Now that I've disabled page curl and stack, I'm getting much better performance--faster page turns, font size adjustments, and brightness changes, as well as navigation (jumping chapters, or jumping between text and endnotes). Also, long-presses are more reliable and more responsive. The impact is probably more dramatic on my Nook Color than on many devices, both because it lacks power and because I'm using an unofficial Ice Cream Sandwich ROM that lacks hardware video acceleration.
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