This isn't necessarily valve's fault though. It's because the devs will shit out a Linux build without even trying to run it or they just don't care.
Some games work great. Some don't work at all and shouldn't even be listed with Linux support.
I sincerely hope Linux takes off as a viable gaming platform. All the tools and components are there. The only thing missing at the moment is developer mindshare.
There are some problems and glitches unrelated to the games, in my experience (like how newer nvidia GPUs have screen tearing on Ubuntu -- unrelated to vsync, by the way -- and there's pretty much nothing you can do about it for the time being)
Ah, here it is. From https://www.reddit.com/r/linux_gaming/comments/3snvpc/steamo...
"took a quick peek at the latest Geekbench executable for Linux(3.3.2,) it was compiled with GCC 4.4.3 on Ubuntu 10.04 - a 5 and a half year old compiler. Windows version was compiled with MSVC 2012 update 4 released 2 years ago."
Take note: That ars article was done ~15 months ago (november 2015). In it, they used Ubuntu 10.04, which was released in April of 2010 (thus '10.04')! Steam wasn't even released on Linux, until nearly 3 years later, in 2013!
That article is so BS that you should ignore it outright. It's not even fit to be toilet paper.
Any sources to back up this claim? 10% performance hit compared to what? Windows? A different Linux distro?
I've found that for native games, Linux can actually offer better performance in many cases than the Windows version.
Someone also did a test recently (full video on Youtube) with the Windows version of the new Doom running on Linux through the WINE emulation (yes I know its not technically an emulator) via Vulkan and the performance exceeded the Windows version.