No problems with AC3 here. It does slow down to like 20-25fps but it's still pretty much playable in the cities....not 10fps like you say. Maybe some problem on your end. Try re-installing the game data.mstrchf12

What sort of mindless tech support guy babble is this, reinstalling game data ? There is nothing wrong with our installation and if you haven't experienced the lag, don't be so quick to answer, play further and you'll get to it eventually. It has nothing to do with the game files or the PC/Console specs. My PC meets all requirements. It's poor programming that's causing the lag and if you finish the game without noticing lag, it only proves that you don't know what lag is. FFR Boston lags all the time, no matter what super-computer you own, but framerate really went downhill for me at Sequence 6 Boston mission just as I entered the city.