Your native resolution would be "competitive" allowed. I'm sorry but 640x480 and 800x600 are horrible resolutions for such a game now that we can do soo much better. What you're seeing is the result of No Vsync. Your video card at such low resolutions, is generating hundereds of frames per second more than what your monitor can display, and you're getting LOTS of tearing as little bits of each frame get sent before the frame is discarded entirely but not displayed entirely (this is called tearing). Either turn on Vsync, or use your native resolution. Trust me, you'll be a better player for it, you'll be able to see enemies a lot further away, and they won't just be a single stick of pixels in the distance.
No offense, but those resolutions should never be used again unless you have no other alternative. And competitive play no longer limits your resolution, nor should it have in the beginning.
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