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https://colourpop.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
23
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
71
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

2.48 s

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

5.66 s

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

2.94 s

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

0.277

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

12.00 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.

31.47 s

Page Load Progression

1.0 s
2.0 s
3.0 s
4.0 s
5.1 s
6.1 s
7.1 s
8.1 s
Checks
16
8 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
7.5 MB transferred, 685 requests
FIX
7.5 MB transferred, 685 requests
Critical::
Page weighs 14.1 MB (7.5 MB transferred)
Warning::
Images are 4.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.0 MB
Warning::
JavaScript is 2.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.0 MB
Warning::
685 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.6 g CO2 per page load
7.5 MB / 2.4 MB budget
7.5 MB transferred
685 requests
1.6 g CO2 per page load
Images 4.0 MiB 54%
JavaScript 2.0 MiB 26%
Other 877.5 KiB 11%
Other 333.3 KiB 4%
HTML 131.6 KiB 2%
Fonts 115.1 KiB 2%
Other 54.0 KiB 1%
CSS 19.6 KiB 0%
Other 9.3 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

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

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

F
JS Execution Cost
Action
25214ms total JS execution
FIX
25214ms total JS execution
Warning::
Unattributable: 8037ms CPU time
Warning::
https://colourpop.com/: 4685ms CPU time
Warning::
https://colourpop.com/cdn/shop/t/1219/assets/chunk...: 1883ms CPU time
Warning::
https://imgs.signifyd.com/7FReSCJI_usr_owJ?ad214aa...: 1782ms CPU time
Warning::
https://cdn-scripts.signifyd.com/o/lite.js?session...: 961ms CPU time
Warning::
Third-party scripts: 15448ms (61% of total)

Main Thread Breakdown

Script Evaluation 44% Other 35% Style & Layout 13%
ScriptTotalScriptingParse/CompileParty
Unattributable8037ms1100ms0ms3rd
https://colourpop.com/4685ms1779ms42ms1st
https://colourpop.com/cdn/shop/t/1219/assets/chunk-swiper-element-bundle-DRhDKJlJ.js1883ms400ms1ms1st
https://imgs.signifyd.com/7FReSCJI_usr_owJ?ad214aa9130833f7=ufQIkj-ZarkX-yksDxyupR2YGPBUa4jicM7EXxU3vj2Hzzv8T028TkDM5pXM5qt49LPoYCK7OKWhFunhFg8Slcu6-wNDtYOfOkyn5X5ccXCIEJIwvyfZYMaRrnxJCl0Pr9voNsNoAhY9Lht2pnl_I6RuTCqfsm-_M3uQIJuVLj4ttLjAYf-eZnSHMR02_HZl&jb=3e352c26627967753f4e6b667f7a26627b6735496464726d61662f32383b39266871607d3741687a67656d2e60736d77357678756d2c6273603f4160786d6d6d2d3a38393e361782ms1337ms26ms3rd
https://cdn-scripts.signifyd.com/o/lite.js?sessionId=hWNAmOXQbws9kBq899XlZDQB&ping=false&profile=true&pageURL=https%253A%252F%252Fcolourpop.com%252F961ms831ms15ms3rd
https://colourpop.com/cdn/shopifycloud/storefront/assets/storefront/load_feature-496de5fe.js920ms918ms1ms1st
https://widget.gotolstoy.com/we/widget.js834ms376ms1ms3rd
https://colourpop.com/cdn/shop/t/1219/assets/-component-country-select.js?v=114194481290742017481770761465516ms370ms0ms1st
https://colourpop.com/cdn/shop/t/1219/assets/-vendor-swiper.js?v=125545043974683086481770761464503ms190ms0ms1st
https://cdn-static.okendo.io/reviews-widget-plus/js/modules/okendo-star-rating.4a060e36.js457ms439ms5ms3rd

