  We extend the technique of multiplex coherent Raman spectroscopy with two
femtosecond mode-locked lasers to oscillators of a pulse repetition frequency
of 1 GHz. We demonstrate spectra of liquids, which span 1100 cm$^{-1}$ of Raman
shifts. At a resolution of 6 cm$^{-1}$, their measurement time may be as short
as 5 microseconds for a refresh rate of 2 kHz. The waiting period between
acquisitions is improved ten-fold compared to previous experiments with two
lasers of 100-MHz repetition frequencies.
