Your description matches the current situation more than the system socialists imagine. Most of the people wishing for communism don’t wish for what you describe. Those people usually wish for a system where the working class wields the power in a way Marx wrote about.
So many peoples view on communism is shaped by the same populist propaganda we had since the 40ies.
I’m sorry but low RAM usage is not good performance, those are not the same.
Also, I’ve read somewhere that all memory not in use is wasted memory. I find that thought really interesting. If an operating system would be able to always maximize RAM usage by loading every peace of software and information it uses or is about to use without using swap or a pagefile it shoud be more responsive I think.