CPU, or Central Processing Unit, is that element of a computer system or a web server that runs all of the calculations. Each CPU functions at a particular speed and the bigger it is, the sooner everything will be processed, so if you host resource-demanding web programs on a web server, for instance, an effective processor will allow them to be carried out more quickly, which will significantly contribute to the whole user experience. The more recent generations of CPUs have 2 and more cores, each one operating at a certain speed to ensure a much better and swifter performance. Such architecture permits the processor to manage different processes concurrently or a number of cores to address one process if it requires more computing power in order to be executed. Of course, additional factors like the amount of RAM or the connection a particular hosting server uses may also affect the performance of the sites hosted on it.