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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
26
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
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.

10.83 s

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

18.21 s

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

7.29 s

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

0.004

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

11.21 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.

42.23 s

Page Load Progression

392 ms
784 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.7 s
3.1 s
Checks
14
6 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
11.3 MB transferred, 338 requests
FIX
11.3 MB transferred, 338 requests
Critical::
Page weighs 21.0 MB (11.3 MB transferred)
Warning::
JavaScript is 4.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 4.2 MB
Info::
Fonts are 509 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 509 KB
Warning::
338 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.4 g CO2 per page load
11.3 MB / 2.4 MB budget
11.3 MB transferred
338 requests
2.4 g CO2 per page load
Other 5.7 MiB 50%
JavaScript 4.2 MiB 37%
Images 556.3 KiB 5%
Fonts 508.6 KiB 4%
HTML 172.1 KiB 1%
CSS 84.9 KiB 1%
Other 66.8 KiB 1%
Other 17.4 KiB 0%
Other 6.6 KiB 0%
Other 3.9 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
98% third-party, 0 ms blocking
FIX
98% third-party, 0 ms blocking
Warning::
Third-party code accounts for 98% of page weight (11.1 MiB of 11.3 MiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
F
JS Execution Cost
Action
19681ms total JS execution
FIX
19681ms total JS execution
Warning::
https://cdn.shopify.com/oxygen-v2/29900/17398/3590...: 3637ms CPU time
Warning::
https://cdn.shopify.com/oxygen-v2/29900/17398/3590...: 3216ms CPU time
Warning::
Unattributable: 3164ms CPU time
Warning::
https://www.fashionnova.com/: 1433ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5R5...: 1419ms CPU time
Warning::
Third-party scripts: 18247ms (93% of total)

Main Thread Breakdown

Script Evaluation 69% Other 15% Script Parsing & Compilation 6% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3301398/assets/index-CeUCdvwZ.js3637ms3318ms2ms3rd
https://cdn.shopify.com/oxygen-v2/29900/17398/35909/3301398/assets/entry.client-CtwkvSLr.js3216ms2912ms1ms3rd
Unattributable3164ms695ms0ms3rd
https://www.fashionnova.com/1433ms77ms93ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-5R54C8M1419ms1151ms140ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CHPZC04957&cx=c&gtm=4e6411684ms622ms56ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-964745028604ms551ms45ms3rd
https://cdn.optimizely.com/js/26979700476.js571ms541ms28ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-17897115191&cx=c&gtm=4e6411425ms382ms40ms3rd
https://transcend-cdn.com/cm/bb43296e-7ad2-48ef-8961-8ac1d2ed5b8c/ui.js391ms266ms124ms3rd

Showing top 10 of 37 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...: 119 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-964...: 104 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.4 MB
1387 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.js851 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 KB119 KB (75%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-964745028&cx=c&gtm=4e6411144 KB104 KB (73%)✓3rd
https://assets.bounceexchange.com/assets/smart-tag/versioned/main-v2_ca9cac840170c7a80240bb233fb08e5f.br.js120 KB66 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=4e6411164 KB57 KB (35%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-964745028144 KB54 KB (38%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5R54C8M187 KB54 KB (29%)✓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
31 images, 0 KB saveable
REVIEW
31 images, 0 KB saveable
Info::
All images are well-optimized
31 images 556 KB
0 oversized -0 KB
16 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
13 fonts (509 KB)
PASS
13 fonts (509 KB)
Info::
13 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

13

509 KB total

Render-blocking

0

of 13

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 16.0 s 18.0 s FCP 10.8 s LCP 18.2 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://creatives.attn.tv/fashionnova/Titling%20Gothic%20FB%20Wide%20Bold_6ff4e965.otfTitling%20Gothic%20FB%2... https://creatives.attn.tv/fashionnova/Titling%20Gothic%20FB%20Wide%20Bold_6ff4e965.otf — 25.1 KiB — 0 ms — font-display: swaphttps://creatives.attn.tv/fashionnova/ProximaNova-Regular_5683b0c6.otfProximaNova-Regular_568... https://creatives.attn.tv/fashionnova/ProximaNova-Regular_5683b0c6.otf — 40.5 KiB — 0 ms — font-display: swaphttps://creatives.attn.tv/fashionnova/Proxima-Nova-Black_9ff65377.otfProxima-Nova-Black_9ff6... https://creatives.attn.tv/fashionnova/Proxima-Nova-Black_9ff65377.otf — 55.6 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
Titling%20Gothic%20FB%2... otf swap
Size 25 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
ProximaNova-Regular_568... otf swap
Size 40 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
Proxima-Nova-Black_9ff6... otf swap
Size 56 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 ~106 KB and ~212 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
—
preload
3
dns-prefetch
—
prefetch
—

