Hippo keystrokes mod is an add-on for the modern Minecraft version that can display your CPS, and track your keystrokes insanely fast.
See the mod on Modrinth: https://modrinth.com/mod/hippo-keystrokes
Discord support server of the mod: https://discord.gg/S7mTtZxJZh

Features:

Dynamic Keystrokes: Watch your W, A, S, D, and Spacebar keys light up as you press them.
CPS tracker: Know accurately what is your current right/left CPS.
FPS Display: You can see your FPS anytime.
Custom Command: Control the display with a simple command.

How to Use:

To toggle the KeystrokesHippo overlay on or off, type the following command in the chat:
/hippoKeystrokes_toggle (1.0)
/hippoKeystrokes_toggle_gui (2.0)
Go to Minecraft settings/options, and there you can set the position of the keystrokes, and disable/enable everything.