DraStic

Maybe not exactly slow, but with lots of frame skipping and audio cuts, even with simple 2d screens.
I tried changing every option in the settings and it didn't affect the speed. I suspect it could have been the android rom (using stock, still not rooted).

Thanks for the suggestion, but I really don't like asking for a refund. I guess I'll have to think about it some more and maybe take the risk and buy it even if it doesn't work well.

Update: just tried it, runs too slow (Galaxy Tab 2). I got the refund from the Play Store. Still, it would be nice ...

Are there any plans to release a demo version? I'd like to see how well it works with my devices and how the controls feel without having to pay 6 €.