I assume you're running the Windows version of one of our games, so I'll answer for VV3 Windows. It sounds like something is running in your system that is consuming a high percentage of resources (making whichever game you're playing run poorly). Since all of our games operate basically the same way from a system perspective,
this answer for VV3 in our Support FAQ should help you.
When requesting support, it's a good idea to provide pertinent details, such as what is suggested in
How to get the best technical support.