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https://lulu.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
39
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
98
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.

7.62 s

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

15.11 s

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

718 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.

8.92 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.

15.23 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
17
8 PASS 2 REVIEW 5 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 64 requests
FIX
2.3 MB transferred, 64 requests
Info::
Page weighs 8.1 MB (2.3 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::
64 HTTP requests
Info::
Estimated 0.48 g CO2 per page load
2.3 MB / 2.4 MB budget
2.3 MB transferred
64 requests
0.48 g CO2 per page load
CSS 906.0 KiB 39%
JavaScript 629.1 KiB 27%
Images 599.3 KiB 26%
Fonts 109.9 KiB 5%
HTML 57.2 KiB 2%
Other 13.6 KiB 1%
Other 8.7 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 (2.3 MiB of 2.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3121ms total JS execution
FIX
3121ms total JS execution
Warning::
Unattributable: 861ms CPU time
Warning::
https://www.lulu.com/_next/static/chunks/framework...: 717ms CPU time
Warning::
https://www.lulu.com/_next/static/chunks/pages/_ap...: 611ms CPU time
Warning::
https://www.lulu.com/: 551ms CPU time
Warning::
https://www.lulu.com/_next/static/css/8891f4173d42...: 282ms CPU time
Warning::
Third-party scripts: 3121ms (100% of total)

Main Thread Breakdown

Script Evaluation 38% Other 28% Style & Layout 16% Parse HTML & CSS 9% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
Unattributable861ms33ms0ms3rd
https://www.lulu.com/_next/static/chunks/framework-9c77ee99132d6bfd.js717ms647ms14ms3rd
https://www.lulu.com/_next/static/chunks/pages/_app-0a96cd61aa379a7b.js611ms387ms207ms3rd
https://www.lulu.com/551ms8ms2ms3rd
https://www.lulu.com/_next/static/css/8891f4173d423714.css282ms0ms0ms3rd
https://www.lulu.com/_next/static/chunks/main-af44a5115117342d.js99ms78ms17ms3rd
D
Page Weight Inventory
Action
64 resources · 2.3 MB · 188 KB savings available
FIX
64 resources · 2.3 MB · 188 KB savings available
Warning::
Page weight 1.3 MB over 1MB target
Got: 2.3 MB Expected: ≤ 1 MB
Info::
~188 KB of savings available
Warning::
63 third-party resources (100% of weight)
Info::
2 resources over 200KB
64 resources · 2.3 MiB · 63 third-party 1.3 MiB over 1MB target
CSS 39% · 911.4 KiB
JavaScript 27% · 635.9 KiB
Image 26% · 601.1 KiB
Font 5% · 109.9 KiB
Document 2% · 57.2 KiB
Other 0% · 8.5 KiB

~187.7 KiB of savings available

Remove unused JavaScript: 187.7 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.

C
Image Optimization
Action
37 images, 0 KB saveable
REVIEW
37 images, 0 KB saveable
Warning::
https://images.ctfassets.net/9htf9uzhsn4z/3tSSOSmH... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/9htf9uzhsn4z/6eIZHqMZ... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/9htf9uzhsn4z/1cnaUlra... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/9htf9uzhsn4z/5nKtFXNc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img.youtube.com/vi/3LYsn03uyL8/maxresdefau... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/9htf9uzhsn4z/4PJUjNW2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/9htf9uzhsn4z/2p6aLt7P... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/9htf9uzhsn4z/2JKzcBsy... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
37 images 599 KB
0 oversized -0 KB
21 legacy format
8 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

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

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

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

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

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

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

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

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/1086.930ec4404370f1f4.js3 KB—✓3rd
https://www.lulu.com/_next/static/chunks/pages/cart-ae8f3150c4cedb98.js7 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 7.6 s LCP 15.1 shttps://fonts.gstatic.com/s/calistoga/v18/6NUU8F2OJg6MeR7l4e0fs8wB49dJfg.woff26NUU8F2OJg6MeR7l4e0fs8w... https://fonts.gstatic.com/s/calistoga/v18/6NUU8F2OJg6MeR7l4e0fs8wB49dJfg.woff2 — 31.5 KiB — 61 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 — 58 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 — 44 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 — 60 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 — 19.5 KiB — 53 ms — font-display: swap
6NUU8F2OJg6MeR7l4e0fs8w... woff2 swap
Size 31 KB
Load time 61 ms
Start 92 ms
Risk FOUT — text flashes from fallback to web font
MuseoSans_700.woff2 woff2 swap
Size 19 KB
Load time 58 ms
Start 642 ms
Risk FOUT — text flashes from fallback to web font
MuseoSans_300.woff2 woff2 swap
Size 20 KB
Load time 44 ms
Start 642 ms
Risk FOUT — text flashes from fallback to web font
MuseoSans_500.woff2 woff2 swap
Size 20 KB
Load time 60 ms
Start 642 ms
Risk FOUT — text flashes from fallback to web font
icons.8cb6f880.woff2 woff2 swap
Size 20 KB
Load time 53 ms
Start 643 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
1
preload
4
dns-prefetch
—
prefetch
1

