Yep, I have added this in the description of the game in iTunes.
I search a solution, the problem is only on the Touch 4 (Retina + 256mb of ram, I think it's the problem).
I think it can be cool if we could deactivate the x2 on some device :
http://community.stencyl.com/index.php/topic,6906.0.htmlI'll try to re-re-optimize the game but it's really hard, with the game itself + gamecenter, the RAM is really just on this device.
If you are ok, maybe you can test the future version via Testflight with this device ? I'm on it, I think it can be good this week-end, could help a lot, I haven't this device and it's not really used in France.