When discussing Eaglercraft and projects like "Eaglercraft 1.20.1 hot," it is important to understand the legal context. Eaglercraft is a third-party recreation that is not officially endorsed or supported by Mojang Studios or Microsoft, the owners of Minecraft. The project exists in a legally gray area, as it reverse-engineers and emulates the mechanics of a proprietary game.
If the "Hot" version feels laggy, try these tweaks: eaglercraft 120 1 hot