Moving segments may cause a RC update, because Max triggers a notification indicating that the transformation matrix of the segment have changed.
In some cases that should have not effect in RC, but other it does (i.e. if the Segment's pivot changes).
So, to avoid problems, RailClone rebuilds the object in all cases, when it receives this notification. Futhermore, nested styles require an extra processing, because the inner style must be evaluated as well. That is causing the lag.
A different issue is the change on random. That seems a bug. Does it happen always with a specific RC object, or is random as well ?
If possible, please send us a scene to reproduce it here.