Everyone is forgetting that each of the example sites is also fast, even eBay. That counts for a lot in return-ability. One of the amazing things about Google

Everyone is forgetting that each of the example sites is also fast, even eBay. That counts for a lot in return-ability. One of the amazing things about Google in the early days was how damn fast it returned results. It was easily 2-3x faster than the competition at first, or at least appeared to be so.