That’s so common, in fact, that whenever a system slows down, people automatically assume it the CPU must be overloaded - even if the Task Manager shows that the CPU is spending most of its time doing absolutely nothing. The CPU simply can’t execute those instructions fast enough to keep up with everything we’re asking of it. Similarly, if we run too many programs at once, all making demands on the CPU, the system gets slow.
A faster CPU performs those instructions faster and gets us faster results.
We often place a lot of importance on the speed of our CPU. It runs programs, which are sequences of instructions causing it to perform calculations, and generally tells the rest of the computer what to do. The CPU, or Central Processing Unit, is often referred to as the “brain” of your computer. There are other possibilities as well, but if the CPU is spending most of its time in System Idle Process, then the CPU is not the source of any slowdown. The CPU is idle while it waits for the slower disk activity. More likely are out-of-RAM situations, where Windows has started to exercise the disk heavily, using the swap or paging files. If the System Idle Process is using most of your CPU resources, that means your CPU is readily available for other tasks, and not the source of any slowdown.
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