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Google Yahoo etc. use economies of scale.
You can't search 5 billion pages in 0.02 seconds on 1 server. The query is split over the whole network, distributed processing.
It takes the same total computer power to handle 200 million queries a day, but by using parallel processing you get the results 1000 times quicker. Each server tackles under a million web pages.
10 million pages is about the limit for a single server search engine.
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