PageSpeed Insights

Hi, Fruitful Team

I have a question.
If I want a theme with the loading speed of more than 90%+++
What do I have to do?

Mobile : 75/100 Speed
Desktop : 84/100 Speed

Please see the link :
https://developers.google.com/speed/pagespeed/insights/?url=http%3A%2F%2Fthemes.fruitfulcode.com%2Ffruitful%2F&tab=mobile

You can customize it to better it ?

Thank you very much.
Bird