I have since purchased it as well and am also having the same problem. One thing I have found that helps is to set Processor affinity to use only some cores. In my case, cores 0, 1, and 2, but not 3. This limits processor utilization to 75%. I then set priority to High. This seems to help some, but there are still occasional hangs and building preview takes forever.
I'm using version 3.04 Unlicensed Free of VideoPad. A great piece of software I plan to purchase in August. In the meantime I am having some difficulty, however. I have a Phenom II Athlon X4 965 BE @ 3.4GHz but the program shows 100% CPU utilization in Task Manager no matter what I do. Is there an advisable core affinity I should set that might improve performance? I have a fairly robust system with lots of memory and I would not expect the program to be this taxing for my processor. If this is normal, please disregard. If not, any advice from fellow users would be greatly appreciated. Thanks!