That depends on what you consider "Cheap FPS"...I've seen people who thought 80fps was bad and that's INSANELY GOOD. lol

First step is to try typing on all windows /console maxfpsbk 30(or 20 if you feel 30 isn't helping enough; this parenthesis part is obviously not part of the command, just to be sure lol); that made the biggest difference for me.

High player counts will still affect your FPS a little; my main window gets about 64fps capped around the world but in towns it drops to 30-50ish depending on how crowded it is but not as bad as my old system which got about 10 at best lol; it's simply a factor of player data, movement and gear/skills/etc being a big amount of data sent/received.