There are some links that shows the superior performance of Gideros Studio:

* A forum post: Hi guys! New gideros user here!
* A detailed comparison: Teach me how to...: Who is faster?
* Comments from Gideros Studio users (also covering performance): So, what all did you try before falling in love with Gideros?

You can always search on Google to receive better results. Btw, Gideros Mobile has a good funding recently, has 3 staff now, also one more to be added in April.

Disclaimer: I personally know the founders of Gideros Mobile.