LCP
Largest Contentful Paint
15.2s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Optimize and Convert Images to WebP
How to optimize kontextplan.ch
Generic SiteScore: 25/100Analyzed January 2026
Optimize and Convert Images to WebP
High Impact+25 points estimated
Why It Matters
Images waste 1,119 KiB and delay LCP by 1.95 seconds, significantly impacting page load performance.
How to Fix
Convert all JPEG/PNG images to WebP format using tools like Squoosh or ImageOptim for 60-80% size reduction. Implement proper responsive images with correct dimensions - your main image is served at 683x887 but displayed at 340x510. Use picture elements with WebP fallbacks for older browsers. Enable browser caching for images with long cache headers.
0Poor
What This Score Means
A score of 25 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
718ms
Poor
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 severe performance problems with a critically low score of 25/100. The biggest issue is massively oversized and unoptimized images that are wasting over 1,100 KiB of data and causing the Largest Contentful Paint to take a devastating 15.2 seconds - images are being served at twice their display size and in outdated formats instead of modern WebP/AVIF. Additionally, the site loads 565 KiB of unused JavaScript (including a heavy Spline 3D viewer) and has zero cache lifetimes on images, meaning returning visitors get no performance benefit. Fixing image optimization alone could improve load times by nearly 2 seconds and dramatically boost the user experience.
Other Optimization Recommendations
Remove Unused JavaScript and Optimize Loading
High Impact+20 points estimatedWhy It Matters:
578 KiB of unused JavaScript blocks rendering for 3.15 seconds and creates massive main thread work.
How to Fix:
Remove or lazy-load the Spline 3D viewer (382 KiB unused) if not critical above-the-fold. Split your app.js bundle and load only essential code initially. Move Google Analytics to load after page interaction using partytown or similar worker-based solution. Implement code splitting to reduce initial bundle size.
Fix LCP Element Discovery and Preconnect
High Impact+15 points estimatedWhy It Matters:
LCP element isn't discoverable in HTML and missing preconnect hints delay critical resource loading.
How to Fix:
Add fetchpriority='high' to your LCP image element and ensure it's not lazy-loaded. Add preconnect hints to critical origins: <link rel='preconnect' href='https://prod.spline.design'>. Make your hero background image discoverable in initial HTML rather than loaded via JavaScript. Consider inlining critical CSS to reduce render-blocking time.
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Related Performance Analyses
More Generic Speed Tests
Generic Performance Resources
Enable Advanced Browser Caching
Optimizing cache headers ensures consistently fast repeat visits and maintains your excellent performance score.
Implement Critical Resource Preloading
With a perfect performance score, preloading key resources can further optimize LCP for varying network conditions.
Optimize Mobile Viewport Meta Tag
Current viewport configuration causes 300ms tap delays on mobile interactions, directly impacting INP scores.
Add Explicit Image Dimensions
Images without width/height attributes cause layout shifts and poor user experience as they load.
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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