LCP
Largest Contentful Paint
16.6s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Remove Unused JavaScript Code
How to optimize joebrowns.co.uk
Generic SiteScore: 40/100Analyzed February 2026
Remove Unused JavaScript Code
High Impact+25 points estimated
Why It Matters
Unused JavaScript wastes 1,086 KiB and delays LCP by 1.8 seconds, severely impacting page performance.
How to Fix
Defer reCAPTCHA loading until user interaction with forms. Remove unused Google Tag Manager features and load GTM conditionally. Split JavaScript bundles to load only required code per page. Use dynamic imports for non-critical functionality.
0Poor
What This Score Means
A score of 40 falls in the "Poor" range (50-89). While it is better than poor (0-49), you should aim for 90+ to provide an optimal user experience and maximize SEO benefits.
This site is slower than approximately 35% of similar sites. The main issues affecting performance are image optimization, JavaScript execution time, and layout stability.
Addressing these issues could improve your conversion rate by 15-20% and boost your search engine rankings.
Core Web Vitals Analysis
INP
Interaction to Next Paint
275ms
Needs Improvement
Good: < 200ms
Measures how quickly the page responds to user interactions
CLS
Cumulative Layout Shift
0.00
Good
Good: < 0.1
Measures visual stability - how much content shifts during page load
AI Performance Analysis
This Joe Browns e-commerce site has severe performance issues with a critically low score of 40/100. The biggest problem is excessive unused JavaScript, particularly from Google reCAPTCHA and tracking scripts, which is wasting over 1MB of data and adding 1.8 seconds to page load times. The site's Largest Contentful Paint takes an unacceptable 16.6 seconds, primarily due to poor resource loading and caching strategies. To improve performance, prioritize removing or deferring unused JavaScript, implement better caching for third-party resources like PayPal and Feefo widgets, and optimize the numerous oversized product images that are loading at higher resolutions than displayed.
Other Optimization Recommendations
Optimize Image Delivery System
High Impact+20 points estimatedWhy It Matters:
Images are oversized for their display dimensions and lack proper compression, adding 185 KiB of waste and 1.05s to LCP.
How to Fix:
Implement responsive images with srcset for different screen sizes. Add fetchpriority='high' to the main product image. Compress images further and serve WebP format. Resize thumbnail images to match their 91x108px display size instead of loading 334x400px versions.
Implement Efficient Cache Headers
Medium Impact+15 points estimatedWhy It Matters:
Poor caching wastes 803 KiB on repeat visits and adds 900ms to LCP for returning users.
How to Fix:
Set longer cache lifetimes for Feefo widgets (currently 5 minutes, increase to 24 hours). Extend PayPal SDK cache from 1 hour to 7 days. Add proper cache headers for third-party scripts. Implement service worker for critical resource caching.
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Related Performance Analyses
More Generic Speed Tests
Generic Performance Resources
Remove Unused JavaScript Code
Google Tag Manager scripts contain 139KB of unused code, slowing LCP by 600ms and wasting processing time.
Optimize Video File Caching
17MB of video content has zero cache lifetime, forcing full re-downloads on every visit and wasting 69MB of bandwidth.
Defer Render-Blocking JavaScript
JavaScript files are blocking initial page render, delaying FCP by 750ms and preventing users from seeing content.
Remove Unused CSS and JavaScript
136KB of unused JavaScript and 63KB of unused CSS waste bandwidth and slow down page parsing.
Frequently Asked Questions
Keep Your Site Fast After Optimization
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