LCP
Largest Contentful Paint
2.9s
Needs Improvement
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Optimize and Resize Images
How to optimize rstadler.com
Optimize and Resize Images
High Impact+2 points estimated
Why It Matters
Oversized images waste 627 KiB of bandwidth and delay LCP by 450ms with unnecessary data transfer.
How to Fix
Resize hero image to actual display dimensions (665x443 instead of 1600x1067). Implement responsive images using srcset attribute for different screen sizes. Convert images to modern formats like WebP or AVIF for better compression. Use image optimization tools like ImageOptim or online services.
0Good
What This Score Means
A score of 96 falls in the "Good" 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
28ms
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
This website has excellent performance with a score of 96/100, but there's still room for improvement. The biggest issue is poor image caching - your images have no cache lifetime set, wasting over 1MB of data on repeat visits and slowing down your Largest Contentful Paint to 2.9 seconds. Additionally, your images are oversized for their display dimensions, wasting 627KB of bandwidth, and your CSS file is blocking the initial page render. Setting proper cache headers for images and resizing them to match their actual display size would provide the most significant performance boost for returning visitors.
Other Optimization Recommendations
Implement Aggressive Browser Caching
High Impact+3 points estimatedWhy It Matters:
Missing cache headers for 767 KiB of images dramatically impacts LCP by 1.95 seconds on repeat visits.
How to Fix:
Add cache headers to your web server configuration (Apache .htaccess or Nginx conf) with 'Cache-Control: public, max-age=31536000' for images. Set up ETags for cache validation. Configure your CDN or hosting provider to serve static assets with long-term cache headers.
Eliminate Render Blocking CSS
Medium Impact+1 points estimatedWhy It Matters:
The main CSS file blocks initial page rendering and delays First Contentful Paint by 100ms.
How to Fix:
Inline critical above-the-fold CSS directly in the HTML head section. Load remaining CSS asynchronously using media='print' onload="this.media='all'" technique. Split CSS into critical and non-critical parts to reduce the blocking resource from 5.3 KB to essential styles only.
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Related Performance Analyses
More Generic Speed Tests
Generic Performance Resources
Fix Forced Reflow Issues
JavaScript queries of geometric properties after DOM changes cause 47ms of blocking reflow.
Eliminate Unused JavaScript Code
Over 130KB of unused JavaScript delays LCP by 150ms and wastes bandwidth.
Optimize Document Request Latency
Document latency causes 820ms delay affecting both LCP and FCP by 800ms each.
Eliminate Render Blocking CSS
The main CSS file blocks initial page rendering and delays First Contentful Paint by 100ms.