rlange - 6:51 pm on Aug 3, 2011 (gmt 0)
@pfui: I checked my setting (enable instant on the basics page) and it was off. Must say that I upgraded from a previous version too. Can't tell what a fresh install would be on.
I'm pretty sure that setting is for the "instant search results" feature, not the prefetching feature. The prefetching option is located in Under The Hood and is, I believe, "Predict network actions to improve page load performance".
Google needs to get their feature naming sorted out...