl=en93 KB63 KB (68%)✓3rd
https://s.pinimg.com/webapp/gestalt-247170b7a74e194c.mjs137 KB63 KB (46%)✓3rd
https://s.pinimg.com/webapp/vendor-react-2ebd5ce9b89d368c.mjs114 KB58 KB (51%)✓3rd
https://s.pinimg.com/webapp/app-www-homepage-DesktopInspiredWallSignup-a2153d968e221e6b.mjs68 KB54 KB (80%)✓3rd
https://s.pinimg.com/webapp/51405-76ae5359063ab8d4.mjs63 KB54 KB (87%)✓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
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
50 images, 0 KB saveable
REVIEW
50 images, 0 KB saveable
Info::
All images are well-optimized
50 images 2.1 MB
0 oversized -0 KB
49 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
6 fonts (171 KB)
PASS
6 fonts (171 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

171 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 FCP 2.3 s LCP 3.5 shttps://s.pinimg.com/webapp/Pin-Sans-MacOS-Regular-708c49dd.woff2Pin-Sans-MacOS-Regular-... https://s.pinimg.com/webapp/Pin-Sans-MacOS-Regular-708c49dd.woff2 — 19.8 KiB — 0 ms — font-display: swaphttps://s.pinimg.com/webapp/Pin-Sans-MacOS-Medium-704a4f34.woff2Pin-Sans-MacOS-Medium-7... https://s.pinimg.com/webapp/Pin-Sans-MacOS-Medium-704a4f34.woff2 — 19.8 KiB — 0 ms — font-display: swaphttps://s.pinimg.com/webapp/Pin-Sans-MacOS-Bold-ce475d98.woff2Pin-Sans-MacOS-Bold-ce4... https://s.pinimg.com/webapp/Pin-Sans-MacOS-Bold-ce475d98.woff2 — 19.9 KiB — 0 ms — font-display: swaphttps://s.pinimg.com/webapp/Pin-Sans-MacOS-Heavy-2b6abf8c.woff2Pin-Sans-MacOS-Heavy-2b... https://s.pinimg.com/webapp/Pin-Sans-MacOS-Heavy-2b6abf8c.woff2 — 23.5 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/googlesans/v62/4UaRrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iq2vgCIhM907w.woff24UaRrENHsxJlGDuGo1OIlJf... https://fonts.gstatic.com/s/googlesans/v62/4UaRrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iq2vgCIhM907w.woff2 — 53.9 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 0 ms — font-display: swap
Pin-Sans-MacOS-Regular-... woff2 swap
Size 20 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Pin-Sans-MacOS-Medium-7... woff2 swap
Size 20 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Pin-Sans-MacOS-Bold-ce4... woff2 swap
Size 20 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Pin-Sans-MacOS-Heavy-2b... woff2 swap
Size 24 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
4UaRrENHsxJlGDuGo1OIlJf... woff2 swap
Size 54 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 0 ms
Start 0 ms
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
Network Waterfall
153 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
93% of JavaScript execution is third-party
First-party Third-party 2851ms · 902KB · $38/mo
s.pinimg.com
Other
Costly
Execution 1382ms
Transfer 265 KB
Unused 60%
Monthly Cost $18/mo
www.gstatic.com
Other
Costly
Execution 506ms
Transfer 0 KB
Unused 45%
Monthly Cost $7/mo
Unattributable
Other
Costly
Execution 472ms
Transfer 0 KB
Monthly Cost $6/mo
s.pinimg.com
Other
Optional
Execution 140ms
Transfer 11 KB
Monthly Cost $2/mo
s.pinimg.com
Other
Optional
Execution 130ms
Transfer 341 KB
Monthly Cost $2/mo
accounts.google.com
Other
Optional
Execution 88ms
Transfer 93 KB
Unused 68%
Monthly Cost $1/mo
s.pinimg.com
Other
Optional
Execution 78ms
Transfer 114 KB
Unused 51%
Monthly Cost $1/mo
Facebook Pixel
Advertising
Optional
Execution 55ms
Transfer 78 KB
Unused 63%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • s.pinimg.com adds 1382ms and costs ~$18/month
  • www.gstatic.com adds 506ms and costs ~$7/month
  • Unattributable adds 472ms and costs ~$6/month

93% 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

s.pinimg.com takes 1382ms 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 s.pinimg.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

www.gstatic.com takes 506ms 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 472ms 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

68% of accounts.google.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

51% of s.pinimg.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

63% 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

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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