wireguard/ openvpn / dual core ready for 720p movie ?

Hello, I'm considering using LibreELEC on a dedicated PC, with Wake-on-LAN or Wake-on-WiFi so that I can turn it on remotely when I want? Unless there's a way to turn it on and off or put it to sleep? If I want to use it with my WireGuard or OpenVPN VPN to access my library remotely, does that work well? If I use a dual-core processor, do you think it will handle 720p streaming? Thanks!