Wait, so let me ask which you're asking.
Are you saying you can't get it to run over 60FPS, period, or are you saying you want it to run smoother (more FPS) without speeding the game up?
If it's the latter, you're out of luck. Emulators run the game at 60 FPS, but that's not the internal frame rate. The 60FPS refers to the 60 vblanks (that is, the 60Hz of a television, at least in NTSC). Therefore, the FPS the emulator is reporting it the timing speed of the game. This is why if you speed it up or slow it down, game speed does the same.
The "real" FPS of the game is often lower. Many are often 24 or 30 in alot of instances, and anyone with a picky eye will notice it isn't smooth. There's nothing you can do about this.
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