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https://lulu.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
57
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

1.65 s

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

3.05 s

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

113 ms

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

0.335

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

1.65 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.

3.07 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
15
6 PASS 3 REVIEW 4 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 63 requests
FIX
2.2 MB transferred, 63 requests
Info::
Page weighs 8.0 MB (2.2 MB transferred)
Info::
CSS is 906 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 906 KB
Warning::
JavaScript is 629 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 629 KB
Info::
63 HTTP requests
Info::
Estimated 0.47 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
63 requests
0.47 g CO2 per page load
CSS 906.1 KiB 39%
JavaScript 629.1 KiB 27%
Images 572.4 KiB 25%
Fonts 110.0 KiB 5%
HTML 57.4 KiB 2%
Other 13.6 KiB 1%
Other 8.6 KiB 0%
Other 156 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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

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 (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
63 resources · 2.2 MB · 188 KB savings available
FIX
63 resources · 2.2 MB · 188 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~188 KB of savings available
Warning::
62 third-party resources (100% of weight)
Info::
2 resources over 200KB
63 resources · 2.2 MiB · 62 third-party 1.2 MiB over 1MB target
CSS 40% · 911.4 KiB
JavaScript 28% · 635.8 KiB
Image 25% · 574.1 KiB
Font 5% · 110.0 KiB
Document 2% · 57.4 KiB
Other 0% · 8.4 KiB

~187.9 KiB of savings available

Remove unused JavaScript: 187.9 KiB
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
36 images, 0 KB saveable
REVIEW
36 images, 0 KB saveable
Warning::
https://img.youtube.com/vi/3LYsn03uyL8/maxresdefau... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
36 images 572 KB
0 oversized -0 KB
21 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

B
JS Execution Cost
937ms total JS execution
REVIEW
937ms total JS execution
Warning::
Unattributable: 268ms CPU time
Info::
https://www.lulu.com/: 201ms CPU time
Info::
https://www.lulu.com/_next/static/chunks/pages/_ap...: 197ms CPU time
Info::
https://www.lulu.com/_next/static/chunks/framework...: 188ms CPU time
Info::
https://www.lulu.com/_next/static/css/8891f4173d42...: 82ms CPU time
Warning::
Third-party scripts: 937ms (100% of total)

Main Thread Breakdown

Script Evaluation 38% Other 30% Style & Layout 14% Script Parsing & Compilation 8% Parse HTML & CSS 7%
ScriptTotalScriptingParse/CompileParty
Unattributable268ms9ms0ms3rd
https://www.lulu.com/201ms6ms0ms3rd
https://www.lulu.com/_next/static/chunks/pages/_app-0a96cd61aa379a7b.js197ms129ms62ms3rd
https://www.lulu.com/_next/static/chunks/framework-9c77ee99132d6bfd.js188ms178ms8ms3rd
https://www.lulu.com/_next/static/css/8891f4173d423714.css82ms0ms0ms3rd
C
JS Bundles
Action
11 scripts, 188 KB unused
REVIEW
11 scripts, 188 KB unused
Warning::
https://www.lulu.com/_next/static/chunks/pages/_ap...: 188 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 188 KB
188 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.lulu.com/_next/static/chunks/pages/_app-0a96cd61aa379a7b.js525 KB188 KB (36%)✓3rd
https://www.lulu.com/_next/static/chunks/webpack-553394d1d865875a.js3 KB—✓3rd
https://www.lulu.com/_next/static/chunks/framework-9c77ee99132d6bfd.js44 KB—✓3rd
https://www.lulu.com/_next/static/chunks/main-af44a5115117342d.js38 KB—✓3rd
https://www.lulu.com/_next/static/chunks/pages/index-cde1be032b462290.js1 KB—✓3rd
https://www.lulu.com/_next/static/V_wfhljALG5zHy2dBCBU8/_buildManifest.js1 KB—✓3rd
https://www.lulu.com/_next/static/V_wfhljALG5zHy2dBCBU8/_ssgManifest.js0 KB—✓3rd
https://www.lulu.com/_next/static/chunks/514.fddcc21ef935af8d.js14 KB—✓3rd
https://www.lulu.com/_next/static/chunks/pages/cart-ae8f3150c4cedb98.js7 KB—✓3rd
https://www.lulu.com/_next/static/chunks/1086.930ec4404370f1f4.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

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
5 fonts (110 KB)
PASS
5 fonts (110 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

