Haven't done a dyno run with it on/off .. but i don't think it's constant. When i've had it on in the past, i've been accelerating with my right foot in the same position, and then i feel it cut slightly.
So i believe it's a little smarter than that.
I think i read somewhere too that when you start hitting high rpms, the
ECU cuts it too. Either way though, you always feel a difference when you have it turned on.
I reckon it steaks somewhere around 10kwatw.