I have been working hard to keep the draw call number has low as possible, although I have noticed that creating a hud with a lot of text makes the draw call spike, exactly every text added, adds 2 draw calls (the text itself and the ui that has to pick up from last z sort).
This means that if you have a XP bar, with A level number, gold and some other type of currency, in the hud, you are already at 10 draw calls. With no TextFields, its only 1 draw call.
Is there anyway around this besides not using a TextField?
Now this is especially a problem on iPad3, since I noticed that at around 30 drawCalls the framerate start dropping below 20 fps (assuming that there is only 1 2048x2048 texture in memory and some TextFields floating around).