All arithmetical and logical procedures inside a computer/server configuration are tackled by its Central Processing Unit, or CPU. This hardware component is sometimes called the "brains" of the PC as well. The pace at which the CPU runs system instructions is commonly referred to as its speed which is measured in Hertz. The quicker the processing unit is, the more quickly scripts and web apps shall be executed, even though the overall performance of the latter depends upon other things also - the read/write speed of the hard drive, the amount of physical memory, the network connectivity, and many others. All newer CPUs have multiple cores, which work together. Thus, the functionality and the workload that a CPU can take care of increase, because every single core can process various tasks separately and several cores can handle one task that cannot be processed by a single core.