Same here.
My System is a Raspy 3 running Recalbox 9. Since the update from 8 to 9 none of the C64 Roms ist running properly.
Most of them don´t start anymore. The few ones starting, have a cracked sound and are running slowed down.
I changed the Emulator in the configuration menu several times, the problems stay the same.
All other systems are running properly.