eli5 – Why pc lag or slow down when severals apps are open but the cpu and memory are not used at 100%?

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I know that this might vary from case to case, depending on which PC and which app I have open, among other factors. However, I noticed that with all that I had open, regardless of the apps or games running, when the PC starts to slow down or lag, the CPU or memory is not used at 100%, but stays between 70% and 90% depending on the situation. What could be the reason?

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7 Answers

Anonymous 0 Comments

Do a task requiring 10% of your focus. Now do 7 of those simple tasks at the exact same time. It isn’t 7x harder, it’s 20x harder.

The cpu has to clear and unclear caches, transfer data between components, wait on the disk even with SSDs.

Although it isn’t working that hard when it has a task, it’s interns are running all across the office gathering stray papers. The boss must wait. You must wait.

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