LCP
Largest Contentful Paint
2.3s
Good
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Reduce Main Thread Blocking Time
How to optimize tutoriaux.excalibur.com
Reduce Main Thread Blocking Time
High Impact+12 points estimated
Why It Matters
Main thread is blocked for 3.9 seconds with excessive style/layout work preventing user interactions and degrading INP.
How to Fix
Identify and eliminate forced reflows causing 89ms of blocking time. Defer non-critical JavaScript execution using async/defer attributes. Break up long-running tasks into smaller chunks using setTimeout or requestIdleCallback to allow browser breathing room.
0Needs Improvement
What This Score Means
A score of 82 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
1272ms
Poor
Good: < 200ms
Measures how quickly the page responds to user interactions
CLS
Cumulative Layout Shift
0.04
Good
Good: < 0.1
Measures visual stability - how much content shifts during page load
AI Performance Analysis
This website has good performance with a score of 82/100, but there's significant room for improvement. The biggest issue is excessive main-thread work (3.9 seconds) caused primarily by style and layout calculations, which creates a concerning 1,270ms delay for user interactions. The site is also wasting 33KB of unused CSS and has render-blocking stylesheets that delay initial page rendering by nearly 500ms. Cleaning up the CSS, optimizing the layout calculations, and deferring non-critical styles could easily push this site into the 90+ performance range and dramatically improve user responsiveness.
Other Optimization Recommendations
Eliminate Render Blocking CSS
High Impact+8 points estimatedWhy It Matters:
Two CSS files are blocking initial render for 484ms each, delaying both FCP and LCP metrics.
How to Fix:
Inline critical above-the-fold CSS directly in the HTML head section. Load non-critical CSS asynchronously using media='print' onload technique. Split the 51KB CSS bundle into critical and non-critical portions to reduce render blocking time.
Remove Unused CSS Rules
Medium Impact+5 points estimatedWhy It Matters:
33KB of unused CSS (82% waste) increases download time and parsing overhead without providing value.
How to Fix:
Use CSS coverage tools in Chrome DevTools to identify unused rules. Remove unused selectors from the main CSS bundle. Consider CSS tree-shaking tools or manual cleanup of framework CSS that's not being utilized on this page.
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Related Performance Analyses
More Generic Speed Tests
Generic Performance Resources
Eliminate Layout Shifts from Dynamic Content
Layout shifts score of 0.108 creates poor user experience as content jumps during loading.
Fix Critical Render Blocking Resources
CSS and font files are delaying first content paint by 3.6 seconds.
Optimize Large Images and Formats
Images are causing 25.6 second LCP delay and consuming 8MB of unnecessary bandwidth.
Extend Cache Lifetimes
Short cache durations force unnecessary re-downloads on repeat visits, slowing performance.