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https://hiutdenim.co.uk

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
4
REVIEW
1
PASS
7
INFO
2

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

Mobile Desktop
81
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.
92
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.

754 ms

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

3.30 s

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

14 ms

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

0.031

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

1.11 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.

3.53 s

Page Load Progression

511 ms
1.0 s
1.5 s
2.0 s
2.6 s
3.1 s
3.6 s
4.1 s
Checks
14
7 PASS 1 REVIEW 4 FIX
F
Page Weight Budget
Action
4.4 MB transferred, 92 requests
FIX
4.4 MB transferred, 92 requests
Critical::
Page weighs 6.6 MB (4.4 MB transferred)
Warning::
Images are 3.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.2 MB
Warning::
JavaScript is 1.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.0 MB
Info::
92 HTTP requests
Info::
Estimated 0.93 g CO2 per page load
4.4 MB / 2.4 MB budget
4.4 MB transferred
92 requests
0.93 g CO2 per page load
Images 3.2 MiB 72%
JavaScript 1.0 MiB 23%
Fonts 148.1 KiB 3%
HTML 24.9 KiB 1%
CSS 11.0 KiB 0%
Other 10.5 KiB 0%
Other 4.0 KiB 0%
Other 1.7 KiB 0%
Other 558 B 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

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 (4.4 MiB of 4.4 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
D
JS Bundles
Action
41 scripts, 374 KB unused
FIX
41 scripts, 374 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-Z6W5...: 114 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-Z6W5...: 68 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-176...: 57 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://chat.envolvetech.com/intermediate/latest/a...: 51 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://chat.envolvetech.com/intermediate/latest/a...: 36 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 374 KB
374 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-Z6W58KW94D&cx=c&gtm=4e6461176 KB114 KB (65%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-Z6W58KW94D176 KB68 KB (39%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-17676162793147 KB57 KB (39%)✓3rd
https://chat.envolvetech.com/intermediate/latest/assets/2-CKDZKHa_.js66 KB51 KB (79%)✓3rd
https://chat.envolvetech.com/intermediate/latest/app.js66 KB36 KB (56%)✓3rd
https://chat.envolvetech.com/intermediate/latest/assets/1-harOVhhe.js58 KB26 KB (45%)✓3rd
https://cdn.shopify.com/oxygen-v2/42066/36671/77025/3214919/assets/index-BgrGxcs1.js25 KB21 KB (87%)✓3rd
https://cdn.shopify.com/oxygen-v2/42066/36671/77025/3214919/assets/(_locale)-l0sNRNKZ.js0 KB—✓3rd
https://cdn.shopify.com/oxygen-v2/42066/36671/77025/3214919/assets/PaginatedResourceSection-_Pzdh9xA.js1 KB—✓3rd
https://cdn.shopify.com/oxygen-v2/42066/36671/77025/3214919/assets/dialog-CCCmQSjM.js8 KB—✓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
JS Execution Cost
653ms total JS execution
REVIEW
653ms total JS execution
Info::
https://cdn.shopify.com/oxygen-v2/42066/36671/7702...: 198ms CPU time
Info::
https://hiutdenim.co.uk/: 194ms CPU time
Info::
Unattributable: 123ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=AW-176...: 73ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-Z6W5...: 64ms CPU time
Warning::
Third-party scripts: 459ms (70% of total)

Main Thread Breakdown

Script Evaluation 53% Other 26% Style & Layout 11% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://cdn.shopify.com/oxygen-v2/42066/36671/77025/3214919/assets/components-DG4JpPRU.js198ms183ms0ms3rd
https://hiutdenim.co.uk/194ms8ms2ms1st
Unattributable123ms6ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-1767616279373ms58ms14ms3rd
https://www.googletagmanager.com/gtag/js?id=G-Z6W58KW94D64ms52ms12ms3rd
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
Image Optimization
14 images, 0 KB saveable
PASS
14 images, 0 KB saveable
Info::
All images are well-optimized
14 images 3.2 MB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
3 fonts (148 KB)
PASS
3 fonts (148 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

148 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 FCP 754 ms LCP 3.3 shttps://cdn.shopify.com/oxygen-v2/42066/36671/77025/3214919/fonts/HelveticaNowProDisplayBold/font.woff2font.woff2 https://cdn.shopify.com/oxygen-v2/42066/36671/77025/3214919/fonts/HelveticaNowProDisplayBold/font.woff2 — 57.4 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/oxygen-v2/42066/36671/77025/3214919/fonts/HelveticaNowProTextBold/font.woff2font.woff2 https://cdn.shopify.com/oxygen-v2/42066/36671/77025/3214919/fonts/HelveticaNowProTextBold/font.woff2 — 45.6 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/oxygen-v2/42066/36671/77025/3214919/fonts/HelveticaNowProTextRegular/font.woff2font.woff2 https://cdn.shopify.com/oxygen-v2/42066/36671/77025/3214919/fonts/HelveticaNowProTextRegular/font.woff2 — 45.0 KiB — 0 ms — font-display: swap
font.woff2 woff2 swap
Size 57 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
font.woff2 woff2 swap
Size 46 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
font.woff2 woff2 swap
Size 45 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)
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
92 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
70% of JavaScript execution is third-party
First-party Third-party 459ms · 381KB · £2/mo
cdn.shopify.com
Other
Optional
Execution 198ms
Transfer 57 KB
Monthly Cost £1/mo
Unattributable
Other
Optional
Execution 123ms
Transfer 0 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 73ms
Transfer 147 KB
Unused 39%
Monthly Cost £0/mo
Google Tag Manager
Tag Manager
Optional
Execution 64ms
Transfer 176 KB
Unused 39%
Monthly Cost £0/mo

70% 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

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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