CPU, or Central Processing Unit, is that part of a personal computer or a server that carries out each of the calculations. Every CPU runs at a certain speed and the bigger it is, the speedier everything shall be processed, so if you host resource-demanding web programs on a web server, for instance, an effective processor shall allow them to be executed speedier, which will tremendously contribute to the whole user experience. The modern generations of CPUs have two and more cores, each of them working at a certain speed to guarantee a superior and faster performance. This sort of architecture permits the processor to manage different processes at one time or several cores to control a single process if it requires more computing power to be performed. Of course, additional factors including the amount of RAM or the connection which a particular server uses can also affect the performance of the web sites hosted on it.