I had a topic going on the FM forums and even sent in my solution for review to FM at their request and never really heard back anything solid.
Basically FMGo 14 on iPad Air2 is slower and clunkier than FMGo 13 on iPad2 when changing layouts. The suggestion, I think, was that this could be fixed with forcing the size(zoom) for the layouts before switching, but that did not really fix the issue completely.
The old topics were supposed to be moved here but have had no luck finding anything. I swear someone at FMI got a kickback from Jive to use Jive. I spend way too much time trying to find things here and usually need to give up when I do.