3 resource hints configured

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
338 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
93% of JavaScript execution is third-party
First-party Third-party 18247ms · 1901KB · €97/mo
cdn.shopify.com
Other
Costly
Execution 3637ms
Transfer 41 KB
Monthly Cost €19/mo
cdn.shopify.com
Other
Costly
Execution 3216ms
Transfer 36 KB
Monthly Cost €17/mo
Unattributable
Other
Costly
Execution 3164ms
Transfer 0 KB
Monthly Cost €17/mo
Google Tag Manager
Tag Manager
Costly
Execution 1419ms
Transfer 187 KB
Unused 29%
Monthly Cost €8/mo
Google Tag Manager
Tag Manager
Costly
Execution 684ms
Transfer 164 KB
Unused 35%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 604ms
Transfer 144 KB
Unused 38%
Monthly Cost €3/mo
Optimizely
A/B Testing
Costly
Execution 571ms
Transfer 91 KB
Unused 46%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 425ms
Transfer 136 KB
Unused 39%
Monthly Cost €2/mo
transcend-cdn.com
Other
Costly
Execution 391ms
Transfer 93 KB
Unused 48%
Monthly Cost €2/mo
www.gstatic.com
Other
Costly
Execution 387ms
Transfer 0 KB
Unused 49%
Monthly Cost €2/mo
Facebook Pixel
Advertising
Costly
Execution 343ms
Transfer 95 KB
Unused 34%
Monthly Cost €2/mo
analytics.tiktok.com
Other
Costly
Execution 279ms
Transfer 110 KB
Unused 53%
Monthly Cost €1/mo
assets.bounceexchange.com
Other
Costly
Execution 272ms
Transfer 120 KB
Unused 55%
Monthly Cost €1/mo
undgb.fashionnova.com
Other
Costly
Execution 256ms
Transfer 48 KB
Monthly Cost €1/mo
api.bounceexchange.com
Other
Costly
Execution 249ms
Transfer 1 KB
Monthly Cost €1/mo
Microsoft Clarity
Session Replay
Costly
Execution 241ms
Transfer 26 KB
Monthly Cost €1/mo
static.klaviyo.com
Other
Costly
Execution 227ms
Transfer 23 KB
Monthly Cost €1/mo
Facebook Pixel
Advertising
Optional
Execution 167ms
Transfer 37 KB
Monthly Cost €1/mo
sc-static.net
Other
Optional
Execution 158ms
Transfer 25 KB
Monthly Cost €1/mo
analytics.tiktok.com
Other
Optional
Execution 145ms
Transfer 40 KB
Monthly Cost €1/mo
j.northbeam.io
Other
Optional
Execution 142ms
Transfer 33 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 140ms
Transfer 144 KB
Unused 73%
Monthly Cost €1/mo
cdn.shopify.com
Other
Optional
Execution 129ms
Transfer 9 KB
Monthly Cost €1/mo
assets.bounceexchange.com
Other
Optional
Execution 123ms
Transfer 16 KB
Monthly Cost €1/mo
assets.bounceexchange.com
Other
Optional
Execution 93ms
Transfer 1 KB
Monthly Cost €0/mo
transcend-cdn.com
Other
Optional
Execution 92ms
Transfer 55 KB
Unused 46%
Monthly Cost €0/mo
assets.bounceexchange.com
Other
Optional
Execution 89ms
Transfer 16 KB
Monthly Cost €0/mo
static-tracking.klaviyo.com
Other
Optional
Execution 85ms
Transfer 19 KB
Monthly Cost €0/mo
assets.bounceexchange.com
Other
Optional
Execution 85ms
Transfer 30 KB
Monthly Cost €0/mo
static-tracking.klaviyo.com
Other
Optional
Execution 83ms
Transfer 14 KB
Monthly Cost €0/mo
static.klaviyo.com
Other
Optional
Execution 72ms
Transfer 8 KB
Monthly Cost €0/mo
tags.creativecdn.com
Other
Optional
Execution 62ms
Transfer 3 KB
Monthly Cost €0/mo
assets.bounceexchange.com
Other
Optional
Execution 60ms
Transfer 106 KB
Monthly Cost €0/mo
cdn.attn.tv
Other
Optional
Execution 54ms
Transfer 8 KB
Monthly Cost €0/mo
cdn.shopify.com
Other
Optional
Execution 53ms
Transfer 20 KB
Monthly Cost €0/mo
j.northbeam.io
Other
Optional
Execution 50ms
Transfer 5 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • cdn.shopify.com adds 3637ms and costs ~€19/month
  • cdn.shopify.com adds 3216ms and costs ~€17/month
  • Unattributable adds 3164ms and costs ~€17/month
  • Google Tag Manager adds 1419ms and costs ~€8/month
  • Google Tag Manager adds 684ms and costs ~€4/month
  • Google Tag Manager adds 604ms and costs ~€3/month
  • Optimizely adds 571ms and costs ~€3/month
  • Google Tag Manager adds 425ms and costs ~€2/month
  • transcend-cdn.com adds 391ms and costs ~€2/month
  • www.gstatic.com adds 387ms and costs ~€2/month
  • Facebook Pixel adds 343ms and costs ~€2/month
  • analytics.tiktok.com adds 279ms and costs ~€1/month
  • assets.bounceexchange.com adds 272ms and costs ~€1/month
  • undgb.fashionnova.com adds 256ms and costs ~€1/month
  • api.bounceexchange.com adds 249ms and costs ~€1/month
  • Microsoft Clarity adds 241ms and costs ~€1/month
  • static.klaviyo.com adds 227ms and costs ~€1/month

93% 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 3637ms 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 3216ms 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 3164ms 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 1419ms 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 684ms 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 604ms 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

Optimizely takes 571ms 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 425ms 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

transcend-cdn.com takes 391ms 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.gstatic.com takes 387ms 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

Facebook Pixel takes 343ms 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

analytics.tiktok.com takes 279ms 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

assets.bounceexchange.com takes 272ms 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

55% of assets.bounceexchange.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

undgb.fashionnova.com takes 256ms 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

api.bounceexchange.com takes 249ms 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

Microsoft Clarity takes 241ms 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

static.klaviyo.com takes 227ms 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

73% 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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