CPU, or Central Processing Unit, is that element of a computer or a web server which runs the calculations. Each and every CPU functions at a specific speed and the higher it is, the swifter everything will be processed, so if you host resource-demanding web applications on a hosting server, for example, a fast processor shall enable them to be performed more quickly, which will drastically contribute to the overall user experience. The current generations of CPUs have 2 and more cores, each of them running at a particular speed to ensure a better and faster performance. This sort of architecture allows the processor to handle different processes simultaneously or a number of cores to control 1 process if it needs additional computing power in order to be performed. Of course, other variables such as the amount of RAM or the connection a particular web server uses can also affect the overall performance of the sites hosted on it.