Consumption of rooms without hosts

Hi, I’m trying jitsi in docker and I’m worried about the performance, can somebody explain to me what’s the deal with the rooms without Host (with guests sessions allowed)? Like, do they “consume” resources at the same rate as a “fully functional rooms” (a conference with people talking with cams, etc.) or are the users in a pseudo-limbo where they just see the “wait for a host” sign and they don’t waste resources from the server?