Unity 6.8 Doesn't Change Much For Performance
The Nouveau driver did not regress with the Xonotic game under Unity 6.8 like
had happened under the Radeon driver.
Overall, for the two tested hardware graphics drivers (Radeon and Nouveau), there isn't really any performance improvement out of the Unity 6.8 desktop upgrade and with the Radeon R600g testing the Xonotic results were heavily slammed.
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