One more thing. I was messing with the FPS caps in foreground and background and I found something interesting. Everything is much smoother if you set both foreground and background FPS caps at the SAME value.
Not sure if this is the same on any computer but on mine, when I had them different I would see some stutter when moving.
So right now I have both foreground and background FPS capped at 30 FPS on all 10 wows.