CPU, or Central Processing Unit, is that component of a computer system or a hosting server that runs the calculations. Every single CPU functions at a particular speed and the bigger it is, the swifter everything shall be processed, so if you host resource-demanding web apps on a server, for instance, a fast processor will allow them to be carried out quicker, which will drastically contribute to the entire user experience. The modern generations of CPUs have 2 and more cores, each of them working at a certain speed to ensure a better and swifter performance. This type of architecture permits the processor to control different processes concurrently or several cores to address one process if it requires more computing power to be carried out. Needless to say, additional factors like the amount of RAM or the connection that a certain server uses may also affect the performance of the sites hosted on it.