The first Unity 5.12 benchmarks up are from a system with a Radeon HD 4890 graphics card running on the open-source driver stack. Following the Radeon Gallium3D results with Unity and Unity 2D are then some fresh Nouveau numbers as well from a separate system. Swap buffers wait was disabled for the Radeon testing. All benchmarking was handled in a fully automated and reproducible manner using the Phoronix Test Suite.
The Doom 3 frame-rate on the Radeon HD 4890 with Gallium3D driver goes up by 11% when moving from Unity 5.10 to Unity 5.12. While Unity 2D 5.12 didn't offer any performance improvement over Unity 2D 5.10, the non-Compiz 2D version of the Ubuntu desktop was still noticeably faster -- 27% faster than Unity 5.10 and still 15% faster with the latest Unity 5.12 release.