Problem with working

[limanskygg]

Hi, guys. I speak English poorly, but I hope you understand me. 

Recently I downloaded JKG, but the mod wildly lags (my computer is powerful). I don't know why. I use non-Steam version and OpenJK. Have you answer to this? 

I just cannot play. The mouse cursor is in a different place after a few seconds, as soon as I move it.

[Futuza]

As I mentioned in the PM you sent me, have you tested it with just OpenJK to see if the same thing occurs when using OpenJK?  This will help me narrow it down to whether this is a specific JKG issue or an issue with OpenJK/your hardware.