instantaneous efficiency not so instant

so i just upgraded from an fx to a dsrx. on the fx, "instantaneous efficiency" was actually that, a gauge that told you how much you're pulling out of your battery in this *instant*. like, you yank the throttle, the number jumps into the hundreds, you let go it drops to zero.

on the dsrx it's more... gooey? it feels like an average over about a minute or so. it slowly creeps up and down, but is never actually instantaneous.

is there a setting i'm not seeing? does "instant' not mean the same thing across models? i get it cypher3 is a different beast, would love to pick other users' brains before i start a conversation with zero.