Actually, I believe the "performance" in the NATS medical has no effect on the speed of your course allocation. Everyone follows the normal procedure of being sent to an ordered pool with all the people who have passed the selection process. Then it is a bit of first-come first-served, taking into account course preference, personal circumstances,... Waiting times of at least 2-3 months have been pretty standard recently (fom what I know anyway, correct me if wrong).