"Rapid transformation" refers to a process where something changes quickly and dramatically. It means a significant and swift change in a particular situation or condition. Full definition
It is indeed disturbing to see such rapid transformation of an important, productive system where we had no reason to suspect that was even possible. (dotearth.blogs.nytimes.com)
It is evident that journals in biomedical fields are undergoing rapid transformation from the traditional subscription models to open access models. (ivyspring.com)
But he cautions that genetic variation within the corn, wheat, rice or other plants may not be enough to enable such rapid transformation. (scientificamerican.com)