A while back I posted a quick performance comparison between my Monkey port of Box2D and libGDX's JNI version. At the time the libGDX version was about twice as fast.
Since then I've done a bit of optimisation work and I thought it would be worth posting to note that I've just uploaded 1.0.12 of the port and to update the figures.
The Monkey performance on the same domino stack benchmark from the previous post is now ~88ms on average. Assuming that libGDX's Box2D implementation remains the same at ~75ms that means the performance gap has narrowed from 100% to under 20%. The variability of performance with the Monkey version is still higher, with spikes to >160ms where libGDX keeps it under 100ms but it's a much closer race now. Note that this is just a headline figure on a very collision/contact intensive example that is intentionally chosen for being slow on Android, performance in general is likely indistinguishable for the most part.
The performance improvements are significant enough to enable Monkey devs to target lower powered devices and/or create more physics intensive games. So, if you shelved something because the framerate wasn't quite there then it might be worth grabbing the newer module version and taking another look.
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