@pjft It's a long changelog, take a look at it. For me, its the proper support for system16 games. Performance? ehhhh. lr-fbaalpha is slower than lr-fba2012 in some games, like the konami ones.

@BuZz I think I sussed it out. I have the Refresh Rate set to 1/1, this gives perfect scrolling but on some SID tunes the sound starts to pop and cut out. If I set the Refresh Rate to Auto then the audio is fine but the scrolling jerks. You must be in jerky scrolling mode. A SID tune that can demonstrate this popping is 'Cauldron', not a great tune but a good example.