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https://lush.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
4
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
62
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
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.
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.

865 ms

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

1.53 s

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

668 ms

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

0.073

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

2.39 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.

2.94 s

Page Load Progression

396 ms
792 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.8 s
3.2 s
Checks
15
7 PASS 2 REVIEW 4 FIX
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 (1.9 MiB of 1.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2317ms total JS execution
FIX
2317ms total JS execution
Warning::
https://www.lush.com/_next/static/chunks/framework...: 1046ms CPU time
Warning::
https://www.lush.com/_next/static/chunks/pages/_ap...: 647ms CPU time
Info::
https://www.lush.com/uk/en: 182ms CPU time
Info::
Unattributable: 167ms CPU time
Info::
https://www.lush.com/cdn-cgi/challenge-platform/sc...: 99ms CPU time
Warning::
Third-party scripts: 2317ms (100% of total)

Main Thread Breakdown

Script Evaluation 72% Other 10% Style & Layout 7% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.lush.com/_next/static/chunks/framework-945b357d4a851f4b.js1046ms938ms6ms3rd
https://www.lush.com/_next/static/chunks/pages/_app-bb25c12dfb2b26cc.js647ms477ms109ms3rd
https://www.lush.com/uk/en182ms16ms1ms3rd
Unattributable167ms5ms0ms3rd
https://www.lush.com/cdn-cgi/challenge-platform/scripts/jsd/main.js99ms94ms1ms3rd
https://www.lush.com/_next/static/chunks/5357-f2def74049049301.js63ms59ms3ms3rd
https://www.lush.com/_next/static/chunks/main-b7c9299ea2a9300d.js58ms50ms5ms3rd
https://www.lush.com/_next/static/chunks/9997.cc7fe8894e34baec.js55ms36ms0ms3rd
D
Page Weight Inventory
Action
72 resources · 1.9 MB · 154 KB savings available
FIX
72 resources · 1.9 MB · 154 KB savings available
Warning::
Page weight 943 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~154 KB of savings available
Warning::
71 third-party resources (100% of weight)
Info::
2 resources over 200KB
72 resources · 1.9 MiB · 71 third-party 943.1 KiB over 1MB target
JavaScript 42% · 827.9 KiB
Image 32% · 624.8 KiB
Font 19% · 368.6 KiB
Document 5% · 93.3 KiB
Other 1% · 26.3 KiB
CSS 1% · 26.3 KiB

~153.9 KiB of savings available

Remove unused JavaScript: 153.9 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.

C
Page Weight Budget
Action
1.9 MB transferred, 72 requests
REVIEW
1.9 MB transferred, 72 requests
Info::
Page weighs 5.1 MB (1.9 MB transferred)
Warning::
JavaScript is 809 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 809 KB
Info::
Fonts are 369 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 369 KB
Info::
72 HTTP requests
Info::
Estimated 0.40 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
72 requests
0.40 g CO2 per page load
JavaScript 809.4 KiB 41%
Images 622.1 KiB 32%
Fonts 368.6 KiB 19%
HTML 93.3 KiB 5%
CSS 26.3 KiB 1%
Other 23.8 KiB 1%
Other 22.8 KiB 1%
Other 1.0 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

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

C
JS Bundles
Action
30 scripts, 154 KB unused
REVIEW
30 scripts, 154 KB unused
Warning::
https://www.lush.com/_next/static/chunks/pages/_ap...: 154 KB unused (27%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 154 KB
154 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.lush.com/_next/static/chunks/pages/_app-bb25c12dfb2b26cc.js567 KB154 KB (27%)✓3rd
https://apps.bazaarvoice.com/deployments/lush/main_site/production/en_GB/bv.js28 KB—✓3rd
https://www.lush.com/_next/static/chunks/8366-40fe9c88ab950093.js4 KB—✓3rd
https://www.lush.com/_next/static/chunks/framework-945b357d4a851f4b.js45 KB—✓3rd
https://www.lush.com/_next/static/chunks/pages/%5Bchannel%5D/%5Blanguage%5D-b0eb36bf1c9d8b5b.js5 KB—✓3rd
https://www.lush.com/_next/static/production-c4574453/_buildManifest.js3 KB—✓3rd
https://www.lush.com/_next/static/production-c4574453/_ssgManifest.js1 KB—✓3rd
https://www.lush.com/_next/static/chunks/7938.163588eab48a5777.js2 KB—✓3rd
https://www.lush.com/_next/static/chunks/9997.cc7fe8894e34baec.js3 KB—✓3rd
https://www.lush.com/_next/static/chunks/2030.05244573a17a67ed.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
Image Optimization
10 images, 0 KB saveable
PASS
10 images, 0 KB saveable
Info::
All images are well-optimized
10 images 622 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
3 fonts (369 KB)
PASS
3 fonts (369 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