110 KB total

Render-blocking

0

of 5

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 1.6 s LCP 3.0 shttps://fonts.gstatic.com/s/calistoga/v18/6NUU8F2OJg6MeR7l4e0fs8wB49dJfg.woff26NUU8F2OJg6MeR7l4e0fs8w... https://fonts.gstatic.com/s/calistoga/v18/6NUU8F2OJg6MeR7l4e0fs8wB49dJfg.woff2 — 31.5 KiB — 95 ms — font-display: swaphttps://assets.lulu.com/media/fonts/MuseoSans/woff2/MuseoSans_700.woff2MuseoSans_700.woff2 https://assets.lulu.com/media/fonts/MuseoSans/woff2/MuseoSans_700.woff2 — 19.3 KiB — 60 ms — font-display: swaphttps://assets.lulu.com/media/fonts/MuseoSans/woff2/MuseoSans_300.woff2MuseoSans_300.woff2 https://assets.lulu.com/media/fonts/MuseoSans/woff2/MuseoSans_300.woff2 — 19.8 KiB — 51 ms — font-display: swaphttps://assets.lulu.com/media/fonts/MuseoSans/woff2/MuseoSans_500.woff2MuseoSans_500.woff2 https://assets.lulu.com/media/fonts/MuseoSans/woff2/MuseoSans_500.woff2 — 19.7 KiB — 63 ms — font-display: swaphttps://www.lulu.com/_next/static/media/icons.8cb6f880.woff2icons.8cb6f880.woff2 https://www.lulu.com/_next/static/media/icons.8cb6f880.woff2 — 19.6 KiB — 68 ms — font-display: swap
6NUU8F2OJg6MeR7l4e0fs8w... woff2 swap
Size 31 KB
Load time 95 ms
Start 115 ms
Risk FOUT — text flashes from fallback to web font
MuseoSans_700.woff2 woff2 swap
Size 19 KB
Load time 60 ms
Start 582 ms
Risk FOUT — text flashes from fallback to web font
MuseoSans_300.woff2 woff2 swap
Size 20 KB
Load time 51 ms
Start 582 ms
Risk FOUT — text flashes from fallback to web font
MuseoSans_500.woff2 woff2 swap
Size 20 KB
Load time 63 ms
Start 583 ms
Risk FOUT — text flashes from fallback to web font
icons.8cb6f880.woff2 woff2 swap
Size 20 KB
Load time 68 ms
Start 583 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
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
63 requests over 1135ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.6 s LCP 3.0 shttps://lulu.com// https://lulu.com/ — 301 — 93 B — 33 ms — h2https://www.lulu.com/www.lulu.com/ https://www.lulu.com/ — 200 — 57.4 KiB — 76 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/2PtX9tp1DcPx4452zfwonm/f1ef9d0677c02bf423ca00cd2b8f262a/lulu-home-hero-2026-desktop-short.jpg?w=2880&h=960&fm=webpimages.ctfassets.net/9htf9uzhsn4z/2... https://images.ctfassets.net/9htf9uzhsn4z/2PtX9tp1DcPx4452zfwonm/f1ef9d0677c02bf423ca00cd2b8f262a/lulu-home-hero-2026-desktop-short.jpg?w=2880&h=960&fm=webp — 200 — 56.0 KiB — 49 ms — h2https://fonts.gstatic.com/s/calistoga/v18/6NUU8F2OJg6MeR7l4e0fs8wB49dJfg.woff2fonts.gstatic.com/s/calistoga/v18/6... https://fonts.gstatic.com/s/calistoga/v18/6NUU8F2OJg6MeR7l4e0fs8wB49dJfg.woff2 — 200 — 31.5 KiB — 95 ms — h3https://www.lulu.com/_next/static/css/8891f4173d423714.csswww.lulu.com/_next/static/css/8891f... https://www.lulu.com/_next/static/css/8891f4173d423714.css — 200 — 906.1 KiB — 263 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/3tSSOSmHDmAKXuhUbZD27g/9f3a594a7c169dec01aea36d42179366/lulu-logo-slate.svgimages.ctfassets.net/9htf9uzhsn4z/3... https://images.ctfassets.net/9htf9uzhsn4z/3tSSOSmHDmAKXuhUbZD27g/9f3a594a7c169dec01aea36d42179366/lulu-logo-slate.svg — 200 — 1.6 KiB — 29 ms — h2https://www.lulu.com/_next/static/chunks/webpack-553394d1d865875a.jswww.lulu.com/_next/static/chunks/we... https://www.lulu.com/_next/static/chunks/webpack-553394d1d865875a.js — 200 — 3.1 KiB — 54 ms — h2https://www.lulu.com/_next/static/chunks/framework-9c77ee99132d6bfd.jswww.lulu.com/_next/static/chunks/fr... https://www.lulu.com/_next/static/chunks/framework-9c77ee99132d6bfd.js — 200 — 44.2 KiB — 92 ms — h2https://www.lulu.com/_next/static/chunks/main-af44a5115117342d.jswww.lulu.com/_next/static/chunks/ma... https://www.lulu.com/_next/static/chunks/main-af44a5115117342d.js — 200 — 38.0 KiB — 116 ms — h2https://www.lulu.com/_next/static/chunks/pages/_app-0a96cd61aa379a7b.jswww.lulu.com/_next/static/chunks/pa... https://www.lulu.com/_next/static/chunks/pages/_app-0a96cd61aa379a7b.js — 200 — 525.1 KiB — 223 ms — h2https://www.lulu.com/_next/static/chunks/pages/index-cde1be032b462290.jswww.lulu.com/_next/static/chunks/pa... https://www.lulu.com/_next/static/chunks/pages/index-cde1be032b462290.js — 200 — 870 B — 76 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/YNB18TdbBgoSk3WX7AxE9/369d6200700c142a20b46f41cdf34205/lulu-video-life-of-a-book-card.jpg?w=512&h=300&fm=webpimages.ctfassets.net/9htf9uzhsn4z/Y... https://images.ctfassets.net/9htf9uzhsn4z/YNB18TdbBgoSk3WX7AxE9/369d6200700c142a20b46f41cdf34205/lulu-video-life-of-a-book-card.jpg?w=512&h=300&fm=webp — 200 — 22.0 KiB — 76 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/1hPLKdZIbL6hf3TC0WDlnI/7e0ea7c1fee6cb4b60bae085869fc147/lulu-blog-how-to-self-publish-card.png?w=512&h=300&fm=webpimages.ctfassets.net/9htf9uzhsn4z/1... https://images.ctfassets.net/9htf9uzhsn4z/1hPLKdZIbL6hf3TC0WDlnI/7e0ea7c1fee6cb4b60bae085869fc147/lulu-blog-how-to-self-publish-card.png?w=512&h=300&fm=webp — 200 — 27.8 KiB — 78 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/25K870TmxHQmBgyO5gLRps/ecae2f5d5fa9cb6c919d4091ee5eb95c/lulu-video-monetize-content-card.jpg?w=512&h=300&fm=webpimages.ctfassets.net/9htf9uzhsn4z/2... https://images.ctfassets.net/9htf9uzhsn4z/25K870TmxHQmBgyO5gLRps/ecae2f5d5fa9cb6c919d4091ee5eb95c/lulu-video-monetize-content-card.jpg?w=512&h=300&fm=webp — 200 — 33.0 KiB — 71 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/2vab6dFGeXbwBGHLAKeLjv/b4811ef9824e0560763206b44da5707d/lulu-blog-pod-books-for-kickstarter-card.jpg?w=512&h=300&fm=webpimages.ctfassets.net/9htf9uzhsn4z/2... https://images.ctfassets.net/9htf9uzhsn4z/2vab6dFGeXbwBGHLAKeLjv/b4811ef9824e0560763206b44da5707d/lulu-blog-pod-books-for-kickstarter-card.jpg?w=512&h=300&fm=webp — 200 — 13.7 KiB — 69 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/6KHvO632JMdn3L3pps1LGA/a53b9c8e9c5dcf4e54f2249494b88af2/lulu-video-publishing-steps-card.jpg?w=512&h=300&fm=webpimages.ctfassets.net/9htf9uzhsn4z/6... https://images.ctfassets.net/9htf9uzhsn4z/6KHvO632JMdn3L3pps1LGA/a53b9c8e9c5dcf4e54f2249494b88af2/lulu-video-publishing-steps-card.jpg?w=512&h=300&fm=webp — 200 — 9.3 KiB — 55 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/3K06eM8WTamRixRztvrRqR/933e6b7bf1a6330fef6a003ac05f8c5f/lulu-print-book-beginner-card-2x.png?w=512&h=300&fm=webpimages.ctfassets.net/9htf9uzhsn4z/3... https://images.ctfassets.net/9htf9uzhsn4z/3K06eM8WTamRixRztvrRqR/933e6b7bf1a6330fef6a003ac05f8c5f/lulu-print-book-beginner-card-2x.png?w=512&h=300&fm=webp — 200 — 34.8 KiB — 66 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/1cnaUlra2d6lNp0hecAksg/fb702f7d83dbf7972292e75d220f019a/authors-creators.svgimages.ctfassets.net/9htf9uzhsn4z/1... 