CPU, or Central Processing Unit, is that part of a home PC or a server which executes the calculations. Every CPU runs at a specific speed and the larger it is, the swifter everything shall be processed, so if you host resource-demanding web applications on a server, for instance, a fast processor will allow them to be performed speedier, which will considerably contribute to the whole user experience. The new generations of CPUs have two and more cores, each one operating at a particular speed to guarantee a better and quicker performance. This sort of architecture makes it possible for the processor to manage numerous processes at one time or a number of cores to address one process if it requires more computing power in order to be carried out. Obviously, other factors like the amount of RAM or the connection that a given server uses can also affect the efficiency of the Internet sites hosted on it.