369 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s FCP 865 ms LCP 1.5 shttps://www.lush.com/assets/fonts/inter/Inter-Regular.ttfInter-Regular.ttf https://www.lush.com/assets/fonts/inter/Inter-Regular.ttf — 148.2 KiB — 48 ms — font-display: swaphttps://www.lush.com/assets/fonts/handwritten/LushHandwritten_WLat_Bd.woffLushHandwritten_WLat_Bd... https://www.lush.com/assets/fonts/handwritten/LushHandwritten_WLat_Bd.woff — 61.8 KiB — 122 ms — font-display: swaphttps://www.lush.com/assets/fonts/inter/Inter-Bold.ttfInter-Bold.ttf https://www.lush.com/assets/fonts/inter/Inter-Bold.ttf — 158.6 KiB — 59 ms — font-display: swap
Inter-Regular.ttf ttf swap
Size 148 KB
Load time 48 ms
Start 694 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
LushHandwritten_WLat_Bd... woff swap
Size 62 KB
Load time 122 ms
Start 695 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Inter-Bold.ttf ttf swap
Size 159 KB
Load time 59 ms
Start 695 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~264 KB and ~528 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
72 requests over 3264ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 865 ms LCP 1.5 shttps://lush.com// https://lush.com/ — 301 — 402 B — 28 ms — h2https://www.lush.com/www.lush.com/ https://www.lush.com/ — 307 — 705 B — 443 ms — h2https://www.lush.com/uk/enwww.lush.com/uk/en https://www.lush.com/uk/en — 200 — 93.3 KiB — 76 ms — h2https://www.lush.com/cdn-cgi/image/width=1920,f=auto/https://res.cloudinary.com/lush/image/upload/v1776264632/collections/WBBD/WBBD-Banner-3.jpgwww.lush.com/cdn-cgi/image/width=19... https://www.lush.com/cdn-cgi/image/width=1920,f=auto/https://res.cloudinary.com/lush/image/upload/v1776264632/collections/WBBD/WBBD-Banner-3.jpg — 200 — 140.2 KiB — 35 ms — h3https://www.lush.com/_next/static/css/19afe5c3c4bf5f6c.csswww.lush.com/_next/static/css/19afe... https://www.lush.com/_next/static/css/19afe5c3c4bf5f6c.css — 200 — 24.0 KiB — 60 ms — h3https://www.lush.com/_next/static/css/a4f5974c684634a8.csswww.lush.com/_next/static/css/a4f59... https://www.lush.com/_next/static/css/a4f5974c684634a8.css — 200 — 1.3 KiB — 55 ms — h3https://www.lush.com/_next/static/chunks/webpack-855a510e4c289cb2.jswww.lush.com/_next/static/chunks/we... https://www.lush.com/_next/static/chunks/webpack-855a510e4c289cb2.js — 200 — 4.1 KiB — 48 ms — h3https://www.lush.com/_next/static/chunks/framework-945b357d4a851f4b.jswww.lush.com/_next/static/chunks/fr... https://www.lush.com/_next/static/chunks/framework-945b357d4a851f4b.js — 200 — 44.7 KiB — 70 ms — h3https://www.lush.com/_next/static/chunks/main-b7c9299ea2a9300d.jswww.lush.com/_next/static/chunks/ma... https://www.lush.com/_next/static/chunks/main-b7c9299ea2a9300d.js — 200 — 47.9 KiB — 80 ms — h3https://www.lush.com/_next/static/chunks/pages/_app-bb25c12dfb2b26cc.jswww.lush.com/_next/static/chunks/pa... https://www.lush.com/_next/static/chunks/pages/_app-bb25c12dfb2b26cc.js — 200 — 567.1 KiB — 103 ms — h3https://www.lush.com/_next/static/chunks/pages/%5Bchannel%5D/%5Blanguage%5D-b0eb36bf1c9d8b5b.jswww.lush.com/_next/static/chunks/pa... https://www.lush.com/_next/static/chunks/pages/%5Bchannel%5D/%5Blanguage%5D-b0eb36bf1c9d8b5b.js — 200 — 5.0 KiB — 94 ms — h3https://www.lush.com/_next/static/production-c4574453/_buildManifest.jswww.lush.com/_next/static/productio... https://www.lush.com/_next/static/production-c4574453/_buildManifest.js — 200 — 2.5 KiB — 96 ms — h3https://www.lush.com/_next/static/production-c4574453/_ssgManifest.jswww.lush.com/_next/static/productio... https://www.lush.com/_next/static/production-c4574453/_ssgManifest.js — 200 — 858 B — 96 ms — h3https://res.cloudinary.com/lush/image/upload/f_auto,q_auto,fl_lossy,w_36/v1590069065/lush_com/site_assets/flags/flag_square/uk.svgres.cloudinary.com/lush/image/uploa... https://res.cloudinary.com/lush/image/upload/f_auto,q_auto,fl_lossy,w_36/v1590069065/lush_com/site_assets/flags/flag_square/uk.svg — 200 — 910 B — 14 ms — h2data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%273…www.w3.org/2000/svg%27%20version=%2... data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%273… — 200 — 0 B — 0 ms — datadata:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7data:image/gif;base64,R0lGODlhAQABA... data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7 — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAH8AAAB/CAYAAADGvR0TAAAACXBIWXMAASvjAAEr4wGCUnw7AAAgA…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAH8AAAB/CAYAAADGvR0TAAAACXBIWXMAASvjAAEr4wGCUnw7AAAgA… — 200 — 0 B — 0 ms — datadata:image/gif;base64,R0lGODlhAQABAPAAAAAAAP///yH5BAAAAAAALAAAAAABAAEAAAICRAEAOw==data:image/gif;base64,R0lGODlhAQABA... data:image/gif;base64,R0lGODlhAQABAPAAAAAAAP///yH5BAAAAAAALAAAAAABAAEAAAICRAEAOw== — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cfilter id='b' colo…www.w3.org/2000/svg' %3E%3Cfilter i... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' %3E%3Cfilter id='b' colo… — 200 — 0 B — 0 ms — datahttps://www.lush.com/cdn-cgi/image/width=1920,f=auto/https://res.cloudinary.com/lush/image/upload/v1702032831/collections/Hero%20Images/Mask_of_M_NA.jpgwww.lush.com/cdn-cgi/image/width=19... https://www.lush.com/cdn-cgi/image/width=1920,f=auto/https://res.cloudinary.com/lush/image/upload/v1702032831/collections/Hero%20Images/Mask_of_M_NA.jpg — 200 — 479.4 KiB — 88 ms — h3https://www.lush.com/assets/fonts/inter/Inter-Regular.ttfwww.lush.com/assets/fonts/inter/Int... https://www.lush.com/assets/fonts/inter/Inter-Regular.ttf — 200 — 148.2 KiB — 48 ms — h3https://www.lush.com/assets/fonts/handwritten/LushHandwritten_WLat_Bd.woffwww.lush.com/assets/fonts/handwritt... https://www.lush.com/assets/fonts/handwritten/LushHandwritten_WLat_Bd.woff — 200 — 61.8 KiB — 122 ms — h3https://www.lush.com/assets/fonts/inter/Inter-Bold.ttfwww.lush.com/assets/fonts/inter/Int... https://www.lush.com/assets/fonts/inter/Inter-Bold.ttf — 200 — 158.6 KiB — 59 ms — h3https://www.lush.com/cdn-cgi/challenge-platform/scripts/jsd/main.jswww.lush.com/cdn-cgi/challenge-plat... https://www.lush.com/cdn-cgi/challenge-platform/scripts/jsd/main.js — 302 — 445 B — 492 ms — h3https://www.lush.com/_next/static/css/5c4826c56b72a529.csswww.lush.com/_next/static/css/5c482... https://www.lush.com/_next/static/css/5c4826c56b72a529.css — 200 — 930 B — 30 ms — h3https://www.lush.com/_next/static/chunks/7938.163588eab48a5777.jswww.lush.com/_next/static/chunks/79... https://www.lush.com/_next/static/chunks/7938.163588eab48a5777.js — 200 — 1.8 KiB — 26 ms — h3https://www.lush.com/_next/static/chunks/9997.cc7fe8894e34baec.jswww.lush.com/_next/static/chunks/99... https://www.lush.com/_next/static/chunks/9997.cc7fe8894e34baec.js — 200 — 2.9 KiB — 19 ms — h3https://www.lush.com/_next/static/chunks/2030.05244573a17a67ed.jswww.lush.com/_next/static/chunks/20... https://www.lush.com/_next/static/chunks/2030.05244573a17a67ed.js — 200 — 3.4 KiB — 26 ms — h3https://www.lush.com/_next/static/chunks/490.86623b72ad03c2c4.jswww.lush.com/_next/static/chunks/49... https://www.lush.com/_next/static/chunks/490.86623b72ad03c2c4.js — 200 — 4.5 KiB — 38 ms — h3https://www.lush.com/_next/static/chunks/8088-ed3d6da5d019b085.jswww.lush.com/_next/static/chunks/80... https://www.lush.com/_next/static/chunks/8088-ed3d6da5d019b085.js — 200 — 10.9 KiB — 38 ms — h3
