The second thing to bring up is the design of the game itself. In a first person shooter, your input is generally linked to the frame rate of the game. If the frame rate drops below 30 FPS, things can get choppy, and many even consider 60 FPS to be the minimum desired frame rate. Other types of games may not be so demandingstrategy games like Civilization V and the Total War series for instance can be played even with frame rates in the teens. One of the reasons for that is that in those two titles, mouse updates happen at the screen refresh rate (typically 60 FPS), so you dont feel like the mouse cursor is constantly lagging behind your input. We wouldnt necessarily recommend <20 FPS as enjoyable for such games, but it can be tolerable. Diablo III takes a similar approach, and as a game played from a top-down isometric viewpoint, 30 FPS certainly isnt required; I have personally played through entire sections at frame rates in the low to mid teens (in the course of testing for this article), so it can be done. Is it enjoyable, though? Thats a different matter; Id say 30 FPS is still the desirable minimum, and 20 FPS is the bare minimum you need in order to not feel like the game is laggy. Certain parts of the game (e.g. interacting with your inventory) also feel substantially worse at lower frame rates.