All arithmetical and logical procedures inside a computer/server configuration are addressed by its Central Processing Unit, or CPU. This hardware element is usually called the "brains" of the computer system also. The pace at which the CPU runs system instructions is usually referred to as its speed and it's measured in Hertz. The swifter the processing unit is, the faster scripts and web programs shall be executed, even though the efficiency of the latter is dependent upon other things too - the read/write speed of the hard drive, the amount of physical memory, the network connection, and so forth. All modern CPUs have a number of cores, which work together. Because of this, the functionality and the workload a CPU can handle increase, due to the fact that every core can process various tasks individually and several cores can handle 1 task which cannot be processed by 1 core.