All arithmetical and logical procedures in a computer/server configuration are handled by its Central Processing Unit, or CPU. This hardware part is typically called the "brains" of the PC also. The pace at which the CPU completes system instructions is also referred to as its speed and it's measured in Hertz. The quicker the processing unit is, the faster scripts and web programs 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 many others. All newer CPUs have numerous cores, that work together. Subsequently, the functionality and the workload which a CPU can take care of increase, since each and every core can process various tasks individually and a number of cores can handle a single task which can't be processed by one core.