0 ms 1.0 s 2.0 s 3.0 s FCP 865 ms LCP 1.5 shttps://lush.com// https://lush.com/ — 301 — 402 B — 28 ms — h2https://www.lush.com/www.lush.com/ https://www.lush.com/ — 307 — 705 B — 443 ms — h2https://www.lush.com/uk/enwww.lush.com/uk/en https://www.lush.com/uk/en — 200 — 93.3 KiB — 76 ms — h2https://www.lush.com/cdn-cgi/image/width=1920,f=auto/https://res.cloudinary.com/lush/image/upload/v1776264632/collections/WBBD/WBBD-Banner-3.jpgwww.lush.com/cdn-cgi/image/width=19... https://www.lush.com/cdn-cgi/image/width=1920,f=auto/https://res.cloudinary.com/lush/image/upload/v1776264632/collections/WBBD/WBBD-Banner-3.jpg — 200 — 140.2 KiB — 35 ms — h3https://www.lush.com/_next/static/css/19afe5c3c4bf5f6c.csswww.lush.com/_next/static/css/19afe... https://www.lush.com/_next/static/css/19afe5c3c4bf5f6c.css — 200 — 24.0 KiB — 60 ms — h3https://www.lush.com/_next/static/css/a4f5974c684634a8.csswww.lush.com/_next/static/css/a4f59... https://www.lush.com/_next/static/css/a4f5974c684634a8.css — 200 — 1.3 KiB — 55 ms — h3https://www.lush.com/_next/static/chunks/webpack-855a510e4c289cb2.jswww.lush.com/_next/static/chunks/we... https://www.lush.com/_next/static/chunks/webpack-855a510e4c289cb2.js — 200 — 4.1 KiB — 48 ms — h3https://www.lush.com/_next/static/chunks/framework-945b357d4a851f4b.jswww.lush.com/_next/static/chunks/fr... https://www.lush.com/_next/static/chunks/framework-945b357d4a851f4b.js — 200 — 44.7 KiB — 70 ms — h3https://www.lush.com/_next/static/chunks/main-b7c9299ea2a9300d.jswww.lush.com/_next/static/chunks/ma... https://www.lush.com/_next/static/chunks/main-b7c9299ea2a9300d.js — 200 — 47.9 KiB — 80 ms — h3https://www.lush.com/_next/static/chunks/pages/_app-bb25c12dfb2b26cc.jswww.lush.com/_next/static/chunks/pa... https://www.lush.com/_next/static/chunks/pages/_app-bb25c12dfb2b26cc.js — 200 — 567.1 KiB — 103 ms — h3https://www.lush.com/_next/static/chunks/pages/%5Bchannel%5D/%5Blanguage%5D-b0eb36bf1c9d8b5b.jswww.lush.com/_next/static/chunks/pa... 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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 2317ms · 783KB · $31/mo
www.lush.com
Other
Costly
Execution 1046ms
Transfer 45 KB
Monthly Cost $14/mo
www.lush.com
Other
Costly
Execution 647ms
Transfer 567 KB
Unused 27%
Monthly Cost $9/mo
www.lush.com
Other
Optional
Execution 182ms
Transfer 93 KB
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 167ms
Transfer 0 KB
Monthly Cost $2/mo
www.lush.com
Other
Optional
Execution 99ms
Transfer 0 KB
Monthly Cost $1/mo
www.lush.com
Other
Optional
Execution 63ms
Transfer 27 KB
Monthly Cost $1/mo
www.lush.com
Other
Optional
Execution 58ms
Transfer 48 KB
Monthly Cost $1/mo
www.lush.com
Other
Optional
Execution 55ms
Transfer 3 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.lush.com adds 1046ms and costs ~$14/month
  • www.lush.com adds 647ms and costs ~$9/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

www.lush.com takes 1046ms 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.lush.com takes 647ms 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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