NVIDIA GeForce: Windows 10 vs. Ubuntu 15.04 Linux OpenGL Benchmarks
When switching over to Xonotic's ultimate image quality settings at 1080p and 4K, the results remained very different between platforms. Last year when encountering Xonotic performance issues on Linux and in communicating with NVIDIA, it resulted in one of their developers filing this bug report and correcting the issue. Xonotic 0.8 was released this January with that fix. It will be interesting to see if NVIDIA has any insight into this new issue, and will update accordingly if there's any new information.
The synthetic GpuTest results didn't yield any exciting results for this fresh Windows 10 vs. Ubuntu 15.04 comparison on the latest proprietary drivers.