Does using a lot of layers affect performance?

1) If each layer is has no effect or parallax.

2) If each layer has different parallax value.

Also has somebody noticed that if you make a new layer and put it under the default 'layer 0' that C2 creates the objects of those layers go behind the canvas. Is this a bug?

I don't know. Probably the best way to test it is to acquire from somewhere a cheap Android phone or tablet and try it. I have a 2 year old 7" Android 4 tablet which cost me about £30, if it runs on that it will run on anything pretty much. Sometimes people have old smartphones they have upgraded, these might make good testing platforms as well.

I don't think layers affect anything; it's what you put in them. No it's not a bug; the bottom-most layer has transparency disabled by default.

Layers have virtually no performance impact unless you:

1) add a shader effect

2) change the opacity from 100%

3) change the blend mode to something other than "normal"

4) enable "force own texture"

All of the above will force the layer to render to an intermediate texture, which has a memory and GPU fillrate overhead. Note parallax has no effect, it does not cause this.

Thanks for the reply paulscottrobson and Ashley and Tokinsom for clarifying my doubts.