Responsive website and low performance score from mobile devices

Hi, I have a responsive website and I don’t see any problems opening the site from smartphone.
However if I try to verify the score from Page Insight, on mobile it seems horrible respect to desktop.

Desktop:
First Contentful Paint 0,8 s
Speed Index 1,9 s
Largest Contentful Paint 2,5 s
Time to Interactive 2,1 s
Total Blocking Time 140 ms
Cumulative Layout Shift 0

Mobile
First Contentful Paint 4,1 s
Speed Index 8,7 s
Largest Contentful Paint 9,4 s
Time to Interactive 10,0 s
Total Blocking Time 1.060 ms
Cumulative Layout Shift 0

Any suggestions?
Thanks very much