Hi, based on what you said I have an idea on a fix and it was something I was plan on doing anyways. Basically right now HM does not move HH files until the session is over but this means that he files gets bigger and bigger so for long sessions it could cause issues for some people. It seems that is what is happening here although there is probably something else triggering it since it isn't really happening to other people.

So the solution is to probably move the hand history files more frequently. As a test can you try this - after every 30 - 45 minutes or when you start to get a bit of lag just move all the files in C:\Program Files\Full Tilt Poker\HandHistory to a backup folder somewhere and see if that instantly makes performance better

Roy