Wow, that's about twice the speed (half the time, if you prefer)! Good thing you came up with the optimization when the game was still in a private beta phase, so it'll impact relatively few users.
I agree it was good that few people were impacted! Those people already have the tools and information to correct their save, and I didn't need to send out the save modifying program to someone who wasn't already gonna use it to test. Speaking of sending stuff, I just sent out this beta to all current testers.