LCP
Largest Contentful Paint
19.6s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Fix Element Render Delay Issue
How to optimize mrkooh.cz
Fix Element Render Delay Issue
High Impact+15 points estimated
Why It Matters
LCP element has a massive 1,999ms render delay, indicating JavaScript is blocking critical image rendering.
How to Fix
Move all non-essential JavaScript to load after the LCP image. Add fetchpriority='high' to your product images and ensure they're not waiting for JavaScript to render. Inline critical CSS for product image containers to prevent render blocking. Consider using a resource hint like preload for the LCP image.
0Poor
What This Score Means
A score of 39 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
247ms
Needs Improvement
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 e-commerce site has poor performance with a critically low score of 39/100, indicating serious user experience issues. The biggest problem is extremely slow image loading - your Largest Contentful Paint takes a staggering 19.6 seconds, primarily due to oversized product images that are much larger than needed for their display size and lack proper caching. The site is also bloated with 990 KiB of unused JavaScript from YouTube embeds and Google Analytics, plus 122 KiB of unused CSS that's blocking the initial page render. Optimizing and properly sizing your product images, implementing efficient caching, and removing unused code could dramatically improve your score by 40+ points and provide a much better shopping experience for customers.
Other Optimization Recommendations
Optimize Image Delivery and Caching
High Impact+25 points estimatedWhy It Matters:
Images are poorly optimized (1,432 KiB wasted) and have no cache headers, directly impacting LCP by 900ms.
How to Fix:
Implement responsive images using srcset to serve appropriately sized images (current images are 3x larger than needed). Enable browser caching with Cache-Control headers set to at least 1 year for static images. Compress images further while maintaining quality using tools like ImageOptim or TinyPNG.
Remove Unused JavaScript and CSS
High Impact+20 points estimatedWhy It Matters:
990 KiB of unused JavaScript and 122 KiB of unused CSS are blocking rendering and delaying FCP by 2.1 seconds.
How to Fix:
Audit and remove YouTube embed scripts if videos aren't above-the-fold - consider lazy loading them instead. Remove unused Google Analytics features and consolidate tracking code. Purge unused CSS rules, especially from YouTube player styles (99% unused). Use tree-shaking to eliminate dead code from your JavaScript bundles.
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Related Performance Analyses
More Generic Speed Tests
Generic Performance Resources
Remove Unused JavaScript Code
120 KiB of unused JavaScript increases bundle size and parsing time without providing functionality.
Optimize Image Delivery Strategy
Large, unoptimized images waste 303 KiB and lack proper dimensions causing layout shifts.
Eliminate Render-Blocking Resources
Render-blocking CSS and JavaScript delay LCP by 3.8 seconds, severely impacting page load performance.
Fix Layout Shift Issues
Unsized media elements are causing 0.117 CLS score from images and videos loading without dimensions.