The track panel resizing being slow -- ok, that's a specific case -- the main arrange view editing (e.g. drawing automation or pencil drawing a new MIDI item, etc) should still be relatively fast in that case, though, right?
As far as the MIDI editor slowness (edit): aha, yes, it does slow down if *all contexts are editable*. Being visible is fine, but drawing CCs into a lane with all contexts editable, is indeed slow(er).
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