There is no “time to load” involved, because all project data is already in RAM (besides static machines streaming from the CF card). Any switching between patterns or parts can be performed instantly by moving some memory pointers around.
Of course, send a bug report! There is bugfix update in the works (well, since more than a year now):
Somewhere in the same thread it got confirmed that the mentioned bugfix update will be even a larger one. So not all hope is lost … 