CPU, or Central Processing Unit, is that component of a home PC or a hosting server that runs all the calculations. Each CPU runs at a certain speed and the larger it is, the sooner everything shall be processed, so if you host resource-demanding web apps on a server, for instance, a quick processor will allow them to be executed quicker, which will significantly contribute to the whole user experience. The newer generations of CPUs have 2 and more cores, each of them functioning at a certain speed to guarantee a better and speedier performance. Such architecture permits the processor to control a variety of processes at one time or several cores to manage 1 process if it needs additional computing power in order to be executed. Of course, other factors such as the amount of RAM or the connection a given server uses may also affect the efficiency of the websites hosted on it.