Piefed server questions

Hi, can a piefed server be run only locally? Not to get any content from other servers? Local content, local users.
What are the minimum hardware requirements? Like cpu, ram? I understand it can eat more resources based on how much activity it has. But, can i get some examples on how much should or can a intel dedicated machine like 14900k with 64gb ram can handle? Is this software more cpu hungry or more ram needed?