All arithmetical and logical functions inside a computer/server configuration are tackled by its Central Processing Unit, or CPU. This hardware component is occasionally called the "brains" of the computer as well. The pace at which the CPU carries out system instructions is typically referred to as its speed which is measured in Hertz. The faster the processing unit is, the quicker scripts and web programs will be executed, although the overall performance of the latter depends upon other things too - the read/write speed of the hard disk, the amount of physical memory, the network connection, etc. All new CPUs have a number of cores, that work together. Thus, the functionality and the workload which a CPU can manage increase, due to the fact that every single core can process different tasks independently and numerous cores can handle a single task which can't be processed by 1 core.