Output speed is slow
When mp4 video is been created, the speed is slow and CPU usage is low.
Is it possible to use CPU more and make it faster?
Go click [File]->[Options]->[Advance Setting] and see if "Enable for video output" in [Built in codec] is ticked.
If not ticked, please tick it and try to make MP4 videos.
Also, if your PC is one of Intel Processor Family Core i3, i5, or i7, you can try an additional option to
use Intel Quick Sync Video technology when you write it to DVD.