CPU, or Central Processing Unit, is that component of a home PC or a web server that executes all of the calculations. Every CPU functions at a specific speed and the higher it is, the quicker everything will be processed, so if you host resource-demanding web programs on a web server, for example, a quick processor will allow them to be performed much faster, which will drastically contribute to the overall user experience. The more recent generations of CPUs have 2 and more cores, each running at a specific speed to ensure a much better and speedier performance. This sort of architecture permits the processor to control different processes concurrently or a number of cores to handle one process if it requires additional computing power in order to be executed. Of course, other factors including the amount of RAM or the connection that a given hosting server uses may also affect the efficiency of the web sites hosted on it.