Help: Cleaning Unused CSS for faster website first render

[voltatek]

Hello,

My prestashop store is slow. Google Lighthouse says that I need to remove unused CSS. The CSS files are too big to load.

I am running prestashop 1.7 with a custom theme. CCC option is activated and CSS files are minified.

I tried to open the theme's css file but it doesn't contain every styles the page need, maybe an other css file from prestashop core?

Does somebody have a solution to clean the CSS on Prestashop 1.7 ?

 

Thank you!