I have found (the hard way, of course,) that having the Inference tool active while using the Traverse tool causes the application to slow down considerably.
I watched the tasks log in the Diagnostic Monitor, and it appears that when a new segment is added, Pro attempts to generate inferences for every segment of the traverse, one by one. For short traverses, it's negligible. For long traverses, this extra time really starts to add up, to the point that I was waiting whole minutes between entering a new segment and being able to enter the next.
If possible, I'd suggest that the Inference tool somehow be disabled or suppressed when the Traverse tool is active.