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I'm trying to speed up my UIScrollView and one method I know of is to set everything to be opaque. I think I have done so, to my UIScrollView, its contentView, the contentView's tiledLayer (I have a CATiledLayer as the actual useful bit that the users see), and on the UIView that all of this sits in. But despite all of that when I look it through the Core Animation instrument with 'Color Blended Layers' turned on the scrollview's contents are shaded red showing they are transparent. The only green bits are outside the bounds of the contentview (which I can only see when it pans out to the side and then bounces back).

Is there something built in to ScrollViews, or CATiledLayers that could be ignoring 'setOpaque:' or have I messed up my view hierarchy and left something not-opaque?