Just for the info guys, the performance downgrade happened in this commit, https://github.com/dborth/snes9x-gx/commit/f65c3d01c3a94d02781dbdaad8c7f1bf15cd6f61 It has to do with the "use timers for sync only" change. I added the old vsync method back to the latest source and it fixed the audio popping. However, Final Fantasy VI and Chrono Trigger still freeze in battles. Does anyone know the reason for this? I know these games worked at one point in time.