LCP
Largest Contentful Paint
7.5s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Fix Unsized Images Causing Layout Shifts
How to optimize stijnvansprang.nl
Fix Unsized Images Causing Layout Shifts
High Impact+35 points estimated
Why It Matters
Unsized images are causing a severe CLS score of 0.479, creating jarring layout shifts as content loads.
How to Fix
Add explicit width and height attributes to your logo image and content images. In WordPress admin, ensure all images have proper dimensions set. For the lazy-loaded images, configure your Smush plugin to include proper aspect ratio placeholders to prevent layout shifts.
0Poor
What This Score Means
A score of 13 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
1197ms
Poor
Good: < 200ms
Measures how quickly the page responds to user interactions
CLS
Cumulative Layout Shift
0.48
Poor
Good: < 0.1
Measures visual stability - how much content shifts during page load
AI Performance Analysis
This WordPress site has severe performance issues with a critically low score of 13/100. The biggest problem is massive layout shifts caused by unsized images, particularly the logo and project photos, which creates a jarring user experience as elements jump around while loading. Combined with an extremely slow 3D model viewer JavaScript library that takes over 3 seconds to execute and blocks the main thread, the site takes 13+ seconds to become interactive. Fixing image dimensions to prevent layout shifts and optimizing or deferring the heavy model-viewer script could dramatically improve the score by 40+ points and provide users with a much smoother, faster experience.
Other Optimization Recommendations
Optimize Model Viewer JavaScript Performance
High Impact+25 points estimatedWhy It Matters:
The 245KB model-viewer.min.js library is blocking the main thread for 3+ seconds and causing 90KB of unused JavaScript.
How to Fix:
Lazy load the 3D model viewer only when needed using intersection observer. Consider switching to a lighter 3D library or compress the existing GLB model file. Move the model-viewer script to load after critical content renders.
Implement Font Display Optimization
Medium Impact+10 points estimatedWhy It Matters:
Custom fonts are causing 70ms delays and invisible text during font loading, impacting FCP by 50ms.
How to Fix:
Add 'font-display: swap' to your CSS for Ysabeau Office and other custom fonts in your WordPress theme. Use font metric overrides in your CSS to minimize layout shifts. Consider preloading critical fonts in your theme's functions.php with wp_enqueue_style and preload link tags.
Keep Your Site Fast After Optimization
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More WordPress Speed Tests
WordPress Performance Resources
Extend Cache Lifetimes for Assets
Short cache durations force unnecessary re-downloads on repeat visits, slowing LCP by 150ms.
Convert Images to Modern Formats
Your profile image wastes 85KB which could be reduced by 30-50% with modern formats.
Eliminate Render Blocking CSS
Your main stylesheet blocks initial page render, delaying both FCP and LCP by 150ms.
Remove Unused CSS and JavaScript
93% of CSS (37 KiB) and 323 KiB of JavaScript are unused, wasting bandwidth and slowing page load.