In tunnel mode, without proxying functions

[lootoos]

Describe the feature request
Is it possible to enable frp in tunnel mode without proxy functions?
I make a tunnel through wireguard, I send packets to it using iptables -t nat -A PREROUTING -i ens3 -p tcp --dport 25565 -j DNAT --to 10.228.228.2:25565, so I keep the normal IP addresses of the players and also have UDP/TCP support
But I tested such an implementation for downloading files, a file weighing 7GB is transmitted at a speed of 2MB/S, if you transfer the file via nginx then the speed is 2.5MB/S

Describe alternatives you've considered
Wireguard :"considered but not sure if it has the lowest ping", tunnel Proxied via nginx.