This object is now the fastest thing humans ever made

The relativistic correction for GPS satellites is a combination of their relative velocity and general relativistic effects because they are farther away from the Earth. These work opposite to each other; relative velocity alone would cause their clocks to appear to run slower than a clock on the surface of the Earth, but altitude alone would make their clocks appear to run faster. The general relativistic effect actually dominates, the GPS clocks run 45 microseconds per day faster due to their altitude, but 7 microseconds slower due to their velocity, for an overall difference of 38 microseconds per day.