The problem with cycling is that powering up is the least efficient part of the cycle. So a fridge (or an air conditioner for that matter) that cycles frequent

The problem with cycling is that powering up is the least efficient part of the cycle. So a fridge (or an air conditioner for that matter) that cycles frequently is spending more time running in its least efficient mode. I'm not a fridge nerd either, but my understanding is that adding thermal mass to the fridge will reduce the heating spikes from things like opening the door which will reduce the frequency at which it cycles up. So you can make your fridge more efficient if you have the space to put big jugs of water in the fridge and big blocks of solid ice in the freezer. You might only save a buck that way, but if the space isn't being used for anything else you have nothing to lose.