A 90 minute connection arriving around 0820 is very likely to turn into about 15 minutes in the lounge max (if you are lucky) before you have to board your next flight

In order to smooth the process, you should keep a very close eye out for any staff members waiting at the jet bridges with your name or flight/destination who will either rush you through to the next gate if you are in danger of missing the connection, or to deal with their already organised misconnect arrangements. If there is no one there, then I would briskly get through security and to the next gate area (or if you are in Concourse A, then you are lucky as you board through the lounge).

Be warned that in the event of a bus gate they will board the flight relatively early, and you may want to be at the gate at the displayed time in order to ensure you get the J bus, not the Y bus