one question, if you were to play the game in your phone's browser by using preview on LAN or dropbox, does it play at the same FPS? what's the difference?
reason I ask is because the game that I'm working on hasn't been tested as a native app yet, only in phone browsers where it's too slow. and since I haven't built it yet with PhoneGap I'm hoping it gains some speed when I do. did build it with appMobi and it was like 2FPS :(
it will play slightly faster, but not too much. if it's 2fps in appmobi, i wouldn't expect more on phonegap, optimize your game graphics, remember that mobile phones have poor hardware, dont use particles, big sprites, lots of animations. watch out for sprite resizing and changing their angle.
I think that everything will be much better when Construct 2 will total support AppMobi and mainly the "AppMobi Direct Canvas Accelerates". So let's ask Ashley to make this possible.
You can see this page that say how much the improvement is possible...it's just fabulous:s I recall, direct canvas only works on ios devices, the android DC was scheduled to 1Q2012 but isnt available yet.