LCP
Largest Contentful Paint
10.0s
Poor
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Fix Layout Shifts from Images
How to optimize billetterie.madparis.fr
Fix Layout Shifts from Images
High Impact+15 points estimated
Why It Matters
Unsized images cause a 0.401 CLS score as content jumps when images load.
How to Fix
Add explicit width and height attributes to all images, especially the footer logo and card images. Set dimensions that match the actual display size (e.g., width='383' height='383' for card images). Use CSS aspect-ratio property as backup for responsive behavior.
0Poor
What This Score Means
A score of 41 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
52ms
Good
Good: < 200ms
Measures how quickly the page responds to user interactions
CLS
Cumulative Layout Shift
0.40
Poor
Good: < 0.1
Measures visual stability - how much content shifts during page load
AI Performance Analysis
This website has poor performance with a score of 41/100, primarily due to severe layout shifts and slow loading times. The biggest problem is a massive layout shift (CLS score of 0.401) caused by images without proper dimensions, which makes the page jump around as it loads and creates a frustrating user experience. Additionally, the site takes over 10 seconds to fully load its main content, with render-blocking CSS files delaying the initial page display by 2.2 seconds. Fixing image dimensions, optimizing the large image files (which could save over 4MB), and reducing unused CSS/JavaScript could improve the score by 30+ points and dramatically enhance user experience.
Other Optimization Recommendations
Optimize LCP Image Discovery
High Impact+25 points estimatedWhy It Matters:
Your LCP image is lazy-loaded and takes 10 seconds to load, severely impacting user experience.
How to Fix:
Remove the loading='lazy' attribute from the main hero image (/medias/etablissement_1/programmation/BILLETCOLLECTIONS_NHEjOud.jpg). Add fetchpriority='high' to prioritize its loading. Use a <link rel='preload'> tag in the <head> to start loading this critical image immediately.
Eliminate Render-Blocking CSS
High Impact+18 points estimatedWhy It Matters:
3 CSS files block page rendering for 2.2 seconds, delaying First Contentful Paint.
How to Fix:
Inline critical CSS for above-the-fold content directly in the HTML. Use media='print' onload="this.media='all'" to defer non-critical CSS like bootstrap.min.css and nucleo-icons.css. Minify soft-ui-dashboard.css to reduce its 126KB size by 25%.
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Related Performance Analyses
More Generic Speed Tests
Generic Performance Resources
Eliminate Render-Blocking CSS
3 CSS files block page rendering for 2.2 seconds, delaying First Contentful Paint.
Optimize LCP Image Discovery
Your LCP image is lazy-loaded and takes 10 seconds to load, severely impacting user experience.
Remove Unused JavaScript Code
Over 53% of your main JavaScript bundle (57KB) is unused, wasting 300ms of load time and impacting LCP.
Optimize Font Display Strategy
Custom fonts are blocking text rendering for 450ms, delaying First Contentful Paint and creating invisible text periods.