An original precise technique for measuring creep rate using a laser interferometer has been developed. This makes it possible to obtain information on creep kinetics at any point on the creep curve over wide ranges of temperatures and deformation values. Some regularities in the deformation kinetics of glassy polymers have been found. The relationships obtained between activation energy and activation volume, and cohesion energy confirm the intermolecular origin of the potential barriers to deformation. The possibilities of studying microplasticity in different materials, including brittle materials, have been demonstrated. On this basis, the Creep Rate Spectra (CRS) method is suggested as a low-frequency and high-resolution procedure for application in relaxation spectrometry.