Okay, so I'm a week late on this, but what the heck. Dolphin 5.0 was released on their website. The project is a Wii and GameCube emulator that is available for Windows, Mac, and Linux. This version focuses on compatibility. They claim that about 85% of titles, including WiiWare and virtual-console games, can be played from start to finish, with about 14% of all titles doing so flawlessly.
That said, it also adds several performance features. They improved the JIT compiler, added texture pooling to prevent reloading the same texture over and over, and even added DirectX 12 support, although they don't elaborate on why that would be useful for this workload. While they have not extended support to Vulkan, they do use the “Approaching Zero Driver Overhead (AZDO)” features of OpenGL and its extensions to raise performance on other platforms.
The emulator is available at their website.