If you're using ctrl-r to see the framerate then its not using maxfpsbk anyway - that only works when the window is in the background. You have to specify just "maxfps" if you want the framerate reduced while the window is up in front of you as well.

Leave terrain distance all the way down, you can increase environment distance if you want (shows players and npcs further away, though I turn this all the way down on my clones also).