Just to exclude the remote possibility that the RAM has failed and it has to swap data from/to the HDD as a result, have you checked in the system dialog how much RAM it's showing you? It should show the correct amount & not be totally full when doing nothing.
Replying to @pekkagaiser
just ~ 40% of the RAM is used :( I pretty sure it's from the fucking windows update, because it stop when I block internet.
2:54 AM - 31 Oct 2018
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