I asked the author, and he says that the 10% difference between Ubuntu and Chakra means that for every 10fps you see under Chakra you would only see 9 under Ubuntu.
So, if I run RO at 80fps in Chakra, I would get 72fps in Ubuntu, doesn't seem a like a lot of difference to me. But I think sutch conclution should be made with the game running (who knows how well the NGD engine performs compared to the Engine used in the benchmarks).
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