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I have a pi 2 and I was experiencing slow games that had played fine in older versions of recalbox. It was suggested that I disable the rewind feature. I did and now the more demanding games play smoothly. You should try that.
@kaihansen1 no, romset 0.2.97.37 for fba_libretro since Recalbox v3.3.0-b15 https://github.com/recalbox/recalbox-os/wiki/Advanced-Arcade-on-Recalbox-(EN)
Well, there shouldn't be any speed problem with the beta versions either.