Match-IT will always find the cheapest route through a schedule; i.e. when evaluating alternative materials, resources and purchases/sub-contracts.
Use of the URGENT flag forces Match-IT to change strategy to find the quickest route, but only when doing ASAP schedules. URGENT has no effect on JIT schedules. Note that (as has always been the case) if a JIT schedule fails, Match-IT will turn around and perform an ASAP schedule.