Hello Mehmet Ates,
good evening.
CPU usages and RAM usages can only become an issue when really a lot of people simultaneously use the Remote Desktop. But then you would have installed a Terminal Server and I do not hear you having done that.
Thus I would think that the maybe first real important requirement for using Remote Desktop is that you have your Network Connection and Activity in order. Wrong network configurations and failures would drastically kill your Remote Desktop experience.
Yours sincerely,
Bjarne Petersen