Ever since I upgraded to Win10 I experience the same issue. I heard, the only work around atm is to run a virtual machine of windows XP. You might want to do that if your interested. It will smooth everything out if you run the game that way.
And to be honest I have been running the game the lazy way with Win10 and dealing with the lag, because setting up a VM intimidates me. So, let me know if you’re interested and we’ll take the supportive steps together to run it in VM.