Who first realised how fast electronic computers would calculate?

1938, the Zuse Z3 calculator ran at 10Hz.

1951 UNIVAC I could do 0.002 Million Instructions per Second (MIPS).

1961 IBM 7030 could do 1.2 MIPS.

1965 CDC 6600 could do 10 MIPS.

Who first predicted that computers would be millions of times faster than humans at calculations, and when?