The PSP emulator, PPSSPP [Official Site], recently had a pretty big release which now defaults to Vulkan as the main renderer. They also enabled a shader cache for Vulkan too, which should help smoothen a few games out.
This is great, especially since PPSSPP is free and open source under the GPL and you can check it out on GitHub.
They didn't just work on improving their Vulkan support, as the OpenGL backend also gained proper multithreaded support to give a speed boost too. Useful for those where Vulkan doesn't quite work right just yet.
This release also comes with various other performance improvements and bug fixes. They mention Retroarch support like it's new, but looking around it seems that's been a thing for a while which is confusing.
Great to see another emulator pushing forward to keep a platform alive. I don't really do any emulation personally, but it's great for those that do.