This inspired me to make my own test. More of an object count test and much uglier
I use bullet behavior for the trees instead of parallax layer and the trees only have 4 parts. Layers are only used for layer effects (AdjustHSL). Was wondering how this would run on a weaker systems. Some small extra optimisation could still be done.
https://dl.dropboxusercontent.com/u/104893773/C2%20Testit/Shmup%20test/index.html
Also does anyone know if there is an easy way to switch between integrated GPU and dedicated card. I have Intel Core i5 3570K (Ivy Bridge) CPU and it has integrated Intel HD 4000 that would be nice for testing.
Edit: Changed it to use layer scale. Much nicer and easy effect. Also added one more cloud and tree layer.