CPU, or Central Processing Unit, is that part of a computer system or a hosting server that executes all of the calculations. Each CPU functions at a specific speed and the bigger it is, the quicker everything shall be processed, so when you host resource-demanding web applications on a hosting server, for example, a fast processor will enable them to be carried out speedier, which will considerably contribute to the whole user experience. The current generations of CPUs have 2 and more cores, each of them operating at a particular speed to ensure a superior and faster performance. This type of architecture allows the processor to manage a variety of processes concurrently or a number of cores to control one process if it needs more computing power in order to be performed. However, other factors such as the amount of RAM or the connection a given hosting server uses may also affect the performance of the sites hosted on it.