CPU, or Central Processing Unit, is that element of a personal computer or a hosting server that carries out all the calculations. Every single CPU operates at a certain speed and the bigger it is, the sooner everything will be processed, so when you host resource-demanding web applications on a web server, for example, a fast processor shall enable them to be performed faster, which will considerably contribute to the whole user experience. The current generations of CPUs have 2 and more cores, each working at a specific speed to ensure a superior and quicker performance. Such architecture allows the processor to control a variety of processes simultaneously or a number of cores to manage 1 process if it needs extra computing power in order to be executed. Obviously, additional factors such as the amount of RAM or the connection which a given hosting server uses could also affect the efficiency of the Internet sites hosted on it.