All arithmetical and logical procedures within a computer/server configuration are addressed by its Central Processing Unit, or CPU. This hardware element is oftentimes called the "brains" of the PC too. The pace at which the CPU carries out system instructions is generally referred to as its speed which is measured in Hertz. The faster the processing unit is, the quicker scripts and web apps shall be executed, even though the efficiency of the latter is determined by other things as well - the read/write speed of the hard disk, the amount of physical memory, the network connection, and so forth. All current CPUs have numerous cores, that work together. Thus, the efficiency and the workload which a CPU can take care of increase, as each core can process different tasks separately and numerous cores can handle 1 task which cannot be processed by one core.