MouserateFramerate

Limits game framerate if configurable activities have ceased for a configurable amount of time. A Minecraft mod which limits game framerate if configurable activities have ceased for a configurable amount of time. These activities includes voluntary movement, being hurt, using most items/swinging fists, or moving your mouse within the screen.

The Cloth API and Modmenu are highly recommended to access the settings in-game (Only Modmenu is necessary for the 1.17 jar).