[2021] Mouse lag problem possibly unrelated to my heavy stuttering problem

Please try a Selective Startup and see if the issue persists:

1. Press the Windows key
2. Type ‘msconfig’ and select ‘System Configuration’
3. On the ‘General’ tab, select ‘Selective Startup’
4. Deselect ‘Load startup Items’
5. Reboot your PC
6. Launch Vermintide 2 as normal, and see if the issue persists

It may sound irrelevant, but which other USB devices do you have plugged in?