A little tip that may or may not be of use to people here, but I recently figured out that turning off Spotlight during a large import speeds up the import process by a fairly good amount. What I was doing was creating a library on a new external HD then importing the pre-existing images from another internal drive using LR's date-based system. With Spotlight on, the files were taking forever to load in and any click within the program caused a long delay with the spinning beachball. Hope this helps anyone new to LR facing this sort of issue.
Nice tip. Now, how do I turn off Spotlight on my mac?