YSlow's primary purpose is to help you make sure the browser renders each page in the minimum amount of time. However YSlow does not only apply to browser rend

YSlow's primary purpose is to help you make sure the browser renders each page in the minimum amount of time. However YSlow does not only apply to browser rendering, following 6 of the 13 YSlow rules will result in a reduction of the total work the server must perform for each request.