CPU, that's often called just "processor", is an abbreviation for Central Processing Unit. That is the core of each computer or server, due to the fact that it performs all of the calculations and logical input/output procedures. Even though the performance of a site or an application depends on other things too, including the amount of physical memory or the online connectivity of the web server, the rate at which a particular processor runs determines how quick an app will be executed. Later-generation processors have a number of cores that can considerably improve their overall power and efficiency, as every core can control a variety of processes independently or several cores can take on one process that needs a substantial computing power. Since each core operates at a certain speed, this architecture can be viewed as numerous separate processors cooperating.