What is your ISP and your Download/Upload speed?
Also your Blackops 90-91fps is inaccurate. All COD's since the dawn of the games default limit fps to 85fps, but it sits at 90-91 and never goes over. IF you unlock the limit the fps can get way higher.
^Type that and it will unlock the limit in console. While the limit is on, even if you have 4 GTX580's it will still sit at 90fps.