MIDI input latency over 300ms.
I just upgraded to 3.0, and MIDI input is now painfully slow. When I press a key on the keyboard, there's a delay of almost a second before I hear the note sound. Then I release the key, and there's a similar delay before it stops playing. Worse, there's a separate delay for every note: if I play a chord, they don't all sound together. They get played arpeggiated, with a significant delay between notes.
This is in version 126.96.36.19937 running on macOS 10.13.4, using CoreMIDI for MIDI input.