CPU, or Central Processing Unit, is that part of a PC or a server which carries out all the calculations. Each and every CPU functions at a certain speed and the higher it is, the quicker everything will be processed, so when you host resource-demanding web programs on a server, for example, an effective processor will allow them to be performed much faster, which will greatly contribute to the entire user experience. The new generations of CPUs have 2 and more cores, each of them working at a particular speed to ensure a better and faster performance. This type of architecture allows the processor to control a variety of processes concurrently or several cores to manage 1 process if it needs extra computing power in order to be executed. Of course, other elements including the amount of RAM or the connection which a particular server uses can also affect the efficiency of the sites hosted on it.