I am on a mac but somethings are the same and yes compression can be a problem. Rule of thumb, don't compress untill you are done!!!!! Your first issue really is the low ram. 800 mgh is great, but upgrade the ram. Also the program you render in makes a differance. You can develope in one program, do not compress, dump it in a higher end program and render there and compress if you like what you see. I am 500mgh, 768 ram which I boot up with virtual memory. It is slow going but it works.