About that lag issue on every tick, well in my project I build a way to Set Animation action ever tick below the main every tick that set the position of the player.
https://www.dropbox.com/s/8nhrxd39el5zcnv/sample.png
Here I have 2 vars: animationSet (With the name of the animation) and animationType (A number to chose from the animation possibilities)
With this, there is no lag at all.
But in case of this been actually a bug from the .scml/.scon file, I will implement the normal way of set animations anyway and let deactivate.
I hope I could help, sorry for no .capx file, just took the picture from my project.
So basic, If you set the animation every tick below the main every tick where you set the position of the .scml/.scon to the rectangle, will be no lag.