"I am not sure why you are seeing a 2 sec lag. I do have the FBV MKII and switching between any of the presets A, B, C, D are instantaneous. Even going between Banks is fast once you select it. It sounds to me like you have another issue."
Hi sdzimmerman!
Line6 confirmed it in this thread on my open ticket! I believe even the amplifi FX100 is experiencing it also.