It's the original res for the game and it simply plays smoother. There's several key advantages to it, gun recoil is lessened, easier to see through smokes, less fps drop, etc etc.
Yes, it looks like mario, it's blurry, but you will get used to it I promise. Forgive me if I jump around, I'll try to stay on topic in some sort of orderįirst, I HIGHLY recommend that you learn to play on 640x480 resolution in CS. I decided to make a guide to help everyone out with fps and gameplay speed performance.