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https://www.fashionnova.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
53
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.

2.12 s

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

540 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.

3.95 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.

8.32 s

Page Load Progression

1.1 s
2.2 s
3.3 s
4.4 s
5.4 s
6.5 s
7.6 s
8.7 s
Checks
14
6 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
15.6 MB transferred, 341 requests
FIX
15.6 MB transferred, 341 requests
Critical::
Page weighs 25.7 MB (15.6 MB transferred)
Warning::
JavaScript is 3.7 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.7 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::
341 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 3.3 g CO2 per page load
15.6 MB / 2.4 MB budget
15.6 MB transferred
341 requests
3.3 g CO2 per page load
Other 10.7 MiB 68%
JavaScript 3.7 MiB 24%
Images 592.2 KiB 4%
Fonts 387.4 KiB 2%
HTML 168.5 KiB 1%
CSS 80.3 KiB 1%
Other 27.0 KiB 0%
Other 17.6 KiB 0%
Other 6.6 KiB 0%
Other 4.0 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
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (15.5 MiB of 15.6 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
F
JS Execution Cost
Action
4877ms total JS execution
FIX
4877ms total JS execution
Warning::
https://cdn.shopify.com/oxygen-v2/29900/17398/3590...: 958ms CPU time
Warning::
Unattributable: 941ms CPU time
Warning::
https://cdn.shopify.com/oxygen-v2/29900/17398/3590...: 839ms CPU time
Warning::
https://www.fashionnova.com/: 499ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5R5...: 322ms CPU time
Warning::
Third-party scripts: 4378ms (90% of total)

Main Thread Breakdown

Script Evaluation 68% Other 17% Style & Layout 5% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3301398/assets/entry.client-CtwkvSLr.js958ms855ms0ms3rd
Unattributable941ms239ms0ms3rd
https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3301398/assets/index-CeUCdvwZ.js839ms796ms0ms3rd
https://www.fashionnova.com/499ms14ms16ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-5R54C8M322ms263ms23ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CHPZC04957&cx=c&gtm=4e6420h2193ms176ms14ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js121ms91ms4ms3rd
https://cdn.optimizely.com/js/26979700476.js115ms103ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-964745028114ms103ms10ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-17897115191&cx=c&gtm=4e6420h2102ms89ms12ms3rd

Showing top 10 of 19 scripts

F
JS Bundles
Action
191 scripts, 1.4 MB unused
FIX
191 scripts, 1.4 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...: 121 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-964...: 105 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.4 MB
1470 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
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://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js363 KB179 KB (49%)✓3rd
https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3301398/assets/root-CaL1mrvW.js158 KB121 KB (77%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-964745028&cx=c&gtm=4e6420h2144 KB105 KB (73%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=UA-45937828-1&cx=c&gtm=4e6420h2114 KB63 KB (55%)✓3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js110 KB58 KB (53%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CHPZC04957&cx=c&gtm=4e6420h2165 KB57 KB (34%)✓3rd
https://assets.bounceexchange.com/assets/smart-tag/versioned/main-v2_ca9cac840170c7a80240bb233fb08e5f.br.js120 KB55 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-964745028144 KB55 KB (38%)✓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.

No Cache-Control header

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

B
Image Optimization
46 images, 0 KB saveable
REVIEW
46 images, 0 KB saveable
Info::
All images are well-optimized
46 images 592 KB
0 oversized -0 KB
27 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-v2/29900/17398/35909/3301398/assets/mark-simonson-proxima-nova-regular-6iL5fLYO.otfmark-simonson-proxima-n... https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3301398/assets/mark-simonson-proxima-nova-regular-6iL5fLYO.otf — 38.4 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/oxygen-v2/29900/17398/35909/3301398/assets/field-gothic-BKscQOkG.otffield-gothic-BKscQOkG.otf https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3301398/assets/field-gothic-BKscQOkG.otf — 35.8 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/oxygen-v2/29900/17398/35909/3301398/assets/mark-simonson-proxima-nova-semibold-ChC6l_3H.otfmark-simonson-proxima-n... https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3301398/assets/mark-simonson-proxima-nova-semibold-ChC6l_3H.otf — 52.6 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/oxygen-v2/29900/17398/35909/3301398/assets/mark-simonson-proxima-nova-extrabold-zKE1y2Tz.otfmark-simonson-proxima-n... https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3301398/assets/mark-simonson-proxima-nova-extrabold-zKE1y2Tz.otf — 53.9 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/oxygen-v2/29900/17398/35909/3301398/assets/mark-simonson-proxima-nova-black-DQbc3XgK.otfmark-simonson-proxima-n... https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3301398/assets/mark-simonson-proxima-nova-black-DQbc3XgK.otf — 52.7 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 53 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 53 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
341 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
90% of JavaScript execution is third-party
First-party Third-party 4378ms · 1441KB · €23/mo
cdn.shopify.com
Other
Costly
Execution 958ms
Transfer 36 KB
Monthly Cost €5/mo
Unattributable
Other
Costly
Execution 941ms
Transfer 0 KB
Monthly Cost €5/mo
cdn.shopify.com
Other
Costly
Execution 839ms
Transfer 41 KB
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 322ms
Transfer 187 KB
Unused 29%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 193ms
Transfer 165 KB
Unused 34%
Monthly Cost €1/mo
Microsoft Clarity
Session Replay
Optional
Execution 121ms
Transfer 26 KB
Monthly Cost €1/mo
Optimizely
A/B Testing
Optional
Execution 115ms
Transfer 91 KB
Unused 46%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 114ms
Transfer 144 KB
Unused 38%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 102ms
Transfer 136 KB
Unused 38%
Monthly Cost €1/mo
assets.bounceexchange.com
Other
Optional
Execution 100ms
Transfer 120 KB
Unused 46%
Monthly Cost €1/mo
analytics.tiktok.com
Other
Optional
Execution 92ms
Transfer 110 KB
Unused 53%
Monthly Cost €0/mo
assets.bounceexchange.com
Other
Optional
Execution 86ms
Transfer 13 KB
Monthly Cost €0/mo
www.gstatic.com
Other
Optional
Execution 84ms
Transfer 0 KB
Unused 49%
Monthly Cost €0/mo
undgb.fashionnova.com
Other
Optional
Execution 71ms
Transfer 48 KB
Unused 59%
Monthly Cost €0/mo
transcend-cdn.com
Other
Optional
Execution 71ms
Transfer 93 KB
Unused 48%
Monthly Cost €0/mo
Google Tag Manager
Tag Manager
Optional
Execution 60ms
Transfer 114 KB
Unused 55%
Monthly Cost €0/mo
static.klaviyo.com
Other
Optional
Execution 56ms
Transfer 23 KB
Monthly Cost €0/mo
Facebook Pixel
Advertising
Optional
Execution 52ms
Transfer 95 KB
Unused 35%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • cdn.shopify.com adds 958ms and costs ~€5/month
  • Unattributable adds 941ms and costs ~€5/month
  • cdn.shopify.com adds 839ms and costs ~€4/month
  • Google Tag Manager adds 322ms and costs ~€2/month

90% 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 958ms 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 941ms 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 839ms 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 322ms 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

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

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

55% of Google Tag Manager'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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