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https://allbirds.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
27
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

5.20 s

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

24.53 s

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

4.40 s

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

0.018

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

11.68 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.

37.62 s

Page Load Progression

894 ms
1.8 s
2.7 s
3.6 s
4.5 s
5.4 s
6.3 s
7.2 s
Checks
16
8 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
16.8 MB transferred, 319 requests
FIX
16.8 MB transferred, 319 requests
Critical::
Page weighs 22.1 MB (16.8 MB transferred)
Warning::
Images are 5.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.3 MB
Warning::
JavaScript is 2.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.1 MB
Info::
Fonts are 203 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 203 KB
Warning::
319 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 3.5 g CO2 per page load
16.8 MB / 2.4 MB budget
16.8 MB transferred
319 requests
3.5 g CO2 per page load
Other 7.9 MiB 47%
Images 5.3 MiB 31%
JavaScript 2.1 MiB 13%
Other 895.5 KiB 5%
HTML 300.6 KiB 2%
Fonts 203.4 KiB 1%
Other 74.6 KiB 0%
Other 6.5 KiB 0%
CSS 6.3 KiB 0%
Other 6.2 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (16.8 MiB of 16.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
19229ms total JS execution
FIX
19229ms total JS execution
Warning::
Unattributable: 3416ms CPU time
Warning::
https://www.allbirds.com/: 2327ms CPU time
Warning::
https://www.allbirds.com/cdn/shop/t/4071/assets/Sc...: 2013ms CPU time
Warning::
https://www.allbirds.com/cdn/shop/t/4071/assets/he...: 1311ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-736...: 891ms CPU time
Warning::
Third-party scripts: 19229ms (100% of total)

Main Thread Breakdown

Script Evaluation 54% Other 24% Style & Layout 9% Script Parsing & Compilation 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
Unattributable3416ms190ms0ms3rd
https://www.allbirds.com/2327ms364ms59ms3rd
https://www.allbirds.com/cdn/shop/t/4071/assets/ScrollTrigger.js2013ms798ms1ms3rd
https://www.allbirds.com/cdn/shop/t/4071/assets/header.js1311ms932ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-736740096&cx=c&gtm=4e6461h1891ms812ms70ms3rd
https://popupform.allbirds.com/w37htfhcq2/vendor/f0ff0959-79f9-4c1e-a197-0361a8f1cbb2/main.js?cb=0036016EDAA80E99066F39CFE5BC2BF2780ms533ms69ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TH8KRSBJ635ms528ms98ms3rd
https://www.allbirds.com/cdn/shop/t/4071/assets/footer.js576ms379ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-935878905&cx=c&gtm=4e6461h1505ms430ms70ms3rd
https://cdn.cookielaw.org/scripttemplates/202506.1.0/otBannerSdk.js491ms318ms101ms3rd

Showing top 10 of 37 scripts

F
JS Bundles
Action
167 scripts, 703 KB unused
FIX
167 scripts, 703 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TH8...: 74 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://popupform.allbirds.com/w37htfhcq2/vendor/f...: 69 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 68 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-786...: 64 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-935...: 64 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 703 KB
703 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-TH8KRSBJ182 KB74 KB (41%)✓3rd
https://popupform.allbirds.com/w37htfhcq2/vendor/f0ff0959-79f9-4c1e-a197-0361a8f1cbb2/main.js?cb=0036016EDAA80E99066F39CFE5BC2BF2116 KB69 KB (59%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=G-KB1068K0E6&cx=c&gtm=4e6461h1169 KB68 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-786649265&cx=c&gtm=4e6461h1144 KB64 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-935878905&cx=c&gtm=4e6461h1145 KB64 KB (44%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-736740096&cx=c&gtm=4e6461h1144 KB64 KB (44%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202506.1.0/otBannerSdk.js120 KB63 KB (52%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WWZFMZRX155 KB62 KB (40%)✓3rd
https://superfiliate-cdn.com/storefront.js?shop=weareallbirds.myshopify.com81 KB54 KB (67%)✓3rd
https://www.allbirds.com/cdn/wpm/b0e8c7c7aw41bd75a1p837d7fd4m8b145375m.js61 KB27 KB (46%)✓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

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, no-store

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
no-store—Never cache this response
B
Image Optimization
79 images, 0 KB saveable
REVIEW
79 images, 0 KB saveable
Info::
All images are well-optimized
79 images 5.3 MB
0 oversized -0 KB
14 legacy format
0 missing dimensions CLS risk
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 (203 KB)
PASS
6 fonts (203 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

