Away3d shadows low fps on android

Hi! I’ve a problem with shadows. When I run basic LoadDate example on android it shows extremly low fps: about 10. I know that problem is with shadow casting and also I know that shadow casting is heavy operation. Maybe there is workaround about this? Actualy my final goal is to have shadow from one simple cylinder geometry, but with SoftShadowMethod or with HardShadowMethod it gives me about 20fps instead of 60.