Did you try the solution that worked for me?
Device Manager | Software devices | Microsoft Device Association Root Enumerator (Right-click and Disable). This driver is only needed for really old hardware and can be re-enabled at any time.
This 100% cured stuttering in DCS for me:
Device Manager | Software devices | Microsoft Device Association Root Enumerator (Right-click and Disable). This driver is only needed for really old hardware and can be re-enabled at any time.