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https://www.brooklinen.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
30
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

1.62 s

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

5.67 s

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

1.56 s

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

0.070

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

7.24 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.

12.14 s

Page Load Progression

2.4 s
4.9 s
7.3 s
9.7 s
12.1 s
14.6 s
17.0 s
19.4 s
Checks
14
6 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
18.0 MB transferred, 727 requests
FIX
18.0 MB transferred, 727 requests
Critical::
Page weighs 32.3 MB (18.0 MB transferred)
Warning::
JavaScript is 4.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 4.2 MB
Warning::
Images are 1.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.6 MB
Info::
Fonts are 258 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 258 KB
Warning::
727 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 3.8 g CO2 per page load
18.0 MB / 2.4 MB budget
18.0 MB transferred
727 requests
3.8 g CO2 per page load
Other 9.6 MiB 53%
JavaScript 4.2 MiB 23%
Images 1.6 MiB 9%
Other 1.1 MiB 6%
HTML 773.4 KiB 4%
Other 341.9 KiB 2%
Fonts 258.4 KiB 1%
CSS 112.0 KiB 1%
Other 32.1 KiB 0%
Other 23.6 KiB 0%
Other 0 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

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
71% third-party, 0 ms blocking
FIX
71% third-party, 0 ms blocking
Warning::
Third-party code accounts for 71% of page weight (12.8 MiB of 18.0 MiB)
Info::
Third-party blocking time is low (0 ms)
29%
71%
First-party Third-party
F
JS Execution Cost
Action
13223ms total JS execution
FIX
13223ms total JS execution
Warning::
https://www.brooklinen.com/cdn/wpm/bcfa8229ew36b60...: 1740ms CPU time
Warning::
Unattributable: 1681ms CPU time
Warning::
https://t.contentsquare.net/uxa/ea6942bbd7cb0.js: 1375ms CPU time
Warning::
https://www.brooklinen.com/cdn/shop/t/4410/assets/...: 1063ms CPU time
Warning::
https://rapid-cdn.yottaa.com/rapid/lib/cTNGTFD40YM...: 1054ms CPU time
Warning::
Third-party scripts: 8131ms (61% of total)

Main Thread Breakdown

Script Evaluation 64% Other 20% Style & Layout 8% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.brooklinen.com/cdn/wpm/bcfa8229ew36b6053dp1e134caame9d83f21m.js1740ms1131ms6ms1st
Unattributable1681ms168ms0ms3rd
https://t.contentsquare.net/uxa/ea6942bbd7cb0.js1375ms1170ms31ms3rd
https://www.brooklinen.com/cdn/shop/t/4410/assets/ProductModal-166a90f8.js1063ms727ms1ms1st
https://rapid-cdn.yottaa.com/rapid/lib/cTNGTFD40YMBwA.js1054ms956ms6ms3rd
https://www.brooklinen.com/903ms143ms111ms1st
https://cdn.dynamicyield.com/api/8768435/api_static.js762ms546ms19ms3rd
https://www.brooklinen.com/cdn/shop/t/4410/assets/brooklinen-theme.js?v=169145595473704288901775232910664ms486ms0ms1st
https://www.brooklinen.com/cdn/shop/t/4410/assets/splide.esm-688b6f4b.js577ms137ms0ms1st
https://cdn.us.heap-api.com/v5/heapjs-static/5.3.10/core/heap.js474ms455ms10ms3rd

Showing top 10 of 29 scripts

F
JS Bundles
Action
235 scripts, 1.5 MB unused
FIX
235 scripts, 1.5 MB unused
Warning::
https://sdk.postscript.io/sdk.bundle.js?shopId=166...: 143 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-973...: 101 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.dynamicyield.com/api/8768435/api_stati...: 91 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://2b36d2a1092a.cdn4.forter.com/sn/2b36d2a109...: 89 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 67 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.5 MB
1526 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://sdk.postscript.io/sdk.bundle.js?shopId=1664202 KB143 KB (71%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-973522331&cx=c&gtm=4e6411136 KB101 KB (74%)✓3rd
https://cdn.dynamicyield.com/api/8768435/api_static.js158 KB91 KB (58%)✓3rd
https://2b36d2a1092a.cdn4.forter.com/sn/2b36d2a1092a/script.js215 KB89 KB (42%)✓3rd
https://accounts.google.com/gsi/client93 KB67 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-80JGCF4NMJ&cx=c&gtm=4e6411172 KB64 KB (37%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202508.1.0/otBannerSdk.js120 KB63 KB (52%)✓3rd
https://t.contentsquare.net/uxa/ea6942bbd7cb0.js132 KB59 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=DC-11096279&cx=c&gtm=4e6411129 KB58 KB (45%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N3WBV32176 KB57 KB (32%)✓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.
Info::
ETag present — enables conditional (304) responses

