Turning off the transparency will only have great effect on large sprites like the one used for the background.
Do you sync it manually like this ?
update(0)
Render2DFront()
swap()
This is the fastest way to sync 2d in agk.
You should try to delete the shapes on all sprites that dont nead them like background and sprites that dont nead collision checks.
You could also try to disable the clear color screen command.
Cheers.
Android 2.3 , ZTE Skate , 480x800 , 800 mhz , Samsung Galaxy Y , 240x320 , 832 mhz , Sony ericson arc 480x854 , 1 ghz
Android 4.0 , Dmtech 3g 9738B , 1024x768 , 9.7 inches , 1.2 ghz