I had some performance issues with CocoonJS so I asked them on the forums for some assist.
"Ok, we've tried your zip on two devices.
First, on a Nexus7 with Android 4.2.1 it runs at 60fps at all times. Perfect.
Then, on a NexusOne with Android 2.3.6 things are a bit more interesting.
During the game itself, it runs at about 20fps, which is more or less OK for this device (using screencanvas would get you about 30-40 fps here, but Construct doesn't support that yet).
However, during the menu it's indeed freezing. The fps counter says it's 1-2 fps, but the image is completely frozen. Our guess is you're doing something that breaks the hardware in some way.
Maybe you're creating a really big canvas (over the max 2048 texture size) or something?"
Well I had no textures above 960 being the side panel scroll bars. However my layout is extraordinary large at a width of 9600. My assumption is that the layout is virtual space. So I'm asking. Is the layout canvas size or do I need to look elsewhere