[2021] Mouse lag/stuttering

Could you try a ‘Selective Startup’ and see if the issue persists, please?:

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

Are you using the SteelSeries Engine by any chance?