For at least a few days now, quick answer appears to have got a lot slower than it used to be. Search results appear quickly, but then the quick answer (triggered with ?) takes several seconds to appear. While I've not timed it, I'm sure it's a lot slower than it used to be, given I always found it quick previously/never noticed having to wait, but now it's taking long enough for me to wonder if it is even working at all until it appears.
Expect quick answer to appear only slightly behind search results.