As long as scirra keeps making money with the html5 exporter they won't really care about native exporters. It's a shame really... because the event editor is great but it's useless with a poor performance.
A lot of people complains about this issue, they just seems to ignore it.
They will you tell you that you have to optimize your game, which is true... you could gain some FPS per sec.
If you are really serious about game development you should learn other tools.
Every other popular engine has decent performance on mobile, except construct 2.