Magic Mouse lagging with Monterey

Hello gmpizzuto,

If your Magic Mouse isn't working properly, there isn't too many troubleshooting steps you can do to fix it on your own. You can check over these basic steps: If you can't connect your Magic Keyboard, Magic Mouse, or Magic Trackpad to your Mac

Also run over this checklist to make sure there's nothing that may be causing interference with the Bluetooth connection: Resolve Wi-Fi and Bluetooth issues caused by wireless interference

Aside from that, you'd want to contact Apple to see what type of service options are available to get the mouse repaired: Get Support

Cheers!