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https://fashionnova.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
1
PASS
6
INFO
2

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

Mobile Desktop
56
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
69
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.

1.63 s

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

2.09 s

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

458 ms

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

0.002

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

4.19 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.

8.74 s

Page Load Progression

736 ms
1.5 s
2.2 s
2.9 s
3.7 s
4.4 s
5.2 s
5.9 s
Checks
14
6 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
4.9 MB transferred, 329 requests
FIX
4.9 MB transferred, 329 requests
Critical::
Page weighs 14.9 MB (4.9 MB transferred)
Warning::
JavaScript is 3.8 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.8 MB
Info::
Fonts are 387 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 387 KB
Warning::
329 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.0 g CO2 per page load
4.9 MB / 2.4 MB budget
4.9 MB transferred
329 requests
1.0 g CO2 per page load
JavaScript 3.8 MiB 77%
Images 441.6 KiB 9%
Fonts 387.0 KiB 8%
HTML 168.5 KiB 3%
CSS 81.0 KiB 2%
Other 23.9 KiB 0%
Other 17.4 KiB 0%
Other 7.2 KiB 0%
Other 4.2 KiB 0%
Other 0 B 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

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 (4.9 MiB of 4.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3829ms total JS execution
FIX
3829ms total JS execution
Warning::
https://cdn.shopify.com/oxygen-v2/29900/17398/3590...: 708ms CPU time
Warning::
https://cdn.shopify.com/oxygen-v2/29900/17398/3590...: 700ms CPU time
Warning::
Unattributable: 545ms CPU time
Warning::
https://www.fashionnova.com/: 434ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5R5...: 292ms CPU time
Warning::
Third-party scripts: 3829ms (100% of total)

Main Thread Breakdown

Script Evaluation 68% Other 14% Script Parsing & Compilation 8% Style & Layout 6%
ScriptTotalScriptingParse/CompileParty
https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3318113/assets/entry.client-ShI81eut.js708ms619ms0ms3rd
https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3318113/assets/index-CxT3hMUT.js700ms664ms0ms3rd
Unattributable545ms116ms0ms3rd
https://www.fashionnova.com/434ms10ms18ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5R54C8M292ms253ms30ms3rd
https://www.googletagmanager.com/gtag/destination?id=G-CHPZC04957&cx=c&gtm=4e6461181ms160ms20ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-17897115191&cx=c&gtm=4e6461146ms92ms14ms3rd
https://cdn.optimizely.com/js/26979700476.js116ms101ms14ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-964745028108ms94ms14ms3rd
https://assets.bounceexchange.com/assets/smart-tag/versioned/main-v2_e645891259bb60090bde423588e192e6.br.js97ms70ms24ms3rd

Showing top 10 of 17 scripts

F
JS Bundles
Action
191 scripts, 1.5 MB unused
FIX
191 scripts, 1.5 MB unused
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 179 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 179 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 179 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.shopify.com/oxygen-v2/29900/17398/3590...: 122 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CHPZ...: 110 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.5 MB
1520 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js363 KB179 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js0 KB179 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js363 KB179 KB (49%)✓3rd
https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3318113/assets/root-B1VWZC5S.js158 KB122 KB (78%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CHPZC04957&cx=c&gtm=4e6461165 KB110 KB (67%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-964745028&cx=c&gtm=4e6461144 KB105 KB (73%)✓3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js110 KB58 KB (53%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=G-CHPZC04957&cx=c&gtm=4e6461165 KB58 KB (35%)✓3rd
https://assets.bounceexchange.com/assets/smart-tag/versioned/main-v2_e645891259bb60090bde423588e192e6.br.js120 KB56 KB (47%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5R54C8M188 KB55 KB (30%)✓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
38 images, 0 KB saveable
REVIEW
38 images, 0 KB saveable
Info::
All images are well-optimized
38 images 442 KB
0 oversized -0 KB
19 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
10 fonts (387 KB)
PASS
10 fonts (387 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

