All arithmetical and logical procedures within a computer/server configuration are tackled by its Central Processing Unit, or CPU. This hardware part is sometimes called the "brains" of the computer system also. The pace at which the CPU carries out system instructions is usually referred to as its speed which is measured in Hertz. The speedier the processing unit is, the faster scripts and web programs shall be executed, although the general performance of the latter depends upon other things as well - the read/write speed of the hard drive, the amount of physical memory, the network connectivity, and so forth. All new CPUs have multiple cores, that work together. For that reason, the functionality and the workload that a CPU can tackle increase, since each core can process various tasks independently and several cores can handle one task which can't be processed by a single core.