I think that mp3 plays via CPU, but .ogg via SBL!
No, there are technically the same, just without patents.
Maybe. I don't know. But the same ScummVM, the same game and:
Track1.fla (or .flac) - no sound, game goes fluently
Track1.mp3 - sound, during playing sound game 'freezes'
Track1.ogg - sound, game goes fluently
AmigaOS: Pegasos II, Sam440ep-flex, Micro A1-C, AmigaOneX1000
MorphOS: Pegasos II, Powerbook G4, iMac G5, Powermac G5 Quad