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In page Mach (kernel):

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However, implementing pipes in memory buffers forced data to be copied from program to program, a time-consuming and resource intensive operation. This made the pipe concept unsuitable for tasks where quick turnaround or low latency was needed, such as in most device drivers. The operating system's kernel and most core functionality was instead written in a single large program. When new functionality, such as computer networking, was added to the operating system, the size and complexity of the kernel grew, too.[citation needed]