LCP
Largest Contentful Paint
1.6s
Good
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Add Explicit Image Dimensions
How to optimize herzenshund.martens.zentrum.de
Generic SiteScore: 77/100Analyzed February 2026
Add Explicit Image Dimensions
High Impact+15 points estimated
Why It Matters
Missing image dimensions cause 0.611 CLS score due to layout shifts as images load.
How to Fix
Add width and height attributes to all img elements: Sandra.webp (width='169' height='300'), Siegel.webp (width='332' height='288'), and logo.webp (width='60' height='60'). Set CSS to maintain responsive behavior with max-width: 100% and height: auto.
0Needs Improvement
What This Score Means
A score of 77 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
19ms
Good
Good: < 200ms
Measures how quickly the page responds to user interactions
CLS
Cumulative Layout Shift
0.61
Poor
Good: < 0.1
Measures visual stability - how much content shifts during page load
AI Performance Analysis
This website has moderate performance issues with a score of 77/100, but suffers from significant layout stability problems. The biggest issue is that images lack proper width and height attributes, causing a poor Cumulative Layout Shift score of 0.611 (well above Google's recommended 0.1 threshold) as content jumps around while images load. The site could save an estimated 127 KiB by implementing proper caching for images, and another 67 KiB by compressing images more efficiently, which would improve loading speed by nearly a second. To fix these issues, add explicit dimensions to all images and enable browser caching to prevent repeat downloads on return visits.
Other Optimization Recommendations
Implement Efficient Image Caching
High Impact+12 points estimatedWhy It Matters:
Images lack cache headers, causing 127 KiB of wasted bytes and 900ms LCP delay on repeat visits.
How to Fix:
Configure your web server to add Cache-Control headers for images with max-age=31536000 (1 year). Add .htaccess rules for Apache or nginx configuration for static assets. Implement cache busting with version parameters when images change.
Compress and Optimize Images
Medium Impact+8 points estimatedWhy It Matters:
Over-compressed images waste 67 KiB bandwidth and delay LCP by 450ms.
How to Fix:
Re-compress Sandra.webp to reduce 58 KiB and Siegel.webp to save 10 KiB using tools like ImageOptim or online WebP compressors. Maintain quality around 80-85% for photos. Add fetchpriority='high' attribute to the LCP image element.
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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
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