No Cache-Control header

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

B
Image Optimization
117 images, 0 KB saveable
REVIEW
117 images, 0 KB saveable
Info::
All images are well-optimized
117 images 1.6 MB
0 oversized -0 KB
23 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
9 fonts (329 KB)
PASS
9 fonts (329 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

329 KB total

Render-blocking

0

of 9

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 FCP 1.6 s LCP 5.7 shttps://www.brooklinen.com/cdn/shop/files/f__BrandonTextRegular.woff2?v=2923255800735255676f__BrandonTextRegular.w... https://www.brooklinen.com/cdn/shop/files/f__BrandonTextRegular.woff2?v=2923255800735255676 — 34.8 KiB — 0 ms — font-display: swaphttps://www.brooklinen.com/cdn/shop/files/wf_BrandonTextWeb-Medium--360967_B_0.woff2?v=18048165408412969505wf_BrandonTextWeb-Mediu... https://www.brooklinen.com/cdn/shop/files/wf_BrandonTextWeb-Medium--360967_B_0.woff2?v=18048165408412969505 — 33.5 KiB — 0 ms — font-display: swaphttps://www.brooklinen.com/cdn/shop/files/f__BrandonTextBold.woff2?v=9945025441678652657f__BrandonTextBold.woff2 https://www.brooklinen.com/cdn/shop/files/f__BrandonTextBold.woff2?v=9945025441678652657 — 35.8 KiB — 0 ms — font-display: swaphttps://www.brooklinen.com/cdn/shop/files/f__BrandonTextWeb-Italic--360967_8_0.woff2?v=13318003604299643776f__BrandonTextWeb-Itali... https://www.brooklinen.com/cdn/shop/files/f__BrandonTextWeb-Italic--360967_8_0.woff2?v=13318003604299643776 — 33.3 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/s/files/1/0951/7126/files/ToledoSerial-Bold.otf?v=1751402923ToledoSerial-Bold.otf https://cdn.shopify.com/s/files/1/0951/7126/files/ToledoSerial-Bold.otf?v=1751402923 — 28.9 KiB — 0 ms — font-display: swaphttps://www.brooklinen.com/cdn/shop/files/ToledoSerial-Bold.otf?v=1751402923ToledoSerial-Bold.otf https://www.brooklinen.com/cdn/shop/files/ToledoSerial-Bold.otf?v=1751402923 — 28.8 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/1/0951/7126/files/f__BrandonTextRegular.woff2?v=1713457452f__BrandonTextRegular.w... https://cdn.shopify.com/s/files/1/0951/7126/files/f__BrandonTextRegular.woff2?v=1713457452 — 34.7 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/s/files/1/0951/7126/files/f__BrandonTextBold.woff2?v=1713457452f__BrandonTextBold.woff2 https://cdn.shopify.com/s/files/1/0951/7126/files/f__BrandonTextBold.woff2?v=1713457452 — 35.7 KiB — 0 ms — font-display: swap
f__BrandonTextRegular.w... woff2 swap
Size 35 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
wf_BrandonTextWeb-Mediu... woff2 swap
Size 33 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
f__BrandonTextBold.woff2 woff2 swap
Size 36 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
f__BrandonTextWeb-Itali... woff2 swap
Size 33 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
ToledoSerial-Bold.otf otf swap
Size 29 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
ToledoSerial-Bold.otf otf swap
Size 29 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
GTStandard-MRegular.woff2 woff2 swap
Size 63 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
f__BrandonTextRegular.w... woff2 swap
Size 35 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
f__BrandonTextBold.woff2 woff2 swap
Size 36 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)

