MS-Win10: November 30, 2017—KB4051963 addresses issue with Forza 7

Troubleshooting Hub Legacy Troubleshooting Legacy Motorsport Issues
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You have to check for updates.

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never had an issue with it on a gaming laptop with an i7 6700k and a 1070.

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I have no idea what they did in the MS update but along with a GPU driver update I am seeing improved frame rates in races where I’m in the midst of 20-24 cars. Which is new for me.