The Guru of 3D published a review on the Article: Windows 8.1 vs 10 graphics performance analysis
A quote from the article:
With Windows 10 released yesterday the question quickly rises, is there a performance gain with Windows 10 already? Next to that with threaded optimizations will gameplay be more smooth ? In this article we'll have a quick look at Windows 8.1 vs 10 graphics performance with the help of four of our regular benchmarks and FCAT results. In this article we will use both a GeForce GTX 980 Ti and Radeon R9 Fury.Article: Windows 8.1 vs 10 graphics performance analysis @ Guru3D
Now this is merely a quick overview, but I have ran some benchmarks for you guys to compare a little to understand if at you may expect your graphics performance to improve.