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https://colourpop.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
1
PASS
7
INFO
2

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

Mobile Desktop
68
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
82
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.

830 ms

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

2.49 s

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

239 ms

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

0.065

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

4.07 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.

8.48 s

Page Load Progression

975 ms
1.9 s
2.9 s
3.9 s
4.9 s
5.8 s
6.8 s
7.8 s
Checks
14
7 PASS 1 REVIEW 4 FIX
F
Page Weight Budget
Action
10.3 MB transferred, 780 requests
FIX
10.3 MB transferred, 780 requests
Critical::
Page weighs 17.8 MB (10.3 MB transferred)
Warning::
Images are 6.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 6.4 MB
Warning::
JavaScript is 2.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.4 MB
Warning::
780 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.2 g CO2 per page load
10.3 MB / 2.4 MB budget
10.3 MB transferred
780 requests
2.2 g CO2 per page load
Images 6.4 MiB 62%
JavaScript 2.4 MiB 23%
Other 849.8 KiB 8%
Other 387.6 KiB 4%
HTML 131.1 KiB 1%
Fonts 115.0 KiB 1%
Other 56.6 KiB 1%
CSS 21.7 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
6071ms total JS execution
FIX
6071ms total JS execution
Warning::
Unattributable: 1925ms CPU time
Warning::
https://colourpop.com/: 1167ms CPU time
Warning::
https://imgs.signifyd.com/oZhn1__Ba00dOktN?918762f...: 527ms CPU time
Warning::
https://colourpop.com/cdn/shop/t/1219/assets/chunk...: 497ms CPU time
Warning::
https://cdn-scripts.signifyd.com/o/lite.js?session...: 262ms CPU time
Warning::
Third-party scripts: 3901ms (64% of total)

Main Thread Breakdown

Script Evaluation 41% Other 35% Style & Layout 16%
ScriptTotalScriptingParse/CompileParty
Unattributable1925ms222ms0ms3rd
https://colourpop.com/1167ms325ms17ms1st
https://imgs.signifyd.com/oZhn1__Ba00dOktN?918762f5e15ee2e5=ETyZQH2oD0gUTvyR_v9IenVF_MM-0dtUZ1p3P3sr9MmlXOFwnEfoCqm4BTFV8bUYrkVeD-nBBLqa6-dqthM033DUtPlAwbR2MPcbWMkQnXjgVaLRO6OJdH2LoT1itBYfban_-25c05-d_3_9JH3hJGpQc1-3Zb0JCFLlGntiU3zVWcmCrZA7t8lmoLq5htug&jb=3d322c2662796d7d3f4c6364757a2e68716d3f466b6c75782e6879627d374160706f676f26687b603f416a786d6f65253a323b343e527ms347ms7ms3rd
https://colourpop.com/cdn/shop/t/1219/assets/chunk-swiper-element-bundle-DRhDKJlJ.js497ms62ms0ms1st
https://cdn-scripts.signifyd.com/o/lite.js?sessionId=hWNAmObiveOJ4GlVwwbO7GEt&ping=false&profile=true&pageURL=https%253A%252F%252Fcolourpop.com%252F262ms188ms3ms3rd
https://widget.gotolstoy.com/we/widget.js207ms104ms0ms3rd
https://colourpop.com/cdn/shopifycloud/storefront/assets/storefront/load_feature-496de5fe.js187ms185ms1ms1st
https://colourpop.com/cdn/shop/t/1219/assets/-vendor-swiper.js?v=125545043974683086481770761464143ms55ms0ms1st
https://cdn.jsdelivr.net/npm/@appmate/wishlist@5.29.0/wishlist-element.js139ms46ms0ms3rd
https://cdn-static.okendo.io/reviews-widget-plus/js/modules/okendo-widget-init.2fbd4ec6.js121ms93ms2ms3rd

