I have been working on my game for android and have had serious lag issues with cocoonJS. the main issue i had i just solved thru trial and error and wanted to share. to stop object collisions causing slowdowns or stops.
do this object 1,2,3,4
object 1 is overlapping object 1 set object 1 x to object1.x+10
object 1 is overlapping object 2 set object 2 x to object2.x+15
object 1 is overlapping object 3 set object 3 x to object3.x+17
object 1 is overlapping object 4 set object 4 x to object4.x+20
object 2 is overlapping object 1 set object 1 x to object1.x+10
object 2 is overlapping object 2 set object 2 x to object2.x+15
object 2 is overlapping object 3 set object 3 x to object3.x+17
object 2 is overlapping object 4 set object 4 x to object4.x+20
object 3 is overlapping object 1 set object 1 x to object1.x+10
object 3 is overlapping object 2 set object 2 x to object2.x+15
object 3 is overlapping object 3 set object 3 x to object3.x+17
object 3 is overlapping object 4 set object 4 x to object4.x+20
object 4 is overlapping object 1 set object 1 x to object1.x+10
object 4 is overlapping object 2 set object 2 x to object2.x+15
object 4 is overlapping object 3 set object 3 x to object3.x+17
object 4 is overlapping object 4 set object 4 x to object4.x+20
i hope this helps some other indie developers out there my game is running a lot smoother now.