Does anyone Had an issue with Cloudflare CDN conflicting with app my site

I have a cloudflare cdn setup for my website that I’m converting to an app for appmysite, along with a cache plugin I use " Super Page Cache for Cloudflare" Does anyone have CDN Cloudflare having performance issue, the app is very slow, and lagging also crashing when I test it on pysical android and iphone, I don’t have any fancy things on my website it’s just selling 8 products and nothing else, anyone had similar issues, I already contacted support but they are taking so much time.

I also use Cloudflare but not the CDN. I discovered that the loading app speed increased dramatically when I installed plugin " WP REST Cache".