They had to increase the game time simulation and the engine simulation to match the 60fps bump. This is one of the problems that occurred when modders tried fixing Need for Speed Rival's 30fps hard-lock on PC when they tried speeding up to 60fps. In result, you have games that play like they're in fast-forward mode. It's literally taking the entire game simulation and just doubling or tripling the speed while the engine parameters are still set at the original speeds. A lot of times it's possible to get games to run at 120fps, but there's a major issue of the sound, controls and actual game mechanics being sped up as well. Mixed with the enhancements in Dolphin, ehw modified Super Mario Sunshine to run at 60 FPS without doubling the speed of the game!”
“While an emulator can't do much on its own to increase the framerate of a game, one of our users, ehw, believed that it would be possible to modify the game to run at a higher framerate.
