"Caffeine provides 50 percent fresher results for web searches than our last index, and it's the largest collection of web content we've offered. Whether it's a news story, a blog or a forum post, you can now find links to relevant content much sooner after it is published than was possible ever before."
To refresh the old system Google re-analyzed the entirety of its cache. This created a lag in the results. With Caffeine, they say, they now analyze the web continuously in small portions, updating the search index as they go.
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