Hi Hannie727,
Welcome to Microsoft Community.
I'm Hahn and I'm here to help you with your concern.
I'm sorry to hear that you are experiencing keyboard and mouse input lagging issues on your laptop. Here are a few steps you can take to try and resolve the issue:
- Update Device Drivers: Make sure all your device drivers, especially those for the keyboard and mouse, are updated. You can do this through the Device Manager or by visiting the manufacturer's website for the latest drivers.
- System File Checker (SFC) and DISM: Run the System File Checker (SFC) and Deployment Image Service and Management Tool (DISM) to check and repair system files. Use the System File Checker tool to repair missing or corrupted system files - Microsoft Support
- Safe mode starts Windows in a basic state, using a limited set of files and drivers. If a problem doesn't happen in safe mode, this means that default settings and basic device drivers aren't causing the issue. Observing Windows in safe mode enables you to narrow down the source of a problem, and can help you troubleshoot problems on your PC. Start your PC in safe mode in Windows - Microsoft Support
- Creating a new user account is an effective troubleshooting step because it can help determine whether the problem is related to the entire system or just to a specific user account. Please follow the steps below to create a new user account: Create a local user or administrator account in Windows - Microsoft Support
If the problem does not exist under the new account, the problem may be related to your previous user profile. In this case, you can try to repair or reset the profile of your existing user account, or continue using a newly created account.
I hope these steps can help you fix your keyboard and mouse input lagging issues. If there is anything not clear, please do not hesitate to let me know.
Your Sincerely
Hahn - MSFT | Microsoft Community Support Specialist