I’m not sure what you expect here. You’ve told us almost nothing about how you are rendering your scene (whether you’re using a CPU software OpenGL context or a GPU accelerated context, how many tris, what draw method, screen resolution, frame buffers, post processing, shaders or fixed-function shading, etcetc.).
Please see The Forum Posting Guidelines for tips on composing a post that is much more likely to get you useful feedback.
Also, run this:
and tell us what you see in the Implementation → Implementation details section.