None at this moment. Mikrotik’s OVPN implementation sucks for RouterOS ver 6.x:
- Support only for TCP not UDP (Causing TCP meltdown)
- No compression
- No hardware acceleration for encryption/ decryption.
RouterOS v7.x that is in beta since last year promises to fix these issues. I do know it supports at least UDP now but not sure the others features.
If you want good performance now I recommend to use IKEV2 VPNs with some of the routers that supports IPSec HW acceleration such as hEX S, hAP AC2 or RB4011 just to mention few.
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