With Logic Pro X 10.2.0 and MainStage 3.2.2, as soon as I play my first note on my A-88 keyboard, the MIDIServer process jumps to about 40% usage of the CPU and stays there. Turning off the keyboard returns the MIDIServer process to 0.1% usage. When I play my other keyboards, the MIDIServer process stays around 0.1%.
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