Hello,

1. With the enabled “Separate cache for mobile devices” in WP Rocket, I suggest using our “Mobile DOM optimization (experimental)” option in Theme Settings -> Performance -> Other: https://prnt.sc/ekkTPAyfWeGZ

2. Avoid an excessive DOM size:

The number of DOM elements are generated in the process of content building. All page builder elements are DOM elements. If you want to reduce DOM elements you will have to reduce the content: widgets, products, menu items, and others.

3. – Eliminate render-blocking resources – you may try solutions described here https://onlinemediamasters.com/eliminate-render-blocking-resources-wordpress/

Kind Regards