A porter helped us save a lot of time last time we had to connect with luggage (as in we were travelling on two separate tickets, not the same record).

Something I have noticed at SJU is the security lines can vary between location. Last time we came in at the A area (by taxi) and it was a zoo, we walked all the way up to D (to check our bags) and that security area was nearly empty. (not that this would be a good strategy if pressed for time)