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Nvidia released a driver update for their GeForce graphics cards, version 378.49 which was reported to leak VAS. They later released another update, version 378.66 which fixed the leak but still had P3D running high VAS usage. The only solution was to roll back to version 376.33 and hope Nvidia fixed the issue.
After being a little annoyed, I actually took it upon myself to simply report this issue to Nvidia using their forums. Prepar3d doesn’t get much, if any, attention in the GeForce forums so it isn’t any surprise the problem existed in two driver builds. After posting the issue with links to the Prepar3d forums I was asked to try the hotfix 378.72 driver to see if the problem was fixed.
I’m happy to say the hotfix driver solved everything and appears to be stable with P3D! In addition, I am actually seeing better VAS results than I was on the 378.66 build. So, if you’d like to update your drivers, go ahead and grab the 378.72 build and see how it goes for you.