Messages delay

So, I am using simplex with my own hosted server. When i open the app and send a message there is a pretty long delay for the first msg like 30s. After that it is instant. I tried disabling battery optimazation but nothing seems to fix it. I thought maybe the wireguard tunnel is getting inactive but after setting the keepalive to 2s the same problem.

I am currently using the 6.5.1 version, and I reach the wg server with rethinkdns-> wg proxy.

If I go out of the app for like 2 minutes and go back again the first msg is 30s to send.

Is there a way of fixing it? Or is it designed to work like this?