The Good News:
Surfacing toolpath processing is significantly faster and more robust!
The Bad News:
Solid Verify is still way too slow when loading .stl files.
Solid Verify is very buggy often causing Mastercam X3 MU1 to crash.
You still can’t renumber tools properly.
It’s been reported that X3 MU1 will not Backplot or Verify toolpaths where Transform / Mirror is used. While I have not tried this yet in X3 MU1, CNC Software says it’s a problem and is on the list to be fixed for X4 with the implication that it won’t be fixed at all in X3.
Conclusion:
Mastercam X3 MU1 still has major graphics issues that hurt the product very badly.