The asymptotic rate of convergence of fully-immersed 2DOF milling process at the parameter points (a) Ω = 5000 and w = 0.00001 m (stable operation), (b) Ω = 20,000 and w = 0.00001 m (stable operation) and (c) Ω = 20,000 and w = 0.0001 m (unstable operation). It is seen that partial averaging does not diminish rate of convergence much. It is also seen that PTRMPA is always slightly more convergent than FTRMPA and thus advocated.