Question 3.9GB RAM usable, but it reaches 90% when I'm using only 1.2GB of RAM.

Feb 23, 2019
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Hey there, I have a 4GB RAM and it says 3.9GB usable, I don't mind that. But when I check, the percentage reaches about 85%-90% when it's at like 1.2GB RAM used.

I'm really concerned about this, is there any fix?