n4eem,
I agree with V-CeeOh. I didn't hear anything unusual at all. I 'm not sure what you expect from any synth/workstation when it comes to sound switching in a live situation. What I heard is no different than any other board I've owned (Roland, Ensoniq, Kawai, etc.). Anytime any Effects are in the mix, a delay, however small, is inevitable.
Other folks haven't responded with any similar issues/problems because they simply don't have the same (possibly unrealistic) expectations. I don't think you have a 'bug' on your Fantom, much less 3 seconds!
Bassman
Bassman