In the T901 I wound up mitigating the problems with pretty much the same approach we're taking with the T902. I had other issues with the T901 that made me finally give up on it and upgrade to the T902; mainly that goofy scroll wheel circle on the side of the touchpad. Sharing one PS/2 port's bandwidth between three devices was a terrible idea. For the brush lag, my suspicion is that it's driver based, but I won't really be able to tell unless I can dig into the source. I've run some proc-mon logs over the last few months, and I can see whenever there's even a tiny bump in CPU activity something goes weird. For a while I thought it might have to do with the scratch disk, but with an SSD that seems unlikely. It seems like other processes take priority over photoshop, and it gets backed up a bit while they finish up. I've found the same problems in both windows 7 and 8 (64 bit). I'm back on 7 pro now, although eventually I'll get around to doing a dual boot to try and compare the two. The most aggravating part is that I don't get these same issues in other art programs. I'm ready to switch to painter as my go-to program after all this aggravation.