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https://allbirds.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
66
GRADE
D
FIX
5
REVIEW
1
PASS
6
INFO
2

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

Mobile Desktop
25
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.

6.99 s

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

22.40 s

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

5.27 s

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

0.026

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

14.08 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.

36.27 s

Page Load Progression

880 ms
1.8 s
2.6 s
3.5 s
4.4 s
5.3 s
6.2 s
7.0 s
Checks
14
6 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
8.4 MB transferred, 312 requests
FIX
8.4 MB transferred, 312 requests
Critical::
Page weighs 13.5 MB (8.4 MB transferred)
Warning::
Images are 4.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.7 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::
312 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.8 g CO2 per page load
8.4 MB / 2.4 MB budget
8.4 MB transferred
312 requests
1.8 g CO2 per page load
Images 4.7 MiB 56%
JavaScript 2.1 MiB 25%
Other 1.0 MiB 12%
HTML 299.9 KiB 3%
Fonts 203.3 KiB 2%
Other 74.7 KiB 1%
Other 7.6 KiB 0%
CSS 6.3 KiB 0%
Other 6.1 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 (8.4 MiB of 8.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
22539ms total JS execution
FIX
22539ms total JS execution
Warning::
https://cdn.trackjs.com/agent/v3/latest/t.js: 4488ms CPU time
Warning::
https://www.allbirds.com/cdn/shop/t/4054/assets/Sc...: 3153ms CPU time
Warning::
Unattributable: 2834ms CPU time
Warning::
https://www.allbirds.com/: 2327ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WWZ...: 946ms CPU time
Warning::
Third-party scripts: 22539ms (100% of total)

Main Thread Breakdown

Script Evaluation 55% Other 22% Style & Layout 10% Script Parsing & Compilation 5% Parse HTML & CSS 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://cdn.trackjs.com/agent/v3/latest/t.js4488ms3311ms5ms3rd
https://www.allbirds.com/cdn/shop/t/4054/assets/ScrollTrigger.js3153ms571ms2ms3rd
Unattributable2834ms172ms0ms3rd
https://www.allbirds.com/2327ms175ms47ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WWZFMZRX946ms823ms112ms3rd
https://id-shop.govx.com/app/weareallbirds.myshopify.com/govx.js?shop=weareallbirds.myshopify.com862ms858ms3ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TH8KRSBJ823ms678ms134ms3rd
https://popupform.allbirds.com/w37htfhcq2/vendor/f0ff0959-79f9-4c1e-a197-0361a8f1cbb2/main.js?cb=82886068C4DADB1CB2033C792466D591796ms629ms74ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-935878905&cx=c&gtm=4e6411595ms424ms81ms3rd
https://www.googletagmanager.com/gtag/destination?id=G-KB1068K0E6&cx=c&gtm=4e6411565ms467ms92ms3rd

Showing top 10 of 29 scripts

F
JS Bundles
Action
167 scripts, 721 KB unused
FIX
167 scripts, 721 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TH8...: 76 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://popupform.allbirds.com/w37htfhcq2/vendor/f...: 68 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 67 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-736...: 64 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-786...: 63 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 721 KB
721 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-TH8KRSBJ182 KB76 KB (42%)✓3rd
https://popupform.allbirds.com/w37htfhcq2/vendor/f0ff0959-79f9-4c1e-a197-0361a8f1cbb2/main.js?cb=82886068C4DADB1CB2033C792466D591116 KB68 KB (59%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=G-KB1068K0E6&cx=c&gtm=4e6411168 KB67 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-736740096&cx=c&gtm=4e6420h2144 KB64 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-786649265&cx=c&gtm=4e6420h2144 KB63 KB (44%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-935878905&cx=c&gtm=4e6411144 KB63 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-WWZFMZRX154 KB59 KB (38%)✓3rd
https://superfiliate-cdn.com/storefront.js?shop=weareallbirds.myshopify.com81 KB54 KB (67%)✓3rd
https://www.allbirds.com/cdn/shop/t/4054/assets/theme2.js34 KB26 KB (78%)✓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
64 images, 0 KB saveable
REVIEW
64 images, 0 KB saveable
Info::
All images are well-optimized
64 images 4.7 MB
0 oversized -0 KB
16 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
8 fonts (273 KB)
PASS
8 fonts (273 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

