I noticed that Amazon has (relatively) recently changed their results pages so that it preloads the first 4 results of the next page. When you click next, the n

I noticed that Amazon has (relatively) recently changed their results pages so that it preloads the first 4 results of the next page. When you click next, the next 4 results show immediately, and then the rest of the results start loading. I wonder how many hundreds of thousands of dollars that small change is earning them...