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https://images.ctfassets.net/9htf9uzhsn4z/2JKzcBsyqVQXpLGTQ84mJz/09946246c8bc01ec135c91dabb40dacb/enterprise-publishers.svg — 200 — 41.4 KiB — 118 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/H81ZNoFG9ZapNe8YpdJiK/9b3bdba6bf35c794186221165c06d419/kilo-health.svgimages.ctfassets.net/9htf9uzhsn4z/H... https://images.ctfassets.net/9htf9uzhsn4z/H81ZNoFG9ZapNe8YpdJiK/9b3bdba6bf35c794186221165c06d419/kilo-health.svg — 200 — 3.6 KiB — 78 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/3XPDTb5MrkNgAuE1LvyuqO/9160276f7a344aa17df00775c1536638/IAEI.png?w=2880&h=960&fm=webpimages.ctfassets.net/9htf9uzhsn4z/3... https://images.ctfassets.net/9htf9uzhsn4z/3XPDTb5MrkNgAuE1LvyuqO/9160276f7a344aa17df00775c1536638/IAEI.png?w=2880&h=960&fm=webp — 200 — 10.9 KiB — 93 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/4RdvBCic7cBrJVkvxrdYYc/576f1400a8ea34f38c03d4775a31ac2d/fiverr.svgimages.ctfassets.net/9htf9uzhsn4z/4... https://images.ctfassets.net/9htf9uzhsn4z/4RdvBCic7cBrJVkvxrdYYc/576f1400a8ea34f38c03d4775a31ac2d/fiverr.svg — 200 — 1.2 KiB — 84 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/3WOv7TczaVOmJGV03d6JnX/a323830d57f7216e35f588a20c2990d5/mens-fitness.svgimages.ctfassets.net/9htf9uzhsn4z/3... https://images.ctfassets.net/9htf9uzhsn4z/3WOv7TczaVOmJGV03d6JnX/a323830d57f7216e35f588a20c2990d5/mens-fitness.svg — 200 — 3.4 KiB — 73 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/2n1ac2ZSd3mECIHKcgeAhK/9c4b9cb887aaa0b99db6d1823edab85e/honeywell.svgimages.ctfassets.net/9htf9uzhsn4z/2... https://images.ctfassets.net/9htf9uzhsn4z/2n1ac2ZSd3mECIHKcgeAhK/9c4b9cb887aaa0b99db6d1823edab85e/honeywell.svg — 200 — 1.8 KiB — 79 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/5PFKvGDOHxq9miWBJ3rHl9/75719f8114da8127302713188f9728e1/adventure-sports-network.svgimages.ctfassets.net/9htf9uzhsn4z/5... 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https://www.lulu.com/_next/static/media/icons.8cb6f880.woff2 — 200 — 19.6 KiB — 68 ms — h2https://o4504922469761024.ingest.sentry.io/api/4505352956084224/envelope/?sentry_version=7&sentry_key=2ac07514194a41ba9efcb965e1f8a890&sentry_client=sentry.javascript.browser%2F10.44.0o4504922469761024.ingest.sentry.io/... https://o4504922469761024.ingest.sentry.io/api/4505352956084224/envelope/?sentry_version=7&sentry_key=2ac07514194a41ba9efcb965e1f8a890&sentry_client=sentry.javascript.browser%2F10.44.0 — 200 — 300 B — 109 ms — h2https://o4504922469761024.ingest.sentry.io/api/4505352956084224/envelope/?sentry_version=7&sentry_key=2ac07514194a41ba9efcb965e1f8a890&sentry_client=sentry.javascript.browser%2F10.44.0o4504922469761024.ingest.sentry.io/... https://o4504922469761024.ingest.sentry.io/api/4505352956084224/envelope/?sentry_version=7&sentry_key=2ac07514194a41ba9efcb965e1f8a890&sentry_client=sentry.javascript.browser%2F10.44.0 — 200 — 56 B — 42 ms — h2https://o4504922469761024.ingest.sentry.io/api/4505352956084224/envelope/?sentry_version=7&sentry_key=2ac07514194a41ba9efcb965e1f8a890&sentry_client=sentry.javascript.browser%2F10.44.0o4504922469761024.ingest.sentry.io/... https://o4504922469761024.ingest.sentry.io/api/4505352956084224/envelope/?sentry_version=7&sentry_key=2ac07514194a41ba9efcb965e1f8a890&sentry_client=sentry.javascript.browser%2F10.44.0 — 200 — 56 B — 41 ms — h2https://growthbook-proxy.lulu.com/sub/sdk-g5pnEMgQb9L3x0Ffgrowthbook-proxy.lulu.com/sub/sdk-g... https://growthbook-proxy.lulu.com/sub/sdk-g5pnEMgQb9L3x0Ff — 200 — 156 B — 112 ms — h2https://www.lulu.com/api/auth/sessionwww.lulu.com/api/auth/session https://www.lulu.com/api/auth/session — 200 — 501 B — 126 ms — h2https://www.lulu.com/_next/static/chunks/514.fddcc21ef935af8d.jswww.lulu.com/_next/static/chunks/51... https://www.lulu.com/_next/static/chunks/514.fddcc21ef935af8d.js — 200 — 14.2 KiB — 56 ms — h2https://growthbook-proxy.lulu.com/api/features/sdk-g5pnEMgQb9L3x0Ffgrowthbook-proxy.lulu.com/api/featu... https://growthbook-proxy.lulu.com/api/features/sdk-g5pnEMgQb9L3x0Ff — 200 — 7.3 KiB — 96 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/65ChJFhXVVsK43no2cEmRP/74d6a362f3398813b91a4c682cdd7c0e/lulu-account-main-banner-desktop-short.jpg?w=2880&h=960&fm=webpimages.ctfassets.net/9htf9uzhsn4z/6... https://images.ctfassets.net/9htf9uzhsn4z/65ChJFhXVVsK43no2cEmRP/74d6a362f3398813b91a4c682cdd7c0e/lulu-account-main-banner-desktop-short.jpg?w=2880&h=960&fm=webp — 200 — 20.9 KiB — 9 ms — h2https://www.lulu.com/favicon.icowww.lulu.com/favicon.ico https://www.lulu.com/favicon.ico — 200 — 1.8 KiB — 123 ms — h2https://www.lulu.com/_next/static/chunks/pages/cart-ae8f3150c4cedb98.jswww.lulu.com/_next/static/chunks/pa... https://www.lulu.com/_next/static/chunks/pages/cart-ae8f3150c4cedb98.js — 200 — 6.7 KiB — 44 ms — h2https://www.lulu.com/_next/static/chunks/1086.930ec4404370f1f4.jswww.lulu.com/_next/static/chunks/10... https://www.lulu.com/_next/static/chunks/1086.930ec4404370f1f4.js — 200 — 2.7 KiB — 49 ms — h2https://www.lulu.com/_next/static/chunks/pages/cart-ae8f3150c4cedb98.jswww.lulu.com/_next/static/chunks/pa... https://www.lulu.com/_next/static/chunks/pages/cart-ae8f3150c4cedb98.js — 200 — 0 B — 4 ms — h2https://www.lulu.com/_next/static/css/867d9720f2c7b4e5.csswww.lulu.com/_next/static/css/867d9... https://www.lulu.com/_next/static/css/867d9720f2c7b4e5.css — 200 — 5.4 KiB — 52 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 937ms · 1533KB · €5/mo
Unattributable
Other
Costly
Execution 268ms
Transfer 0 KB
Monthly Cost €1/mo
www.lulu.com
Other
Costly
Execution 201ms
Transfer 57 KB
Monthly Cost €1/mo
www.lulu.com
Other
Optional
Execution 197ms
Transfer 525 KB
Unused 36%
Monthly Cost €1/mo
www.lulu.com
Other
Optional
Execution 188ms
Transfer 44 KB
Monthly Cost €1/mo
www.lulu.com
Other
Optional
Execution 82ms
Transfer 906 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • Unattributable adds 268ms and costs ~€1/month
  • www.lulu.com adds 201ms 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 268ms 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.lulu.com takes 201ms 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

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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