R.A.D modpack running very poorly

The modpack R.A.D's description on curse says that "at least 4GB" of ram should be used when making a server for it, while aternos only has 2700MB.

Any way to make it higher or is there no possible way for the server's computer to handle that?

Well, alright.

Wait, hold on.

R.A.D servers get less ram than RLCraft servers? Why is that the case?

Yeah sure, but, RLCraft's official wiki says "4 GB is recommended", that meaning that it requires less ram than R.A.D for a server to run normally.

Can you guys test the R.A.D servers, with at least two people, and go to different dimentions to explore in creative or something?