I think v8 might be slower for ii than previous versions - based on the complaints. I suspect more bandwidth is being used in general. If you are running a weak wireless system or a slow wired system or if your server is not running a ssd, then the weaknesses in you network are showing up.
Can wait for ac to improve. But I wouldn't count on a timely easy fix. So spend some money or time on the above troubleshooting. If it reads like Greek there are some very patient experts here. Or maybe save some headache and hire a pro.
For wireless users just try to copy a 250 mb file from your server to your workstation. If you have a giant ii folder it shouldn't be worse than that. If it takes 10 min to copy you have a network problem or a disc speed problem.
I have my share of ac gripes, but with good network and ssd server and for my workstation load ii is not one of them. Now Escribe with required formulary check for MU? Just about driving me crazy. I do blame the Feds for half of that problem. Why do I have to check formulary for what I know are cheap generic drugs...;(