I wouldn't use custom buffer size. It should be left alone as default which should be the same as your max bitrate. I may be wrong.
Everything seems alright here otherwise. Odd choice of base resolution since makes a wacky aspect ratio, but not a big deal there. Most computers should run this base resolution. I also don't know much about the advanced options because I don't use them.
Are you sure you are not streaming?
I am absolutely, 169% sure that I am not streaming.
Also I will test out with a buffer size of the bitrate. As far as I can tell, there isn't any difference between a buffer size of 0 and a default buffer size.
Still, I can't really have something happen too fast on-screen or else it starts getting choppy.
If it helps, my PC is duel core.
Edited by Coolgamer012345, 05 June 2015 - 05:45 PM.