[iainmerrick]

Right, so on Android if you need code to be fast, write it in C++.

If you have a ridiculously bloated and buggy Java app, writing an optimizing compiler doesn't sound like the most effective solution.

[spacemanmatt]

My take: If you can't write it fast enough in Java, it is probably not a good mobile app candidate in the first place. The Dalvik optimizer and the JIT yield a regularly reasonable experience for me.