Yeah, this thread is missing a lot of vital information.
M4XW specifically said there are no release notes, no support, nothing. This is not intended as a release. This is merely a super-alpha build he compiled and put up on his host and made a quick post. Its just a test build and future changes will be merged upstream with retroarch for a full official release.
He did confirm this uses hardware acceleration with the new libnx, and thats literally the only detail he is sharing.
After testing I can say that mario kart runs poorly, but mario 64 probably runs well as that one has much lower requirements. Also, you should know preformance wont really increase until there is a dynarec implementation. So don't hold your breath for a build next week! There's a bounty on the dynarec.
I actually can't even get it to run anymore lol. After trying mario kart, when I hit the home button it went to home screen but audio from MK kept playing. I had to force shut down the switch. Upon reboot, corrupted install. I was able to reinstall and launch, but it crashes upon selecting games to run, requiring a hard power off.
I updated my post on the first page with more information to help you run this if you desire to test. M4XW is well aware of all of the issues now however, and it needs quite a bit of work so I would just sit back and relax, enjoy a kit kat bar until we see some stability increases.