Using ASIO with tracks frozen or unfrozen mine still takes 4sec to start play by double click chord or spacebar or play button, it takes near as long as Generate/Play button, looking up on the very top left of the window "Generating arrangement... please wait" each time it tries to play.

If it's playing from RAM it should be instant, there should not be any generating going on.

Even with all midi tracks it's the same.

The Mac version of BB is instant !

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