This person is making a logical error. Their computer was running slow, so they freed up all the RAM they could. The computer immediately saw all that unused RA

This person is making a logical error. Their computer was running slow, so they freed up all the RAM they could. The computer immediately saw all that unused RAM, and filled it with temporary cache from the SSD, as computers do. It speeds up future reads and can be dropped immediately if needed for something else. Now he's taking that as evidence that the computer was wasting RAM the entire time, causing the slowness. To do it right he needs to open ram-hungry chrome tabs until the computer gives up all the RAM it can and screams for mercy, then subtract that amount from 8GB. That will give you the actual amount the system wont give up.