Indeed - I may have just stumbled on a busy day (it was a Sunday), but the amount of people transferring from the Domestic to International terminal with only 1 bus shuttle, it meant it took a considerable time in the queue to make it onto the bus!
If you manage to transfer quicker than I did, security did say that check-in only opened at 10am and won't let me inside the terminal prior to that, but with a boarding pass in hand you maybe waved through earlier - just an fyi.