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Why does strict tracking protection slow my computer down?

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I've used Firefox's protection settings on strict, until I realized how much it increases my CPU usage. This was during some experimenting after I've noticed that my Task Manager states 70%; a majority of it being used by the browser's engine (I kept it on standard and installed uBlock Origin since then).

What's with that?

I've used Firefox's protection settings on strict, until I realized how much it increases my CPU usage. This was during some experimenting after I've noticed that my Task Manager states 70%; a majority of it being used by the browser's engine (I kept it on standard and installed uBlock Origin since then). What's with that?