All arithmetical and logical procedures within a computer/server configuration are addressed by its Central Processing Unit, or CPU. This hardware component is sometimes called the "brains" of the computer system too. The rate at which the CPU completes system instructions is generally referred to as its speed which is measured in Hertz. The quicker the processing unit is, the more quickly scripts and web programs shall be executed, although the efficiency of the latter is determined by other things too - the read/write speed of the hard disk drive, the amount of physical memory, the network connectivity, and so forth. All new CPUs have a number of cores, which work together. For that reason, the functionality and the workload a CPU can take care of increase, due to the fact that every single core can process several tasks independently and several cores can handle one task which can't be processed by 1 core.