for testing purposes only make your platforms a little bigger ( for easier play) and remove the "earthquake" effect to see if there are breaks in performance and instant lag. cause with the shaking ground is not easy to tell if its the effect itself or there is every 8 seconds a lag too like someone wrote before. i dont know if you understand i dont speak very good english. but for the perfomance issue i told you 58 fps stable and and smooth gameplay there's not reason to depressed. nice job
i tested your builds (from the first page)
the crosswalk build seems to run faster to me.
thl t6s smartphone 4.4.2 android quad core 854 x 480 res mali 400mp2 (2core gpu) stable 57-60 fps
pipo s1 tablet android 4.1 ( custom rom 4.2.2) rockchip 3066 dual core mali 400 mp4 (4core gpu) 800*480 res 52-72 fps
the non crosswalk build in the smartphone is the same 52-60
but in the tablet 15-34 fps (very laggy) i assume is the rockchip but its strange the game isnt so heavy from the assets point of view...cpu makes huge difference even when mali mp4 is more powerfull than mp2..