Scratch

I'm sorry if this has already been talked about before, but I really can't find any straight out answers to it. I am writing a scratch program that reads in two lists, framebuffer and brightframebuffer, for hue and brightness, and then plots it out using the pen. Even in turbo speed, the program is very slow, and bound to be even slower once I hook it up to a practical application such as a real-time game (especially in 3D, like it should be able to handle) My question is, what kind of optimizations can I perform, as in turbo-speed it still runs like a snail.

Thanks again,
-bobbybee