What do you mean slow? Rossi sold a huge working e-cat to a mysterious military agent some time ago.
Plausibly, much more is happening out of public view. Nevertheless, although the military buyer has arrived at an evaluation of the Rossi device, there is no apparent slowdown in the funding and development of new models of conventional military and naval engines. This may be taken as an indication that, at best, LENR and ecats are only at the beginning of what will be a protracted period of development before practical devices and applications reach the market.