Zink, the OpenGL implementation on top of Vulkan continues to be an exciting development for Linux open source graphics drivers, with some new code landing in Mesa to improve its performance.
The code in question relates to a Suballocator, something that developer Mike Blumenkrantz who has been contracted by Valve blogged about that we covered back in June. Even back then, Blumenkrantz showed how Tomb Raider running on Zink with this new code went from 9FPS to 91FPS (those are the last specific numbers given).
Only recently this code actually landed in Mesa, so it should appear in the next major release being 21.3 due later this year. In the commit message, Blumenkrantz mentioned how "performance in games like Tomb Raider has been observed to increase by over 1000%".
Keep in mind this is not an increase compared with running the game normally, but between the original Zink code and Zink with the Suballocator. Not all games are going to see such a dramatic increase either. Still, the point is that Zink as a driver is starting to really mature and eventually you may be able to run many more OpenGL games with Vulkan instead by just using the Zink driver on Linux.
Additionally, Zink also now supports OpenGL compatibility contexts which some games use, so running even more with Zink should now be possible.