UMotion Pro has a significant impact on code compile times, slowing down projects unnecessarily. Even without opening UMotion, simply having UMotion added to the project causes this slowdown. You can verify that UMotion is doing this crazy amount of work on every compilation by looking at in the Unity Profiler, setting it to profile Edit Mode in the top left and enabling Deep Profiling.
Something needs to be done to make it so UMotion doesn't load all this stuff in the background when it's not being used. At least not until you boot it for the first time. The AnimatedFloatClipLayer.OnAfterDeserialize() is the biggest killer, and if that could at least be gotten rid of, it would be a huge win.
Customer support service by UserEcho