Showing top 10 of 38 scripts

D
JS Bundles
Action
295 scripts, 453 KB unused
FIX
295 scripts, 453 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WQK...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WQK...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.506.io/eg/script.js?shop=colourpop-prd...: 52 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://na-library.klarnaservices.com/v1/1.0.111/s...: 52 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://play.gotolstoy.com/widget-v2/widget.js: 47 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 453 KB
453 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-WQKQL2VQ155 KB67 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WQKQL2VQ155 KB67 KB (43%)✓3rd
https://cdn.506.io/eg/script.js?shop=colourpop-prd.myshopify.com&v=978 KB52 KB (67%)✓3rd
https://na-library.klarnaservices.com/v1/1.0.111/sdk.js110 KB52 KB (48%)✓3rd
https://play.gotolstoy.com/widget-v2/widget.js79 KB47 KB (59%)✓3rd
https://cdn.9gtb.com/script.js?rev=9b8201f61 KB34 KB (57%)✓3rd
https://colourpop.com/apps/proxy/script/shopify/market/nosto.js?merchant=shopify-13380845&market=20836581458&locale=en52 KB32 KB (63%)✓1st
https://cdn.attn.tv/tag/2026-latest/unified-tag.js?v=2026-latest_90ae5a3c87649 KB29 KB (60%)✓3rd
https://colourpop.com/cdn/wpm/b0e8c7c7aw41bd75a1p837d7fd4m8b145375m.js61 KB26 KB (44%)✓1st
https://colourpop.com/cdn/shop/t/1219/assets/chunk-swiper-element-bundle-DRhDKJlJ.js47 KB23 KB (51%)✓1st

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.
Info::
ETag present — enables conditional (304) responses

No Cache-Control header

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

B
Third-Party Impact
44% third-party, 0 ms blocking
REVIEW
44% third-party, 0 ms blocking
Info::
Third-party code accounts for 44% of page weight (3.3 MiB of 7.5 MiB)
Info::
Third-party blocking time is low (0 ms)
56%
44%
First-party Third-party
B
Image Optimization
277 images, 0 KB saveable
REVIEW
277 images, 0 KB saveable
Info::
All images are well-optimized
277 images 3.9 MB
0 oversized -0 KB
195 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
3 fonts (115 KB)
PASS
3 fonts (115 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

