Demonstration of the different speeds available to focus via software with an Canon EF lens using the PROP_LV_FOCUS property message. Speeds up to about 40 are fairly smooth. Lens is an 85 mm f/1.8 and the programmed focus range is 0.85 cm to 2.8 m.
More information about the firmware: magiclantern.wikia.com/
Technical information about the focus commands: magiclantern.wikia.com/wiki/Focus