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Since last August, you have been able to get Google Search results instantly, even before you are done typing your query. But, that's not enough. When you click on a result, you want that page to load instantly as well. If you don't search, but navigate directly to a web page from the address bar, that should load instantly too.
We have implemented prefetching in Chrome to make these possible. This experimental feature utilizes the time when you are thinking or typing to predict what you need next, and gets it ready for you ahead of time. It is a challenging problem. A wrong prediction makes ads and analytics accounting inaccurate, wastes client resources and increases server load. We discuss how we address these concerns.