Fabric
Minecraft with Fabric mod loader
Single-Threaded Game
Minecraft is single-threaded. Add memory and reduce view distance. Adding CPU cores won't help.
Mods Must Match Client-Side
Players need the exact same Fabric loader version AND the same mods (with matching versions) installed to join.
EULA + RCON Auto-Wired
The EULA is accepted automatically on install. RCON uses the password and port from your Startup tab. The in-panel console connects to it. You don't need to touch server.properties or eula.txt.
Official Documentation