Speed Issues - eddywebs/RetroPie-Setup GitHub Wiki
From ToadKing:
BTW, for most of those cores you should be able to get at or near full speed, with some exceptions:
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imame4all: Speed depends on the game. Certain Midway games are known for being really slow, like Mortal Kombat or NBA Jam.
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pocketsnes: Some games, especially SuperFX and SA-1 games, will be kinda slow on a stock speed Pi. Some graphic effects in other games can lag specific screens. I overclocked/overvolted my Pi to 950 Mhz and it runs most games at full speed, except for the SuperFX and SA-1 ones.
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vba-next: Will probably never be fullspeed on the Pi. An alternative port is being considered.
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genesis-plus-gx: Is still a bit too slow on the Pi. An alternative port is being considered.
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mupen64plus: Due to limited processing power some games will never be fullspeed on the Pi2.
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reicast: Due to limited processing power some games will never be fullspeed on the Pi2.
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ppsspp: Due to limited processing power some games will never be fullspeed on the Pi2.
General Improvement in retroach
set video_threaded = true in retroarch.cfg will improve video performance
Overclocking Thread of the Official RPi Forum
There is a thread about overclocking the RPi in the official forum of the foundation. You can find it here.
Overclocking With RetroPie Setup
In the menu "Setup" you can find the options for changing the ARM and SDRAM frequencies. Note that changes will take effect after a reboot of the Raspberry.
Overclocking With raspi-config
You can overclock your Raspberry without voiding its warranty with the official raspi-config script. It can be started with
sudo raspi-config
User Comments
From ChadP:
Im running my pi at over_voltage=6. arm_freq=1000. core_freq=500. sdram_freq=500. and the games are fast no lag.
I think that these are options for a heavily overclocked RPi and I would suggest to use a heat sink (at least!)