  We analyze the static response to kinetic perturbations of nonequilibrium
steady states that can be modeled as diffusions. We demonstrate that kinetic
response is purely a nonequilibirum effect, measuring the degree to which the
Fluctuation-Dissipation Theorem is violated out of equilibrium. For driven
diffusions in a flat landscape, we further demonstrate that such response is
constrained by the strength of the nonequilibrium driving via quantitative
inequalities.
