The AMD Radeon RX Vega Launch Performance Compared To 2019 Linux Drivers
Metro Last Light Redux with OpenGL on Linux was a few frames faster.
Valve's aging Portal game while easily running at several hundred FPS did show around a 13% performance boost with the ongoing Linux driver improvements.
The minimum power consumption also showed nice savings for Portal that isn't demanding at all with newer GPUs.
The 2013 Tomb Raider Linux port also showed nice performance and power advantages to the latest Linux driver state.
For those into open-source games, the SuperTuxKart OpenGL game saw minor performance improvements compared to launch.