203 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s FCP 5.2 s LCP 24.5 shttps://www.allbirds.com/cdn/shop/t/4071/assets/geograph-regular.woff2geograph-regular.woff2 https://www.allbirds.com/cdn/shop/t/4071/assets/geograph-regular.woff2 — 34.3 KiB — 0 ms — font-display: swaphttps://www.allbirds.com/cdn/shop/t/4071/assets/akkurat-mono.woff2akkurat-mono.woff2 https://www.allbirds.com/cdn/shop/t/4071/assets/akkurat-mono.woff2 — 10.9 KiB — 0 ms — font-display: swaphttps://www.allbirds.com/cdn/shop/t/4071/assets/geograph-medium.woff2geograph-medium.woff2 https://www.allbirds.com/cdn/shop/t/4071/assets/geograph-medium.woff2 — 34.9 KiB — 0 ms — font-display: swaphttps://www.allbirds.com/cdn/shop/t/4071/assets/self-modern_regular_web.woff2self-modern_regular_web... https://www.allbirds.com/cdn/shop/t/4071/assets/self-modern_regular_web.woff2 — 24.6 KiB — 0 ms — font-display: swaphttps://www.allbirds.com/cdn/shop/t/4071/assets/geograph-bold.woff2geograph-bold.woff2 https://www.allbirds.com/cdn/shop/t/4071/assets/geograph-bold.woff2 — 35.4 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/shop-assets/static_uploads/shoplift/GTStandard-MRegular.woff2GTStandard-MRegular.woff2 https://cdn.shopify.com/shop-assets/static_uploads/shoplift/GTStandard-MRegular.woff2 — 63.2 KiB — 0 ms — font-display: swap
geograph-regular.woff2 woff2 swap
Size 34 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
akkurat-mono.woff2 woff2 swap
Size 11 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
geograph-medium.woff2 woff2 swap
Size 35 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
self-modern_regular_web... woff2 swap
Size 25 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
geograph-bold.woff2 woff2 swap
Size 35 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GTStandard-MRegular.woff2 woff2 swap
Size 63 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
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)

