Loading Data problem using DNS/Reverse Proxy

I have a bit of a problem using my own domain. It often loads very long. Sometimes it’s fast over my domain, but sometimes it only loads if I refresh the page.

My setup is:

  • Domain
  • Cloudflare DDNS proxied
  • Server 1 Reverse-Proxy (nginx)
  • Server 2 Home Assistant

The reverse proxy does have Websocket support enabled (as suggested by another thread). SSL is also enabled.

The internet connection isnt the issue because my other sites load pretty fast and dont have such bugs.

Any suggestions?