Big Sprite on adreno200 problem

Big Sprite on adreno200 problem
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when I add several 1024x1024 png image to the scene it cause some problem on HTC Wildfire(Adreno200) but no problem on other device such as Galaxy S.
The problem is some sprites are not drawn, and frame rate fall to 10fps.
When I remove or invisible dose sprite, frame rate will back to normal.
In some condition it works fine with 5 sprites (1024x1024), and in some cases it have problem with 2!

So I don’t understand what is the problem?