NEB Turbo cells grow fast not only on plates (colonies visible after 6.5 hours), but also in liquid medium. In a flask shaking at 37°C, NEB Turbo cells reach O.D.600 6.0 after 6 hours of growth. Under the same conditions, DH5α cells reach O.D.600 2.3. When tested in a fermentor, results were comparable. (see Figure on NEB #C2984 product page).