Big problem with win8 and openvpn 2.3

kilk

Hello, sorry for my poor english
could you please help with one problem
i downloaded openvpn 2.3 and tried connect but getting error
high cpu usage and IO usage, seems send a lot of udp pakets
here screenshot
https://dl.dropboxusercontent.com/u/14746859/Screenshot%20%2815%29.png

kilk

could you please say how i can run openvpn to use
Socket Buffers: R=[8192->8192] S=[8192->8192]

now on win 8
Socket Buffers: R=[65536->65536] S=[65536->65536]