CPU, or Central Processing Unit, is that part of a computer system or a web server that performs each of the calculations. Each and every CPU runs at a particular speed and the higher it is, the swifter everything will be processed, so when you host resource-demanding web applications on a hosting server, for example, an effective processor shall allow them to be carried out more quickly, which will considerably contribute to the overall user experience. The more recent generations of CPUs have two and more cores, each of them operating at a particular speed to ensure a superior and quicker performance. This kind of architecture enables the processor to handle a variety of processes concurrently or a number of cores to address one process if it requires additional computing power in order to be completed. However, other variables such as the amount of RAM or the connection that a certain server uses may also affect the performance of the web sites hosted on it.