archer

Hello, I have new 2,100 mbp/s internet, confirmed by tech. I have an older win 7 machine, so I upgraded network card to a 2.5g ethernet card (pci xpress x1) and bought new router (Flint2 w/OpenWRT) which has 2x 2.5g ports. Ive worked for days now on this, and even though wifi works fine...

I'm running a OpenVPN server (udp) in my Archer C1200 and I never get more than 8Mbps... Is it normal for this router? Or are there some settings I could tweak? I've seen people on the internet saying they get 80Mbps with this router, or the older C7. I have a 100/100 connection on the server...