273 KB total

Render-blocking

0

of 8

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 FCP 7.0 s LCP 22.4 shttps://www.allbirds.com/cdn/shop/t/4054/assets/geograph-regular.woff2geograph-regular.woff2 https://www.allbirds.com/cdn/shop/t/4054/assets/geograph-regular.woff2 — 34.3 KiB — 0 ms — font-display: swaphttps://www.allbirds.com/cdn/shop/t/4054/assets/self-modern_regular_web.woff2self-modern_regular_web... https://www.allbirds.com/cdn/shop/t/4054/assets/self-modern_regular_web.woff2 — 24.6 KiB — 0 ms — font-display: swaphttps://www.allbirds.com/cdn/shop/t/4054/assets/akkurat-mono.woff2akkurat-mono.woff2 https://www.allbirds.com/cdn/shop/t/4054/assets/akkurat-mono.woff2 — 10.9 KiB — 0 ms — font-display: swaphttps://www.allbirds.com/cdn/shop/t/4054/assets/geograph-medium.woff2geograph-medium.woff2 https://www.allbirds.com/cdn/shop/t/4054/assets/geograph-medium.woff2 — 34.9 KiB — 0 ms — font-display: swaphttps://www.allbirds.com/cdn/shop/t/4054/assets/geograph-bold.woff2geograph-bold.woff2 https://www.allbirds.com/cdn/shop/t/4054/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: swaphttps://cdn.shopify.com/s/files/1/1104/4168/files/geograph-regular_8e9ffb2c-0e1f-4f0c-96be-aad7e378d3b3.woff2?v=1719584207geograph-regular_8e9ffb... https://cdn.shopify.com/s/files/1/1104/4168/files/geograph-regular_8e9ffb2c-0e1f-4f0c-96be-aad7e378d3b3.woff2?v=1719584207 — 34.3 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/s/files/1/1104/4168/files/geograph-bold_769abb60-0752-447c-9785-bbbafeaf12c6.woff2?v=1719584207geograph-bold_769abb60-... https://cdn.shopify.com/s/files/1/1104/4168/files/geograph-bold_769abb60-0752-447c-9785-bbbafeaf12c6.woff2?v=1719584207 — 35.2 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
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
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
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
geograph-regular_8e9ffb... woff2 swap
Size 34 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
geograph-bold_769abb60-... woff2 swap
Size 35 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+
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
312 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 22539ms · 1782KB · $129/mo
cdn.trackjs.com
Other
Costly
Execution 4488ms
Transfer 11 KB
Monthly Cost $26/mo
www.allbirds.com
Other
Costly
Execution 3153ms
Transfer 65 KB
Unused 35%
Monthly Cost $18/mo
Unattributable
Other
Costly
Execution 2834ms
Transfer 0 KB
Monthly Cost $16/mo
www.allbirds.com
Other
Costly
Execution 2327ms
Transfer 109 KB
Monthly Cost $13/mo
Google Tag Manager
Tag Manager
Costly
Execution 946ms
Transfer 154 KB
Unused 38%
Monthly Cost $5/mo
id-shop.govx.com
Other
Costly
Execution 862ms
Transfer 7 KB
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 823ms
Transfer 182 KB
Unused 42%
Monthly Cost $5/mo
popupform.allbirds.com
Other
Costly
Execution 796ms
Transfer 116 KB
Unused 59%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 595ms
Transfer 144 KB
Unused 44%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 565ms
Transfer 168 KB
Unused 40%
Monthly Cost $3/mo
OneTrust
Consent
Essential
Execution 559ms
Transfer 120 KB
Unused 52%
Monthly Cost $3/mo
cdn.gladly.com
Other
Costly
Execution 525ms
Transfer 43 KB
Monthly Cost $3/mo
jssdk.allbirds.com
Other
Costly
Execution 486ms
Transfer 31 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 483ms
Transfer 144 KB
Unused 45%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 439ms
Transfer 144 KB
Unused 44%
Monthly Cost $3/mo
Amplitude
Analytics
