Just to clarify the settings says:
"Rapid Movement Speed for when the machine is not printing. This should match your actual z-axis movement speed between layers when printing, for accurate printing times."
It's set to 30mm/sec right now.
So it appears it controls both the non-printing rapid movement speed on Z, and also is used to determine accurate print estimation times in the preview.
My SD3: Clear plexiglass case, case heater, X axis stabilizer, Z axis stabilizer, thumb screws, filament guide, heatsinks on all motors, extruder fan, controller fan, heatsinks on motherboard, Y rod pillow block, USB and Power on/off switch, fully calibrated including trimpot tuning. Am I missing anything?