I had a go, and liked it, but the results weren't as useful to me, as the bottom line is basically Android for my work. If I wanted to develop for iOS then I expect Cinder would be my first port of call.

Processing 2.0 significantly reduces the performance gap for the reasons jobleonard mentioned.  2.0 makes better use of the GPU by recording shapes in a VBO, along with higher levels of OpenGL support via JOGL 2.0.

Hi, thank you all for your responses. Great article, david wilson, the one on the  Robert Hodgin's Blog .

I've used both.  I started using Cinder because of performance concerns, and eventually ended up using the underlying Cairo graphics library, on it's own, quite a bit, for puzzle construction.  I still use Cairo for puzzle constructions, because I can get better number crunching performance for solving difficult puzzles via C/C++, while still having a rich graphics library that is capable of rendering both to the screen and to the PDF format that I publish my puzzles in.  I personally didn't need the additional features in Cinder, so I preferred to go straight to Cairo.