Do you still think that CPU is the problem???
No, I just wanted you to see which other programs were using up CPU cycles in case there was another program(s) on the PC that were causing the slowdown. But if total CPU useage on the home PC while that program is running is only 11% it's some other issue and probably not memory since you have a fair bit.

Do you have another drive to save the image to while it's being recorded? I'd try that next if possible.
Also, although I'm not familiar with those programs are they both (on both PC's) set up with the same parameters? I'm wondering if the home PC is saving a video with a much higher bitrate (requiring more work to be done)