I try exporting my game to android, it runs fine on PC, but when it's on android it's slow. And it's a new android, a Samsung Galaxy. Why is it slow? It's not as large as the other games I have on there.
Did you optimize it at all on Android devices while you make you game?
ie. Add some stuff, test it, add some more stuff, test it... repeat til its done. That way you know what caused the performance issue.
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There might be a lot of reasons. Too big sprites, too many sprites, loops, text objects etc. Read performance tips and try to optimize it step by step. If it's not a big game you should be able to make it run fine.
Good luck, i have the same problem.
I have an idea, instead of having hundreds of blocks, which have 4 collision points each, just have much fewer blocks behind a layout picture of the level.
Would this help?