387 KB total

Render-blocking

0

of 10

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 2.0 s FCP 1.6 s LCP 2.1 shttps://cdn.shopify.com/oxygen-v2/29900/17398/35909/3318113/assets/mark-simonson-proxima-nova-regular-6iL5fLYO.otfmark-simonson-proxima-n... https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3318113/assets/mark-simonson-proxima-nova-regular-6iL5fLYO.otf — 38.5 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/oxygen-v2/29900/17398/35909/3318113/assets/field-gothic-BKscQOkG.otffield-gothic-BKscQOkG.otf https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3318113/assets/field-gothic-BKscQOkG.otf — 36.2 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/oxygen-v2/29900/17398/35909/3318113/assets/mark-simonson-proxima-nova-semibold-ChC6l_3H.otfmark-simonson-proxima-n... https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3318113/assets/mark-simonson-proxima-nova-semibold-ChC6l_3H.otf — 52.1 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/oxygen-v2/29900/17398/35909/3318113/assets/mark-simonson-proxima-nova-extrabold-zKE1y2Tz.otfmark-simonson-proxima-n... https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3318113/assets/mark-simonson-proxima-nova-extrabold-zKE1y2Tz.otf — 54.0 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/oxygen-v2/29900/17398/35909/3318113/assets/mark-simonson-proxima-nova-black-DQbc3XgK.otfmark-simonson-proxima-n... https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3318113/assets/mark-simonson-proxima-nova-black-DQbc3XgK.otf — 52.3 KiB — 0 ms — font-display: swaphttps://use.typekit.net/af/e37e5a/00000000000000007735e60d/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3l https://use.typekit.net/af/e37e5a/00000000000000007735e60d/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3 — 29.7 KiB — 0 ms — font-display: swaphttps://use.typekit.net/af/d7ff92/00000000000000007735e609/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/d7ff92/00000000000000007735e609/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 29.8 KiB — 0 ms — font-display: swaphttps://use.typekit.net/af/99d25e/00000000000000007735e611/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n8&v=3l https://use.typekit.net/af/99d25e/00000000000000007735e611/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n8&v=3 — 30.5 KiB — 0 ms — font-display: swaphttps://use.typekit.net/af/846224/00000000000000007735e602/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n9&v=3l https://use.typekit.net/af/846224/00000000000000007735e602/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n9&v=3 — 30.1 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 0 ms — font-display: swap
mark-simonson-proxima-n... otf swap
Size 38 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
field-gothic-BKscQOkG.otf otf swap
Size 36 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
mark-simonson-proxima-n... otf swap
Size 52 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
mark-simonson-proxima-n... otf swap
Size 54 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
mark-simonson-proxima-n... otf swap
Size 52 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
l woff2 swap
Size 30 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 30 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 31 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 30 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 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 ~70 KB and ~140 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
329 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 3829ms · 1440KB · €20/mo
cdn.shopify.com
Other
Costly
Execution 708ms
Transfer 36 KB
Monthly Cost €4/mo
cdn.shopify.com
Other
Costly
Execution 700ms
Transfer 41 KB
Monthly Cost €4/mo
Unattributable
Other
Costly
Execution 545ms
Transfer 0 KB
Monthly Cost €3/mo
www.fashionnova.com
Other
Costly
Execution 434ms
Transfer 137 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Costly
Execution 292ms
Transfer 188 KB
Unused 30%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 181ms
Transfer 165 KB
Unused 35%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 146ms
Transfer 137 KB
Unused 39%
Monthly Cost €1/mo
Optimizely
A/B Testing
Optional
Execution 116ms
Transfer 91 KB
Unused 46%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 108ms
Transfer 145 KB
Unused 37%
Monthly Cost €1/mo
assets.bounceexchange.com
Other
Optional
Execution 97ms
Transfer 120 KB
Unused 47%
Monthly Cost €1/mo
www.gstatic.com
Other
Optional
Execution 97ms
Transfer 0 KB
Unused 49%
Monthly Cost €1/mo
undgb.fashionnova.com
Other
Optional
Execution 76ms
Transfer 48 KB
Unused 59%
Monthly Cost €0/mo
analytics.tiktok.com
Other
Optional
Execution 75ms
Transfer 110 KB
Unused 53%
Monthly Cost €0/mo
transcend-cdn.com
Other
Optional
Execution 70ms
Transfer 93 KB
Unused 48%
Monthly Cost €0/mo
assets.bounceexchange.com
Other
Optional
Execution 65ms
Transfer 11 KB
Monthly Cost €0/mo
Microsoft Clarity
Session Replay
Optional
Execution 62ms
Transfer 26 KB
Monthly Cost €0/mo
Facebook Pixel
Advertising
Optional
Execution 56ms
Transfer 95 KB
Unused 35%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • cdn.shopify.com adds 708ms and costs ~€4/month
  • cdn.shopify.com adds 700ms and costs ~€4/month
  • Unattributable adds 545ms and costs ~€3/month
  • www.fashionnova.com adds 434ms and costs ~€2/month
  • Google Tag Manager adds 292ms and costs ~€2/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.shopify.com takes 708ms 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 700ms 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 545ms 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.fashionnova.com takes 434ms 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 292ms 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 undgb.fashionnova.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

53% 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

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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