All arithmetical and logical procedures within a computer/server configuration are addressed by its Central Processing Unit, or CPU. This hardware component is oftentimes called the "brains" of the computer system also. The pace at which the CPU executes system instructions is also referred to as its speed which is measured in Hertz. The quicker the processing unit is, the more quickly scripts and web programs will be executed, although 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, etc. All newer CPUs have numerous cores, that work together. Subsequently, the overall performance and the workload a CPU can tackle increase, since each core can process a number of tasks individually and several cores can handle 1 task that cannot be processed by one core.