"Why tune my system? This is probably the first thing you want to know. When a distribution is packaged and delivered to clients, it is designed to be fully compatible with most of the computers available in the market. This is a very heterogeneous set of hardware (hard disks, video cards, network cards, etc.). So distribution vendors like Red Hat, SuSe, Mandriva and the rest of them choose some conservative configuration options to assure a successful installation. For instance, probably you have a very advanced hard disk with some special features that are not being used due to standard configuration settings. To summarize: your Linux distribution goes well... But it can go even better!"