I've found that most of the lag seems to be directly related to the amount of memory used by the iExplorer 'game' session.
It seems that a LOT of the 'trashcan' memory misuse has been corrected, BUT if I switch between practice and Invite BPB and others, it seems that the memory is not released.
I just keep Task Mangler running and check on how much memory is being used. Any time it's close to 1/2 gig, I kill the 'game' window and restart.
I'm running w/ 2gig but still can see my harddrive cache when memory is being paged in and out.
It helps me (not a Total solution) to watch Task Manager. Even if it's doing nothing, I feel like I'm a little more in control...:)
Besides, if it didn't jerk every once in a while, what excuse would I have for those crappy shots..:)