An exaFLOP is 1,000,000,000,000,000,000 (a million trillion, or one quintillion) floating point operations per second. The world's top supercomputers are now reaching this speed, which is a 1,000-fold improvement over a petaFLOP machine.
The growth of computing power had followed an exponential trend for many years. However, a slowdown in the rate of progress was observed during the second half of the 2010s. It had earlier been predicted that exaFLOP machines would arrive by the end of the decade, but this schedule appeared to slip as technical and funding issues were encountered.