When I test my game with the simulator it's working and running fast. On my android tablet the game just shows white screen after the splash image.
It's normal. Directcanvas for android is still under development and not yet available.
There's a closed beta, more info here.
appmobi.com/dCAndroidbeta
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Yeah, directCanvas is not actually available for Android yet, but they're working on it. For the time being try the CocoonJS launcher for Android.