SpeedX
Mobile and desktop scores, Core Web Vitals and the changes that would help most..
What the numbers mean
Largest Contentful Paint
When the main content appears. Good: under 2.5 seconds.
Total Blocking Time
How long scripts keep the page from responding. Good: under 200 ms.
Cumulative Layout Shift
How much the page jumps while loading. Good: under 0.1.