Fixing the unchecked items could save ~17 KB and ~34 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
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
727 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
61% of JavaScript execution is third-party
First-party Third-party 8131ms · 1852KB · €43/mo
Unattributable
Other
Costly
Execution 1681ms
Transfer 0 KB
Monthly Cost €9/mo
t.contentsquare.net
Other
Costly
Execution 1375ms
Transfer 132 KB
Unused 45%
Monthly Cost €7/mo
rapid-cdn.yottaa.com
Other
Costly
Execution 1054ms
Transfer 45 KB
Unused 61%
Monthly Cost €6/mo
cdn.dynamicyield.com
Other
Costly
Execution 762ms
Transfer 158 KB
Unused 58%
Monthly Cost €4/mo
cdn.us.heap-api.com
Other
Costly
Execution 474ms
Transfer 81 KB
Unused 41%
Monthly Cost €3/mo
cdn.shopify.com
Other
Costly
Execution 324ms
Transfer 1 KB
Unused 60%
Monthly Cost €2/mo
static-resources.botnot.io
Other
Costly
Execution 320ms
Transfer 46 KB
Monthly Cost €2/mo
st.dynamicyield.com
Other
Costly
Execution 291ms
Transfer 5 KB
Monthly Cost €2/mo
2b36d2a1092a.cdn4.forter.com
Other
Costly
Execution 252ms
Transfer 215 KB
Unused 42%
Monthly Cost €1/mo
sdk-metrics.postscript.io
Other
Costly
Execution 214ms
Transfer 69 KB
Unused 29%
Monthly Cost €1/mo
www.redditstatic.com
Other
Optional
Execution 183ms
Transfer 19 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 182ms
Transfer 142 KB
Unused 40%
Monthly Cost €1/mo
sdk.postscript.io
Other
Optional
Execution 152ms
Transfer 202 KB
Unused 71%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 123ms
Transfer 172 KB
Unused 37%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 116ms
Transfer 129 KB
Unused 45%
Monthly Cost €1/mo
analytics.tiktok.com
Other
Optional
Execution 113ms
Transfer 110 KB
Unused 51%
Monthly Cost €1/mo
d38xvr37kwwhcm.cloudfront.net
Other
Optional
Execution 113ms
Transfer 16 KB
Monthly Cost €1/mo
OneTrust
Consent
Essential
Execution 109ms
Transfer 120 KB
Unused 52%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 88ms
Transfer 136 KB
Unused 40%
Monthly Cost €0/mo
brooklinen2.myshopify.com
Other
Optional
Execution 82ms
Transfer 1 KB
Monthly Cost €0/mo
sc-static.net
Other
Optional
Execution 69ms
Transfer 25 KB
Monthly Cost €0/mo
s.pinimg.com
Other
Optional
Execution 52ms
Transfer 27 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • Unattributable adds 1681ms and costs ~€9/month
  • t.contentsquare.net adds 1375ms and costs ~€7/month
  • rapid-cdn.yottaa.com adds 1054ms and costs ~€6/month
  • cdn.dynamicyield.com adds 762ms and costs ~€4/month
  • cdn.us.heap-api.com adds 474ms and costs ~€3/month
  • cdn.shopify.com adds 324ms and costs ~€2/month
  • static-resources.botnot.io adds 320ms and costs ~€2/month
  • st.dynamicyield.com adds 291ms and costs ~€2/month
  • 2b36d2a1092a.cdn4.forter.com adds 252ms and costs ~€1/month
  • sdk-metrics.postscript.io adds 214ms and costs ~€1/month

61% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 1681ms 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

t.contentsquare.net takes 1375ms 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

rapid-cdn.yottaa.com takes 1054ms 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

61% of rapid-cdn.yottaa.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

cdn.dynamicyield.com takes 762ms 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

58% of cdn.dynamicyield.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

cdn.us.heap-api.com takes 474ms 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.shopify.com takes 324ms 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 cdn.shopify.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

static-resources.botnot.io takes 320ms 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

st.dynamicyield.com takes 291ms 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

2b36d2a1092a.cdn4.forter.com takes 252ms 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

sdk-metrics.postscript.io takes 214ms 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

71% of sdk.postscript.io'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 analytics.tiktok.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

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

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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