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Are you seeing a rainbow coloured square in the top right corner of the screen whilst playing? If so then you are having power issues, i.e. your Pi is not getting the power it needs to perform from your power supply.

I use and recommend minimum (genuine) 2amp power supply. I had slowdowns with SNES, MAME, PSX etc. when I had a bad quality PSU (it was marked as 2amp but performed worse than a 1amp spare I had!). Swapping it out to a genuine 2amp psu instantly solved all my problems and all 23 systems run pretty perfect now.