CPU, or Central Processing Unit, is that part of a home PC or a hosting server that executes each of the calculations. Every single CPU runs at a particular speed and the larger it is, the faster everything will be processed, so if you host resource-demanding web apps on a server, for instance, a fast processor shall enable them to be performed more quickly, which will significantly contribute to the entire user experience. The more recent generations of CPUs have 2 and more cores, each one functioning at a particular speed to guarantee a better and faster performance. This sort of architecture permits the processor to manage numerous processes simultaneously or a number of cores to handle a single process if it requires extra computing power in order to be executed. Needless to say, other variables such as the amount of RAM or the connection that a certain server uses can also affect the overall performance of the sites hosted on it.