On my G5, FSS takes a while....like minutes. Of course, it depends on where you are and which CC it sees first, but it's doing a band scan starting at the bottom of VHF and then up though 7/800 MHz so it has to chew through a lot of spectrum.
I just did it for ARMER here in Minnesota. It didn't take too long.
But, then, I am only going through 10 mHz.
I think for WISCOM, the next time I do programming, I might have one knob position for VHF only, since much of the state is VHF only.
Then, I would have another one for 800 mHz when I am in those areas that have it.