Is there a way of turning off the screenshot previews? I don't particularly need it all the time and I'd imagine it stresses the engine a bit more than spitting things out in text-based, list format.
Google tested a similar "view a screenshot of the search result" feature a while back. You'd hover over a result and it'd show the screenshot in a column to the right. For whatever it's worth, they axed it, although I don't know the reasons why.
Also Google is notorious for putting out half-baked prototypes and quickly abandoning them, so it might very well be that the concept does better with a more dedicated team. I'm going to give this a shot for a few days and see how it is.
I get that it's trying to be different, but it's going against what the users are trying to accomplish. Would be interesting running tests on this for certain query types getting certain layouts, etc. Anyway, good luck!