Current Resource Hints

preconnect
2
preload
1
dns-prefetch
2
prefetch
—

5 resource hints configured

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: Cloudflare

Network Waterfall
319 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
100% of JavaScript execution is third-party
First-party Third-party 19229ms · 1817KB · $110/mo
Unattributable
Other
Costly
Execution 3416ms
Transfer 0 KB
Monthly Cost $20/mo
www.allbirds.com
Other
Costly
Execution 2327ms
Transfer 109 KB
Monthly Cost $13/mo
www.allbirds.com
Other
Costly
Execution 2013ms
Transfer 65 KB
Unused 35%
Monthly Cost $12/mo
www.allbirds.com
Other
Costly
Execution 1311ms
Transfer 7 KB
Monthly Cost $8/mo
Google Tag Manager
Tag Manager
Costly
Execution 891ms
Transfer 144 KB
Unused 44%
Monthly Cost $5/mo
popupform.allbirds.com
Other
Costly
Execution 780ms
Transfer 116 KB
Unused 59%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 635ms
Transfer 182 KB
Unused 41%
Monthly Cost $4/mo
www.allbirds.com
Other
Costly
Execution 576ms
Transfer 2 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 505ms
Transfer 145 KB
Unused 44%
Monthly Cost $3/mo
OneTrust
Consent
Essential
Execution 491ms
Transfer 120 KB
Unused 52%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 491ms
Transfer 155 KB
Unused 40%
Monthly Cost $3/mo
www.allbirds.com
Other
Costly
Execution 468ms
Transfer 4 KB
Monthly Cost $3/mo
www.allbirds.com
Other
Costly
Execution 465ms
Transfer 61 KB
Unused 46%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 424ms
Transfer 169 KB
Unused 40%
Monthly Cost $2/mo
cdn.gladly.com
Other
Costly
Execution 414ms
Transfer 43 KB
Monthly Cost $2/mo
cdn.trackjs.com
Other
Costly
Execution 386ms
Transfer 11 KB
Monthly Cost $2/mo
Amplitude
Analytics
Costly
Execution 372ms
Transfer 43 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Costly
Execution 285ms
Transfer 144 KB
Unused 45%
Monthly Cost $2/mo
beacon.riskified.com
Other
Costly
Execution 284ms
Transfer 17 KB
Monthly Cost $2/mo
www.allbirds.com
Other
Costly
Execution 275ms
Transfer 2 KB
Monthly Cost $2/mo
www.allbirds.com
Other
Costly
Execution 250ms
Transfer 2 KB
Monthly Cost $1/mo
www.allbirds.com
Other
Costly
Execution 235ms
Transfer 3 KB
Monthly Cost $1/mo
www.allbirds.com
Other
Costly
Execution 233ms
Transfer 2 KB
Monthly Cost $1/mo
www.allbirds.com
Other
Optional
Execution 187ms
Transfer 28 KB
Monthly Cost $1/mo
www.allbirds.com
Other
Optional
Execution 179ms
Transfer 21 KB
Monthly Cost $1/mo
superfiliate-cdn.com
Other
Optional
Execution 151ms
Transfer 81 KB
Unused 67%
Monthly Cost $1/mo
www.allbirds.com
Other
Optional
Execution 149ms
Transfer 2 KB
Monthly Cost $1/mo
www.allbirds.com
Other
Optional
Execution 145ms
Transfer 21 KB
Monthly Cost $1/mo
jssdk.allbirds.com
Other
Optional
Execution 143ms
Transfer 31 KB
Monthly Cost $1/mo
www.allbirds.com
Other
Optional
Execution 132ms
Transfer 23 KB
Monthly Cost $1/mo
www.allbirds.com
Other
Optional
Execution 115ms
Transfer 14 KB
Monthly Cost $1/mo
www.allbirds.com
Other
Optional
Execution 104ms
Transfer 31 KB
Monthly Cost $1/mo
www.allbirds.com
Other
Optional
Execution 100ms
Transfer 4 KB
Monthly Cost $1/mo
www.allbirds.com
Other
Optional
Execution 91ms
Transfer 2 KB
Monthly Cost $1/mo
OneTrust
Consent
Essential
Execution 85ms
Transfer 9 KB
Monthly Cost $0/mo
www.allbirds.com
Other
Optional
Execution 72ms
Transfer 3 KB
Monthly Cost $0/mo
cdn.gladly.com
Other
Optional
Execution 52ms
Transfer 0 KB
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • Unattributable adds 3416ms and costs ~$20/month
  • www.allbirds.com adds 2327ms and costs ~$13/month
  • www.allbirds.com adds 2013ms and costs ~$12/month
  • www.allbirds.com adds 1311ms and costs ~$8/month
  • Google Tag Manager adds 891ms and costs ~$5/month
  • popupform.allbirds.com adds 780ms and costs ~$4/month
  • Google Tag Manager adds 635ms and costs ~$4/month
  • www.allbirds.com adds 576ms and costs ~$3/month
  • Google Tag Manager adds 505ms and costs ~$3/month
  • Google Tag Manager adds 491ms and costs ~$3/month
  • www.allbirds.com adds 468ms and costs ~$3/month
  • www.allbirds.com adds 465ms and costs ~$3/month
  • Google Tag Manager adds 424ms and costs ~$2/month
  • cdn.gladly.com adds 414ms and costs ~$2/month
  • cdn.trackjs.com adds 386ms and costs ~$2/month
  • Amplitude adds 372ms and costs ~$2/month
  • Google Tag Manager adds 285ms and costs ~$2/month
  • beacon.riskified.com adds 284ms and costs ~$2/month
  • www.allbirds.com adds 275ms and costs ~$2/month
  • www.allbirds.com adds 250ms and costs ~$1/month
  • www.allbirds.com adds 235ms and costs ~$1/month
  • www.allbirds.com adds 233ms and costs ~$1/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

Unattributable takes 3416ms 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.allbirds.com takes 2327ms 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.allbirds.com takes 2013ms 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.allbirds.com takes 1311ms 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

Google Tag Manager takes 891ms 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

popupform.allbirds.com takes 780ms 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

59% of popupform.allbirds.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

Google Tag Manager takes 635ms 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.allbirds.com takes 576ms 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

Google Tag Manager takes 505ms 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

52% of OneTrust'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

Google Tag Manager takes 491ms 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.allbirds.com takes 468ms 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.allbirds.com takes 465ms 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

Google Tag Manager takes 424ms 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

cdn.gladly.com takes 414ms 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

cdn.trackjs.com takes 386ms 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

Amplitude takes 372ms 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

Google Tag Manager takes 285ms 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

beacon.riskified.com takes 284ms 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.allbirds.com takes 275ms 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.allbirds.com takes 250ms 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.allbirds.com takes 235ms 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.allbirds.com takes 233ms 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

67% of superfiliate-cdn.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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