Paper
Minecraft
Single-Threaded Game
Minecraft is single-threaded. Adding CPU cores will not help. Only raw clock speed and config tuning do. Reduce view-distance, limit entities, watch redstone.
EULA Auto-Accepted
The Minecraft EULA is accepted automatically when your app is installed. You do not need to edit eula.txt.
RCON Enabled by Default
RCON is wired automatically using the password and port from your Startup tab. The in-panel console connects to it. You don't need to touch server.properties to enable it.
Official Documentation