LCP
Largest Contentful Paint
9.8s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Remove Unused JavaScript and CSS
How to optimize porthcawlmarine.co.uk
Shopify SiteScore: 54/100Analyzed January 2026
Remove Unused JavaScript and CSS
Medium Impact+12 points estimated
Why It Matters
337KB of unused JavaScript and 37KB of unused CSS are wasting bandwidth and blocking the main thread for 2 seconds.
How to Fix
Use Shopify's Script Tag API to conditionally load the chat widget only when needed. Remove unused CSS from your theme's styles.css file using coverage analysis. Defer Google Analytics and tracking scripts using Shopify's Customer Privacy API to load after user consent.
0Needs Improvement
What This Score Means
A score of 54 falls in the "Needs Improvement" 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
284ms
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 Shopify site has poor performance with a score of 54/100, indicating significant issues that need immediate attention. The biggest problem is an enormous network payload of nearly 12MB, primarily caused by a large HD video file (5.3MB) that's loading immediately when the page opens. Additionally, render-blocking CSS files are delaying the initial paint by 110ms, and oversized images are wasting 800KB of bandwidth. The site takes 19 seconds to become fully interactive, which will frustrate users and hurt conversions - optimizing the video delivery, compressing images, and deferring non-critical CSS could easily improve the performance score by 20+ points.
Other Optimization Recommendations
Optimize Large Video and Images
High Impact+25 points estimatedWhy It Matters:
A 5.3MB video and oversized images are causing your 12MB page payload, severely impacting LCP (9.8s) and load performance.
How to Fix:
Replace the hero video with a compressed version or poster image using Shopify's image optimization. Resize product images to match display dimensions (317x317 vs 832x832). Enable Shopify's automatic image compression and use responsive image sizing with proper srcset attributes.
Eliminate Render Blocking Resources
High Impact+15 points estimatedWhy It Matters:
CSS files are blocking initial page render, delaying both FCP and LCP by 100ms each.
How to Fix:
In your Shopify theme's theme.liquid file, add 'media="print" onload="this.media='all'"' to non-critical CSS links to make them non-blocking. Inline critical above-the-fold CSS directly in the HTML head. Move the portable-wallets CSS to load after page interactive.
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Related Performance Analyses
More Shopify Speed Tests
Shopify Performance Resources
Add LCP Image Priority Hint
The LCP hero image lacks fetchpriority='high', missing an opportunity to load the most important visual element faster.
Eliminate Render Blocking Resources
CSS files are blocking first paint by 450ms, delaying when users see content and hurting Core Web Vitals scores.
Optimize Product Image Delivery
Large unoptimized images waste 5.6MB and significantly impact loading performance with poor compression and oversized dimensions.
Optimize Image Delivery Performance
Images are 788KB larger than needed and delay LCP by 600ms due to oversized files and poor compression.
Frequently Asked Questions
Keep Your Site Fast After Optimization
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