According to the Linux gurus over at Phoronix, Ubuntu's gaming performance is, for the most part,
on par with Windows 8.1. I'm not sure if that is a good thing or bad.
Given the recent release of Microsoft Windows 8.1, at
Phoronix we took 13 different AMD Radeon and NVIDIA GeForce graphics
cards and compared the performance between Ubuntu Linux and Windows 8.1
with the same hardware and set of OpenGL games/benchmarks. For AMD and
NVIDIA graphics cards with their official drivers, the performance is
largely similar between the competing desktop operating systems but
there are some performance exceptions.