CPU, or Central Processing Unit, is that part of a computer system or a hosting server which performs all of the calculations. Each CPU functions at a specific speed and the bigger it is, the quicker everything will be processed, so when you host resource-demanding web apps on a web server, for example, a fast processor shall enable them to be performed much faster, which will significantly contribute to the overall user experience. The modern generations of CPUs have two and more cores, each one operating at a particular speed to guarantee a superior and speedier performance. Such architecture permits the processor to control numerous processes simultaneously or a number of cores to handle 1 process if it requires extra computing power in order to be performed. Naturally, other elements including the amount of RAM or the connection which a given server uses may also affect the overall performance of the websites hosted on it.