6 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
64 requests over 2341ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 7.6 s LCP 15.1 shttps://lulu.com// https://lulu.com/ — 301 — 93 B — 26 ms — h2https://www.lulu.com/www.lulu.com/ https://www.lulu.com/ — 200 — 57.2 KiB — 51 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/5BznDPBoNfwTNzGOGNwH65/2afa6cb0ada5b1d1fad108ac4b6fa2b3/lulu-home-hero-2026-mobile.jpg?w=600&h=720&fm=webpimages.ctfassets.net/9htf9uzhsn4z/5... https://images.ctfassets.net/9htf9uzhsn4z/5BznDPBoNfwTNzGOGNwH65/2afa6cb0ada5b1d1fad108ac4b6fa2b3/lulu-home-hero-2026-mobile.jpg?w=600&h=720&fm=webp — 200 — 17.2 KiB — 42 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 — 61 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 — 906.0 KiB — 208 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 — 48 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 — 54 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 — 48 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 — 47 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 — 43 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 — 94 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 — 124 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 — 38.1 KiB — 119 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 — 188 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 — 820 B — 113 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 — 25 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 — 88 ms — 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https://images.ctfassets.net/9htf9uzhsn4z/Rt46pzcm5g5ceqgSpg3Pr/f30f9cbcf7280ffda10c0ff5a68ece6e/alliance.png?w=4000&h=1920&fm=webp — 200 — 11.5 KiB — 65 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/4M5pIfH6CoBXBJTMpP2Xjk/6101270a29a345fe301240bf2eddaa6c/clmp.svgimages.ctfassets.net/9htf9uzhsn4z/4... https://images.ctfassets.net/9htf9uzhsn4z/4M5pIfH6CoBXBJTMpP2Xjk/6101270a29a345fe301240bf2eddaa6c/clmp.svg — 200 — 3.1 KiB — 90 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/6eIZHqMZrwqjNVTzleiqSV/ed97b73a6b6b08a195028acaa0558834/lulu-testimonial-kcross-mobile.png?w=1200&h=1440&fm=webpimages.ctfassets.net/9htf9uzhsn4z/6... https://images.ctfassets.net/9htf9uzhsn4z/6eIZHqMZrwqjNVTzleiqSV/ed97b73a6b6b08a195028acaa0558834/lulu-testimonial-kcross-mobile.png?w=1200&h=1440&fm=webp — 200 — 40.0 KiB — 72 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/2p6aLt7PLeGFtMfp8eiYrt/5b0f7c18c8356c372a00b1360e4574b7/lulu-testimonial-mpittett-mobile.png?w=1200&h=1440&fm=webpimages.ctfassets.net/9htf9uzhsn4z/2... https://images.ctfassets.net/9htf9uzhsn4z/2p6aLt7PLeGFtMfp8eiYrt/5b0f7c18c8356c372a00b1360e4574b7/lulu-testimonial-mpittett-mobile.png?w=1200&h=1440&fm=webp — 200 — 32.5 KiB — 76 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/6tRxWXzRdXYXDq87tG622s/f8b3fb1f8bd278b109b92074e47af934/aicpa-soc-logo-black.svgimages.ctfassets.net/9htf9uzhsn4z/6... https://images.ctfassets.net/9htf9uzhsn4z/6tRxWXzRdXYXDq87tG622s/f8b3fb1f8bd278b109b92074e47af934/aicpa-soc-logo-black.svg — 200 — 7.9 KiB — 91 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/5h6qZ4hA458RAEu2ma4mOx/49401f89b5e6b20c01dbe427c832ceda/b-corp-logo-black.svgimages.ctfassets.net/9htf9uzhsn4z/5... https://images.ctfassets.net/9htf9uzhsn4z/5h6qZ4hA458RAEu2ma4mOx/49401f89b5e6b20c01dbe427c832ceda/b-corp-logo-black.svg — 200 — 3.5 KiB — 93 ms — h2https://www.lulu.com/_next/static/V_wfhljALG5zHy2dBCBU8/_buildManifest.jswww.lulu.com/_next/static/V_wfhljAL... https://www.lulu.com/_next/static/V_wfhljALG5zHy2dBCBU8/_buildManifest.js — 200 — 702 B — 75 ms — h2https://www.lulu.com/_next/static/V_wfhljALG5zHy2dBCBU8/_ssgManifest.jswww.lulu.com/_next/static/V_wfhljAL... https://www.lulu.com/_next/static/V_wfhljALG5zHy2dBCBU8/_ssgManifest.js — 200 — 179 B — 65 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 — 86 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 — 43 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://assets.lulu.com/media/fonts/MuseoSans/woff2/MuseoSans_700.woff2assets.lulu.com/media/fonts/MuseoSa... https://assets.lulu.com/media/fonts/MuseoSans/woff2/MuseoSans_700.woff2 — 200 — 19.3 KiB — 58 ms — h2https://assets.lulu.com/media/fonts/MuseoSans/woff2/MuseoSans_300.woff2assets.lulu.com/media/fonts/MuseoSa... https://assets.lulu.com/media/fonts/MuseoSans/woff2/MuseoSans_300.woff2 — 200 — 19.8 KiB — 44 ms — h2https://assets.lulu.com/media/fonts/MuseoSans/woff2/MuseoSans_500.woff2assets.lulu.com/media/fonts/MuseoSa... https://assets.lulu.com/media/fonts/MuseoSans/woff2/MuseoSans_500.woff2 — 200 — 19.7 KiB — 60 ms — h2https://www.lulu.com/_next/static/media/icons.8cb6f880.woff2www.lulu.com/_next/static/media/ico... https://www.lulu.com/_next/static/media/icons.8cb6f880.woff2 — 200 — 19.5 KiB — 53 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 — 113 ms — h2https://www.lulu.com/api/auth/sessionwww.lulu.com/api/auth/session https://www.lulu.com/api/auth/session — 200 — 517 B — 122 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 — 14.3 KiB — 62 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 — 97 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/5BznDPBoNfwTNzGOGNwH65/2afa6cb0ada5b1d1fad108ac4b6fa2b3/lulu-home-hero-2026-mobile.jpg?w=1200&h=1440&fm=webpimages.ctfassets.net/9htf9uzhsn4z/5... https://images.ctfassets.net/9htf9uzhsn4z/5BznDPBoNfwTNzGOGNwH65/2afa6cb0ada5b1d1fad108ac4b6fa2b3/lulu-home-hero-2026-mobile.jpg?w=1200&h=1440&fm=webp — 200 — 71.6 KiB — 16 ms — h2https://images.ctfassets.net/9htf9uzhsn4z/4ucmg57F1semDd5CooeunS/e9fd17209aa0ead474ccec86b439614b/lulu-account-main-banner-mobile-medium.jpg?w=1200&h=1440&fm=webpimages.ctfassets.net/9htf9uzhsn4z/4... https://images.ctfassets.net/9htf9uzhsn4z/4ucmg57F1semDd5CooeunS/e9fd17209aa0ead474ccec86b439614b/lulu-account-main-banner-mobile-medium.jpg?w=1200&h=1440&fm=webp — 200 — 16.6 KiB — 14 ms — h2https://www.lulu.com/favicon.icowww.lulu.com/favicon.ico https://www.lulu.com/favicon.ico — 200 — 1.8 KiB — 115 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 — 2.6 KiB — 40 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 — 6.8 KiB — 41 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 — 5 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 — 44 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 3121ms · 1571KB · €17/mo
Unattributable
Other
Costly
Execution 861ms
Transfer 0 KB
Monthly Cost €5/mo
www.lulu.com
Other
Costly
Execution 717ms
Transfer 44 KB
Monthly Cost €4/mo
www.lulu.com
Other
Costly
Execution 611ms
Transfer 525 KB
Unused 36%
Monthly Cost €3/mo
www.lulu.com
Other
Costly
Execution 551ms
Transfer 57 KB
Monthly Cost €3/mo
www.lulu.com
Other
Costly
Execution 282ms
Transfer 906 KB
Monthly Cost €1/mo
www.lulu.com
Other
Optional
Execution 99ms
Transfer 38 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 861ms and costs ~€5/month
  • www.lulu.com adds 717ms and costs ~€4/month
  • www.lulu.com adds 611ms and costs ~€3/month
  • www.lulu.com adds 551ms and costs ~€3/month
  • www.lulu.com adds 282ms 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 861ms 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 717ms 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 611ms 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 551ms 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 282ms 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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