I was reading that thread. I didn't quite finish though. And, yes, I am seeing GUI slowdowns. Not so much jerky mouse movements. Though that's quite possible but I'm not noticing anything to be enough of a bother. I'm curious why this would show up in 10.5.2 and not in any of the other versions (not saying it wasn't in 10.5.1 but i certainly didn't notice it as I'm noticing it now).