Once a seething cauldron of competition, the twice-yearly Top500 listing of the world’s most powerful supercomputers has grown nearly stagnant of late.

In the most recent Top500 compilation, released Monday, the Chinese National University of Defense Technology’s Tianhe-2 has retained its position as the world’s fastest system, for the fourth time in a row.

Tianhe-2 is no more powerful than when it debuted atop the Top500 in June 2013: In a Linpack benchmark, it steamed along offering 33.86 petaflop/s of computing power. A petaflop is one quadrillion floating point operations.

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