I've been working on shadow map LOD. I've got a system set up that creates a few large and lots of small render target textures (72 in all, about 100MB) and it looks good. My problem is that the first time a new RT comes into effect there is a very large hitch in rendering. There is no problem after that; it only happens on the first use.

All of the RTs are initialised when the game loads. What else am I supposed to be doing?

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