CPS Tracker [FORGE]
CPS Tracker is a client-side mod for tracking your clicks per second. It allows you to monitor CPS metrics in real-time directly during gameplay.
How to Use
Configure the position of left and right mouse button trackers through in-game settings (version 1.8.9). The interface can be easily moved around the screen for convenient statistics display.

The Lite version has different functionality. Use the "/cpstracker" command to toggle the display on/off.
Additional Screenshots

Lite version functionality differs from the full version of the mod.