Using Planeshift Setup: Start-All programs-planeshift-planeshift setup
try changing the texture downsampling bar, and see if that helps.
You can also report where you get those fps drops, if they happen in plaza or near it, is an issue that lot of people is having; neither CS or PS have a fully optimized code, so probably you\'re using gpu time to load things that shouldn\'t be loaded or that aren\'t significant and that causes the low fps.
You can also confirm that you don\'t have any utility running on the background that uses lots of cpu or hdd time.