If you control your OpenVPN server and the OpenVPN client and your GL-iNet device supports it, you could attempt “cipher CHACHA20-POLY1305” on both sides given you use TCP and possibly see OpenVPN speeds increase a bit. Using CHACHA vs AES will help lower power devices as CHACHA is slightly less heavy.
It’s the same cipher wireguard uses, so if that’s fine for wireguard, why wouldn’t it be for OpenVPN.
It still will not give you wireguard’s speeds, but I did see significant increases in speed that way.
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