I’ve got a new Raspberry Pi 2, with RetroPie 3.0 beta from SD card image, and all of the emulators and roms that I’ve tested just worked beautifully, except one: Nintendo 64 games. They are unplayable: very slow and the sound keep stuttering like crazy. I’ve been seeing at the internet people performing n64 games on RPi’s 2 perfectly, so I know it’s possible.
I set the overclocking to “Pi2”, and tried to change the video settings but I didn’t see any difference.
Press x or m as the ROM loads and you can change the default emulator. Or in the experimental menu from the retropie setup script you can install mupen64plus testing which seems to have better configs for running games but it will still be hit and miss.