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Tianhe-1A, developed by China's National University of Defense Technology, was the world's fastest supercomputer in 2010 when it was unveiled. It could perform 2.5 quadrillion calculations per second. However, supercomputing rankings change frequently - Japan's K Computer and later systems from the US and China have since claimed the top spot. The question appears to be from around 2010-2011 when Tianhe-1A held the record.