Hi, Playbeat’s core engine is sequencer-based rather than MIDI-based. Because of this, MIDI import was not originally a core feature but was later added for basic timing imports at the request of users.
At the moment, we’re not actively focusing on optimizing the MIDI import function, although we do have some timing improvements planned. As with all our development, we prioritize features based on user feedback, so if more users request this, we’ll try and make it happen.