Showing top 10 of 21 scripts

F
JS Bundles
Action
326 scripts, 587 KB unused
FIX
326 scripts, 587 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://shopify-extension.getredo.com/main.js?widg...: 62 KB unused (58%)
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://cdn.506.io/eg/script.js?shop=colourpop-prd...: 52 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 587 KB
587 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://shopify-extension.getredo.com/main.js?widget_id=ijdkbbsinimd96r&shop=colourpop-prd.myshopify.com107 KB62 KB (58%)✓3rd
https://na-library.klarnaservices.com/v1/1.0.111/sdk.js110 KB52 KB (48%)✓3rd
https://cdn.506.io/eg/script.js?shop=colourpop-prd.myshopify.com&v=978 KB52 KB (67%)✓3rd
https://shopify-extension.getredo.com/3831-91a24011.js49 KB35 KB (71%)✓3rd
https://shopify-extension.getredo.com/6447-8a84bb1a.js41 KB35 KB (86%)✓3rd
https://cdn.9gtb.com/script.js?rev=9b8201f60 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 (59%)✓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.
Info::
ETag present — enables conditional (304) responses

No Cache-Control header

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

B
Image Optimization
332 images, 0 KB saveable
REVIEW
332 images, 0 KB saveable
Info::
All images are well-optimized
332 images 6.3 MB
0 oversized -0 KB
201 legacy format
0 missing dimensions CLS risk
A
Third-Party Impact
37% third-party, 0 ms blocking
PASS
37% third-party, 0 ms blocking
Info::
Third-party code accounts for 37% of page weight (3.8 MiB of 10.3 MiB)
Info::
Third-party blocking time is low (0 ms)
63%
37%
First-party Third-party
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 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 830 ms LCP 2.5 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
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
780 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
64% of JavaScript execution is third-party
First-party Third-party 3901ms · 593KB · €21/mo
Unattributable
Other
Costly
Execution 1925ms
Transfer 0 KB
Monthly Cost €10/mo
imgs.signifyd.com
Other
Costly
Execution 527ms
Transfer 60 KB
Monthly Cost €3/mo
cdn-scripts.signifyd.com
Other
Costly
Execution 262ms
Transfer 51 KB
Monthly Cost €1/mo
widget.gotolstoy.com
Other
Costly
Execution 207ms
Transfer 38 KB
Monthly Cost €1/mo
jsDelivr
CDN
Optional
Execution 139ms
Transfer 21 KB
Monthly Cost €1/mo
cdn-static.okendo.io
Other
Optional
Execution 121ms
Transfer 17 KB
Monthly Cost €1/mo
cdn-static.okendo.io
Other
Optional
Execution 109ms
Transfer 5 KB
Monthly Cost €1/mo
jsDelivr
CDN
Optional
Execution 96ms
Transfer 16 KB
Monthly Cost €1/mo
shopify-extension.getredo.com
Other
Optional
Execution 91ms
Transfer 107 KB
Unused 58%
Monthly Cost €0/mo
widget.gotolstoy.com
Other
Optional
Execution 84ms
Transfer 19 KB
Monthly Cost €0/mo
Google Tag Manager
Tag Manager
Optional
Execution 82ms
Transfer 155 KB
Unused 43%
Monthly Cost €0/mo
shopify-extension.getredo.com
Other
Optional
Execution 81ms
Transfer 43 KB
Unused 64%
Monthly Cost €0/mo
a42cdn.usablenet.com
Other
Optional
Execution 71ms
Transfer 5 KB
Monthly Cost €0/mo
widget.gotolstoy.com
Other
Optional
Execution 56ms
Transfer 6 KB
Monthly Cost €0/mo
shopify-extension.getredo.com
Other
Optional
Execution 52ms
Transfer 49 KB
Unused 71%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • Unattributable adds 1925ms and costs ~€10/month
  • imgs.signifyd.com adds 527ms and costs ~€3/month
  • cdn-scripts.signifyd.com adds 262ms and costs ~€1/month
  • widget.gotolstoy.com adds 207ms and costs ~€1/month

64% 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 1925ms 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 527ms 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 262ms 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 207ms 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

58% of shopify-extension.getredo.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

64% of shopify-extension.getredo.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

71% of shopify-extension.getredo.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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