Using setsyncrate(60,1) gives me 60 FPS but also 13% CPU. Which is a little more CPU than running 0,0 and 1300 FPS.
However, simply loading in the music (without playing it) gives me a solid 60 FPS. And 4-5% CPU.
AGK seems to do something when the music is loaded. I am using 1076. Not sure how to do a demonstration of this. RTA is quite big so I guess it's about displaying sprites and perhaps running through some code each loop.
Funny thing about this testing is that I have discovered that my world map actually takes longer to process than playing the levels. Those got more sprites, code and working collisions. I can only guess it got something to do with the different sprites that are visible on screen.
Demo 3 is out now!