Planetside 2 was horrendously single-threaded, so anything but recent Intel chips would leave you with really bad performance in large battles. I would often max out my AMD CPU (well, one core of it) at around 12 FPS without my graphics card breaking a sweat in 100-200 player battles.

PS2 was for the most part an amazing game. The graphics were truly beautiful and the gameplay was very fun. Unfortunately, their shitty performance basically killed the game by making it unplayable for many users during the trademark huge battles.