I have a hackathon this week and part of my goal is to port from floating point to integer math. It's killing the poor Mega. There are no delays in the processing at all and that's as fast as it will go. Arguably it would work much better out of the box with the Spark but I'm waiting for my favorite LED library to be ported there first. It's in the pipe right now so most of my code should just work.
I'll be so happy just to code! I have had zero cycles to play with this awesome toy since the new year. This is the week.