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If Google crawls 1,000 pages/day, Googlebot crawling many dupe content pages may slow down indexing of a large site. In that scenario, do you recommend blocking dupes using robots.txt or is using Meta Robots noindex,nofollow a better alternative?

Google's Matt Cutts answers:

Official Google Answer

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Answered: 10 March 2010. Views: 1,021.

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