reduce legacy precip runtime
reduce legacy precip runtime

Cut code segment from 18 to 3 minutes thanks to some better code
akrherz/dep,akrherz/dep,akrherz/dep,akrherz/idep,akrherz/idep,akrherz/idep,akrherz/dep,akrherz/dep,akrherz/idep,akrherz/idep,akrherz/idep