I didn't realize you were talking about preview, gr. 

I have trouble recognizing when people are asking/talking about preview. I hardly ever use texture shaded preview any more. I use wire frame almost all the time. My complex shaders all show up in preview as solid white, for the most part, and texture shaded view is utterly useless. Optimizing it in various ways is an alien concept to me now. Preview, to me, is all about position - lining things up.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)