CPU, or Central Processing Unit, is that component of a PC or a hosting server which carries out each of the calculations. Every single CPU runs at a particular speed and the higher it is, the quicker everything shall be processed, so if you host resource-demanding web apps on a server, for example, a powerful processor shall enable them to be performed faster, which will significantly contribute to the overall user experience. The newer generations of CPUs have two and more cores, each one functioning at a particular speed to guarantee a better and speedier performance. Such architecture permits the processor to control different processes all at once or several cores to control a single process if it needs extra computing power in order to be completed. Of course, other variables including the amount of RAM or the connection a specific web server uses can also affect the performance of the websites hosted on it.