To display them, type "r_speeds 1" in the console.
You'll get a FPS (Frames per second) and some numbers.
wpoly is the world poly count. This is all of the faces you make in the editor. A good amount is 800, try to keep it under 1000.
epoly is the poly count of the models and entities like monsters and weapons. These count unlike the wpoly and can be much higher, but not outrageous.
The are many ways to lower r_speeds and keep the detail good. But that is a whole other thing.