LCP
Largest Contentful Paint
6.5s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Eliminate Render Blocking Resources
How to optimize stijnvansprang.nl
Eliminate Render Blocking Resources
Medium Impact+12 points estimated
Why It Matters
CSS and JavaScript files block initial page rendering, delaying First Contentful Paint by 450ms.
How to Fix
Inline critical CSS directly in your WordPress theme's header.php file. Defer non-critical CSS using media='print' then switching to 'all' on load. Move jQuery and other scripts to footer or use async/defer attributes in your theme's functions.php.
0Poor
What This Score Means
A score of 20 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
1179ms
Poor
Good: < 200ms
Measures how quickly the page responds to user interactions
CLS
Cumulative Layout Shift
0.33
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 20/100. The biggest problem is massive layout shift (0.329 CLS score) caused by unsized images and web fonts loading, making the page visually unstable as content jumps around during loading. The site is also severely bogged down by a heavy 3D model viewer JavaScript library that blocks the main thread for over 41 seconds and contains 88KB of unused code. Fixing the image sizing issues, optimizing or removing the 3D model viewer, and cleaning up the 63KB of unused CSS could dramatically improve both the user experience and Core Web Vitals scores.
Other Optimization Recommendations
Fix Layout Shifts from Fonts
High Impact+25 points estimatedWhy It Matters:
Layout shifts of 0.329 severely hurt user experience and CLS scores, primarily caused by web font loading.
How to Fix:
Add font-display: swap to all custom fonts in your CSS. Preload critical fonts using <link rel='preload'> tags in WordPress header. Use font metric overrides or size-adjust CSS to match fallback fonts and prevent shifts during loading.
Reduce Unused JavaScript Execution
High Impact+30 points estimatedWhy It Matters:
3.5 seconds of JavaScript execution time blocks the main thread and causes 17.97 second Total Blocking Time.
How to Fix:
Remove or defer the large model-viewer.min.js library (245KB) that has 36% unused code. Use code splitting to load only necessary parts. Consider replacing with a lighter 3D viewer or loading it only when the model is interacted with.
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WordPress Performance Resources
Remove Unused Divi CSS and JavaScript
52KB of unused CSS and 74KB of unused JavaScript increase page weight and slow down parsing without providing value.
Compress and Resize Hero Image
The header logo is 51KB larger than needed and wastes bandwidth while potentially delaying LCP.
Optimize Web Font Loading Strategy
Web fonts cause significant layout shifts (CLS: 0.139) and delay content rendering, directly impacting user experience.
Remove Unused Divi CSS/JavaScript
84% of your CSS (52KB) and 66% of Divi JavaScript (74KB) is unused, slowing down page load times.