so unless it’s a creative server with those 10 people building massive structures around spawn, it’s probably not that…
i’m kind of running out of ideas to be honest. i’d start with trying to run it in fastest, and changing the graphics options in game to see if you can’t reduce the load (use fps improvements as an indicator, and just go through each toggle switching them of, then see what each does when you turn it back on)
i suppose you could also go into task manager and increase the priority for rust, but i’d be careful; it’s just pulling memory to the game, and might cause other things to crash.
forgot to ask; how big is your paging file? it might be worth increasing it’s size if it’s not at least the same as your ram.