I'm using a New 3DS, and I'm getting a little over 30FPS at maximum rendering quality (casting 400 rays, i.e. the full horizontal resolution of the screen). Turning the quality down to 200 rays, as in my previous post, gives a bit over 60FPS.
Wow, that sounds great! I just hope it also runs decent on a regular 3DS... If there's anything that would ever get me to buy a New 3DS, it's probably SmileBASIC, ha!