You call 2gb in use low ? I dont even get 2gb in gnome when i am on the desktop. If i run steam, lutris and firefox i might get passed 2gb.
Proof: Pop! OS topic / talk / support (all in one) - #161 by Michel
Even you posted less ram usage in gnome 
-> Pop! OS topic / talk / support (all in one) - #122 by Bourne