Sure—I agree that it’s a Motion problem, just wanted to address your statement:
Or arcs involving the Z.
Because that felt misleading, as I am certainly doing effectively arc motion just fine 
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Yes, but providing Grbl with the actual arcs and allowing it to do movement planning should allow for better planning and smoother and faster movement.
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You are right Will! looking forward to the fix.
@WillAdams Actually, GRBL does a better job of planning if it doesn’t have to compute the segments, then the issue is just keeping the buffer full. In a pet project of mine (a new sender), I can input g-code with arcs and splines and it does the interpolation the same way grbl would and the machine seems very happy.
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So you pre-convert the arcs in the sender? Does that happen when your load the file or on the fly?
What kind of improvement in planning do you see?
When are we going to see this sender?
@neilferreri the sender has options per curve type that can be enabled to interpolate or send as is in the file. This way this sender can be used to support higher level g-code on multiple motion controllers.