My PC just had a big Windows 10 update (i was already using windows 10 - this is just some update they're rolling out these days). Before the update I'd be getting 90 to 100 fps with 19 or 20 cars on track. after this update, I'm now getting 30 or 40 fps. I've checked through all the video settings in game: nothing has changed. I've updated my Geforce drivers. I reconfigured SLI after the update and got that back to how it was before. I have two GTX 780s and triples. Has anyone got a clue what the fix is? I'm a bit desperate.