Not really. This is how the iPhone works. If you scroll through the scroll, all resources are used to make the scroll very smooth, due to the lack of new parts. Perhaps you can fool the browser by thinking that this layer is larger by increasing its size and adding a layer on top of the part that you do not want to show, but this does not work for all layouts. I will just leave it. Users are used for this, since regular pages have the same "rendering problem".
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