CPU, or Central Processing Unit, is that element of a computer or a web server which performs all the calculations. Each and every CPU operates at a certain speed and the higher it is, the faster everything shall be processed, so in case you host resource-demanding web applications on a server, for example, an effective processor will allow them to be carried out speedier, which will considerably contribute to the entire user experience. The newer generations of CPUs have two and more cores, each of them functioning at a certain speed to guarantee a better and quicker performance. This kind of architecture makes it possible for the processor to control different processes simultaneously or a number of cores to manage 1 process if it requires extra computing power to be performed. Obviously, other factors like the amount of RAM or the connection which a given web server uses may also affect the efficiency of the web sites hosted on it.