PM'd you my email. You can send me the capx if you want; if not, at least two arm builds with v10 crosswalk: one with WebGL renderer, one with Canvas2D. I'll give it a go and see what happens.
BTW, your test device is a good match for mine; different hardware, but the performance should be very close (CPU a little slower, GPU about the same, screen rez the same).
Your specs: http://www.gsmarena.com/samsung_i8190_g ... i-5033.php
Mine: http://www.lg.com/us/cell-phones/lg-L41 ... ifications
Here in the states, both would be considered 'low-end'; not impossible to develop for, but you do have to be more careful to optimize.
FYI, crosswalk is basically a special version of chrome which is packaged up with our C2 exports to run as apps. Unfortunately, chrome is still primarily a browser, and sometimes 'regressions' sneak thru that don't have much effect on browsing, but hit games hard.
It's getting better with time, and the C2 community has been very vocal on the chromium bug tracker. It helps that other major engines are starting to support webGL exports too (Unity, Unreal), which is bringing major developers into the same space as us.
Ultimately, this is the tradeoff we live with: efficient, rapid development / tricky exporting and opts.