115 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.5 s LCP 5.7 shttps://colourpop.com/cdn/shop/t/1219/assets/VisbyCF-Medium.woffVisbyCF-Medium.woff https://colourpop.com/cdn/shop/t/1219/assets/VisbyCF-Medium.woff — 26.2 KiB — 0 ms — font-display: swaphttps://colourpop.com/cdn/shop/t/1219/assets/VisbyCF-Bold.woffVisbyCF-Bold.woff https://colourpop.com/cdn/shop/t/1219/assets/VisbyCF-Bold.woff — 25.7 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/shop-assets/static_uploads/shoplift/GTStandard-MRegular.woff2GTStandard-MRegular.woff2 https://cdn.shopify.com/shop-assets/static_uploads/shoplift/GTStandard-MRegular.woff2 — 63.2 KiB — 0 ms — font-display: swap
VisbyCF-Medium.woff woff swap
Size 26 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
VisbyCF-Bold.woff woff swap
Size 26 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
GTStandard-MRegular.woff2 woff2 swap
Size 63 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 ~16 KB and ~32 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
4
preload
—
dns-prefetch
1
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
685 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
61% of JavaScript execution is third-party
First-party Third-party 15448ms · 781KB · €82/mo
Unattributable
Other
Costly
Execution 8037ms
Transfer 0 KB
Monthly Cost €43/mo
imgs.signifyd.com
Other
Costly
Execution 1782ms
Transfer 60 KB
Monthly Cost €9/mo
cdn-scripts.signifyd.com
Other
Costly
Execution 961ms
Transfer 51 KB
Monthly Cost €5/mo
widget.gotolstoy.com
Other
Costly
Execution 834ms
Transfer 38 KB
Monthly Cost €4/mo
cdn-static.okendo.io
Other
Costly
Execution 457ms
Transfer 5 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Costly
Execution 423ms
Transfer 155 KB
Unused 43%
Monthly Cost €2/mo
jsDelivr
CDN
Costly
Execution 402ms
Transfer 16 KB
Monthly Cost €2/mo
jsDelivr
CDN
Costly
Execution 357ms
Transfer 21 KB
Monthly Cost €2/mo
widget.gotolstoy.com
Other
Costly
Execution 322ms
Transfer 19 KB
Monthly Cost €2/mo
cdn-static.okendo.io
Other
Costly
Execution 300ms
Transfer 17 KB
Monthly Cost €2/mo
a42cdn.usablenet.com
Other
Costly
Execution 270ms
Transfer 5 KB
Monthly Cost €1/mo
cdn.attn.tv
Other
Optional
Execution 167ms
Transfer 49 KB
Unused 60%
Monthly Cost €1/mo
play.gotolstoy.com
Other
Optional
Execution 165ms
Transfer 79 KB
Unused 59%
Monthly Cost €1/mo
cdn.shopify.com
Other
Optional
Execution 144ms
Transfer 31 KB
Monthly Cost €1/mo
imgs.signifyd.com
Other
Optional
Execution 96ms
Transfer 15 KB
Monthly Cost €1/mo
ajax.googleapis.com
Other
Optional
Execution 96ms
Transfer 34 KB
Unused 70%
Monthly Cost €1/mo
cdn.506.io
Other
Optional
Execution 93ms
Transfer 78 KB
Unused 67%
Monthly Cost €0/mo
cdn.9gtb.com
Other
Optional
Execution 85ms
Transfer 61 KB
Unused 57%
Monthly Cost €0/mo
cdn-scripts.signifyd.com
Other
Optional
Execution 79ms
Transfer 2 KB
Monthly Cost €0/mo
cdn-scripts.signifyd.com
Other
Optional
Execution 70ms
Transfer 7 KB
Monthly Cost €0/mo
rapid-cdn.yottaa.com
Other
Optional
Execution 66ms
Transfer 25 KB
Monthly Cost €0/mo
jsDelivr
CDN
Optional
Execution 66ms
Transfer 3 KB
Monthly Cost €0/mo
cdn-static.okendo.io
Other
Optional
Execution 65ms
Transfer 1 KB
Monthly Cost €0/mo
static.klaviyo.com
Other
Optional
Execution 63ms
Transfer 8 KB
Monthly Cost €0/mo
static.shopmy.us
Other
Optional
Execution 51ms
Transfer 2 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • Unattributable adds 8037ms and costs ~€43/month
  • imgs.signifyd.com adds 1782ms and costs ~€9/month
  • cdn-scripts.signifyd.com adds 961ms and costs ~€5/month
  • widget.gotolstoy.com adds 834ms and costs ~€4/month
  • cdn-static.okendo.io adds 457ms and costs ~€2/month
  • Google Tag Manager adds 423ms and costs ~€2/month
  • jsDelivr adds 402ms and costs ~€2/month
  • jsDelivr adds 357ms and costs ~€2/month
  • widget.gotolstoy.com adds 322ms and costs ~€2/month
  • cdn-static.okendo.io adds 300ms and costs ~€2/month
  • a42cdn.usablenet.com adds 270ms and costs ~€1/month

61% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 8037ms 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

imgs.signifyd.com takes 1782ms 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-scripts.signifyd.com takes 961ms 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

widget.gotolstoy.com takes 834ms 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-static.okendo.io takes 457ms 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 423ms 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

jsDelivr takes 402ms 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

jsDelivr takes 357ms 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

widget.gotolstoy.com 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

cdn-static.okendo.io takes 300ms 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

a42cdn.usablenet.com takes 270ms 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

60% of cdn.attn.tv'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 play.gotolstoy.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

70% of ajax.googleapis.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

67% of cdn.506.io'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

57% of cdn.9gtb.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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