CPU, or Central Processing Unit, is that component of a home PC or a hosting server which carries out the calculations. Each CPU operates at a particular speed and the larger it is, the quicker everything will be processed, so when you host resource-demanding web programs on a web server, for instance, a fast processor will enable them to be executed quicker, which will significantly contribute to the entire user experience. The newer generations of CPUs have two and more cores, each one functioning at a specific speed to guarantee a better and swifter performance. Such architecture makes it possible for the processor to handle a variety of processes concurrently or several cores to address one process if it needs extra computing power to be carried out. Of course, other variables including the amount of RAM or the connection which a particular server uses could also affect the performance of the sites hosted on it.