Just so you know, my Nvidia Shield Portable has been rooted and is using the SetCPU app to make the CPU run at a faster rate, so my Portable is a bit faster than a stock one. That said, a number of games I’ve used have been working quite well and I haven’t had many issues with slowdown.
Also, I’ve been looking at the new version 24 that you were asking if people wanted to test with new keypresses and the like. Would love to give that a try if you’re willing.