LCP
Largest Contentful Paint
4.8s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Optimize Images for Modern Formats
How to optimize dev01.chrisjahn.de
Generic SiteScore: 78/100Analyzed January 2026
Optimize Images for Modern Formats
High Impact+12 points estimated
Why It Matters
Image optimization can save 782 KiB and improve LCP by 700ms, directly addressing your largest performance bottleneck.
How to Fix
Convert PNG images to WebP format which provides 30-50% better compression. Implement responsive images using srcset with proper sizing (current images are 2-4x larger than displayed). Add fetchpriority='high' to your LCP background image element.
0Needs Improvement
What This Score Means
A score of 78 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
22ms
Good
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
Your website has below-average performance with a score of 78/100, but there are significant opportunities for improvement. The biggest issue is your Largest Contentful Paint (LCP) taking 4.8 seconds, which is primarily caused by render-blocking CSS files that are delaying page rendering by an estimated 1.38 seconds. Your site is also loaded down with large video files totaling nearly 12MB, and several images that could be optimized by converting to modern formats like WebP and properly sizing them for their display dimensions. Fixing the render-blocking resources and optimizing your images could easily push your performance score above 90 and dramatically improve user experience.
Other Optimization Recommendations
Eliminate Render Blocking CSS
High Impact+8 points estimatedWhy It Matters:
Three CSS files block initial render for 1,380ms, significantly delaying First Contentful Paint.
How to Fix:
Inline critical CSS for above-the-fold content directly in the HTML head. Load non-critical CSS files asynchronously using media='print' onload='this.media="all"' technique. Consider combining the three separate CSS files into one optimized bundle.
Optimize Font Loading Strategy
Medium Impact+5 points estimatedWhy It Matters:
Font files in the critical chain delay LCP by extending the longest network dependency to 811ms.
How to Fix:
Add font-display: swap to @font-face declarations to prevent invisible text. Preload the most critical font variant using <link rel='preload' as='font' crossorigin>. Consider using a system font stack as fallback to reduce layout shift.
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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
Once your site is optimized, maintain that speed. Use DeployHQ for zero-downtime, automated deployments—so performance fixes and updates go live safely every time, without breaking your site.
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