In the H9 when you switch from one algorithm to another, there is still some loading time but it's less than what you experience with the the Factor pedals because the H9 is using a faster chip.  We've seen loading times on the H9 ranging from 150 – 333 msecs depending on what algorithm is being loaded and what needs to be done to set up its memory and so on.  If you really want zero latency, the only way you can do that is to double up all the system resources so you can have two algorithms pre-loaded, and although we might at some point make a stompbox with more available system resources, the only way to do this now is to get multiple stompboxes.

Within an algorithm though there are lots of ways though to switch from one set of values to another without any loading time.  You can assign different parameter values to the expression pedal and glide between the two sets of values, and in the Space algorithms you can use the hot switch functionality to toggle between two preset specific different sets of parameter values.  You can use MIDI to load any number of different sets of parameter values, and you can globally assign different parameter values to the aux switch and toggle between them regardless of what preset is loaded.