The processor has an input “pipe” and an output “pipe”. Typically, a modern processor can handle taking input from various sources at once without a noticeable delay, but occasionally it will get stuck on one task. When that happens, the entire input pipe is shut off while the processor thinks about the problem that it is on. Usually it recovers, and opens the pipe again.
A similar issue can happen with RAM as well. Basically, the general concept when a computer freezes is data can’t get where it’s trying to go, because a part of the hardware is struggling to process something, which is holding up everything else. Like a pileup on the freeway.
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