CPU, or Central Processing Unit, is that part of a PC or a web server that performs all the calculations. Each CPU functions at a particular speed and the bigger it is, the quicker everything will be processed, so when you host resource-demanding web applications on a hosting server, for instance, a fast processor will allow them to be executed quicker, which will greatly contribute to the overall user experience. The modern generations of CPUs have 2 and more cores, each running at a certain speed to ensure a superior and speedier performance. Such architecture enables the processor to handle various processes simultaneously or a number of cores to address 1 process if it requires extra computing power in order to be completed. Of course, other variables including the amount of RAM or the connection which a particular hosting server uses could also affect the overall performance of the web sites hosted on it.