Costly
Execution 425ms
Transfer 43 KB
Unused 53%
Monthly Cost $2/mo
www.allbirds.com
Other
Costly
Execution 388ms
Transfer 58 KB
Unused 45%
Monthly Cost $2/mo
beacon.riskified.com
Other
Costly
Execution 256ms
Transfer 17 KB
Monthly Cost $1/mo
www.allbirds.com
Other
Costly
Execution 256ms
Transfer 2 KB
Monthly Cost $1/mo
www.allbirds.com
Other
Costly
Execution 255ms
Transfer 21 KB
Monthly Cost $1/mo
www.allbirds.com
Other
Optional
Execution 175ms
Transfer 31 KB
Monthly Cost $1/mo
superfiliate-cdn.com
Other
Optional
Execution 154ms
Transfer 81 KB
Unused 67%
Monthly Cost $1/mo
www.allbirds.com
Other
Optional
Execution 152ms
Transfer 23 KB
Monthly Cost $1/mo
www.allbirds.com
Other
Optional
Execution 137ms
Transfer 21 KB
Monthly Cost $1/mo
www.allbirds.com
Other
Optional
Execution 134ms
Transfer 27 KB
Monthly Cost $1/mo
www.allbirds.com
Other
Optional
Execution 101ms
Transfer 4 KB
Monthly Cost $1/mo
cdn.gladly.com
Other
Optional
Execution 98ms
Transfer 0 KB
Monthly Cost $1/mo
www.allbirds.com
Other
Optional
Execution 71ms
Transfer 7 KB
Monthly Cost $0/mo
OneTrust
Consent
Essential
Execution 56ms
Transfer 9 KB
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • cdn.trackjs.com adds 4488ms and costs ~$26/month
  • www.allbirds.com adds 3153ms and costs ~$18/month
  • Unattributable adds 2834ms and costs ~$16/month
  • www.allbirds.com adds 2327ms and costs ~$13/month
  • Google Tag Manager adds 946ms and costs ~$5/month
  • id-shop.govx.com adds 862ms and costs ~$5/month
  • Google Tag Manager adds 823ms and costs ~$5/month
  • popupform.allbirds.com adds 796ms and costs ~$5/month
  • Google Tag Manager adds 595ms and costs ~$3/month
  • Google Tag Manager adds 565ms and costs ~$3/month
  • cdn.gladly.com adds 525ms and costs ~$3/month
  • jssdk.allbirds.com adds 486ms and costs ~$3/month
  • Google Tag Manager adds 483ms and costs ~$3/month
  • Google Tag Manager adds 439ms and costs ~$3/month
  • Amplitude adds 425ms and costs ~$2/month
  • www.allbirds.com adds 388ms and costs ~$2/month
  • beacon.riskified.com adds 256ms and costs ~$1/month
  • www.allbirds.com adds 256ms and costs ~$1/month
  • www.allbirds.com adds 255ms 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

cdn.trackjs.com takes 4488ms 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 3153ms 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 2834ms 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

Google Tag Manager takes 946ms 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

id-shop.govx.com takes 862ms 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 823ms 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 796ms 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 595ms 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 565ms 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

cdn.gladly.com takes 525ms 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

jssdk.allbirds.com takes 486ms 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 483ms 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 439ms 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 425ms 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

53% of Amplitude'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.allbirds.com takes 388ms 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 256ms 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 256ms 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 255ms 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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