All arithmetical and logical functions in a computer/server configuration are addressed by its Central Processing Unit, or CPU. This hardware part is oftentimes called the "brains" of the PC as well. The pace at which the CPU completes system instructions is usually referred to as its speed and it is measured in Hertz. The swifter the processing unit is, the speedier scripts and web applications shall be executed, even though the general performance of the latter is dependent upon other things as well - the read/write speed of the hard disk, the amount of physical memory, the network connectivity, and many others. All new CPUs have numerous cores, that work together. Because of this, the overall performance and the workload that a CPU can take care of increase, because each and every core can process a number of tasks individually and numerous cores can handle one task which cannot be processed by a single core.