your internet connection does not affect framerate.

past 2 days I've been having the shittiest of latency to Diablo 3 server (red bar, 600 to 900++++ ms.)

FPS never dropped. only problem is you have a 0.5 to donno how many seconds delay that it's insane to play Inferno / Hell mode. Nightmare mode also die so many times.

and 0.5 seconds could be a matter of life and death, in which I experienced way too many times past few days.