ZweiEuro

Ah, I accidentally read over that you used free -m.

By top 3 services do you also include any programs ? For me htop itself already consumes 10 MB, what are processes are running ?

Are you certain its actual ram usage and not reserved ? Usually when a program requests huge amounts of ram it is not given it until it actually writes to it. Try running free and check what it says.

I am A big fan of Vivaldi and its built-in email client ^^ Works like a charm for me.