I have run through the disk permissions utility instructions, as well as the repair utility in the Starcraft II folder. After they both ran the start-of-game lag/extremely low FPS issue was resolved... for one day. (It came back the next day.) Maybe it's caching something - I don't know and I don't care. What I do know is that *none* of these problems existed before the v1.4.x patches.
I'm about to ditch the game because this. If it were any other game I would have already walked away. One customer may not mean much to you people, but how many others don't bother posting something before they walk away? Knowing that the problem is *directly* attributable to a "patch" rather than some mysterious system issue is just salt in the would. Fix it.