FYI, it didn't seem like there was much of anything to do/buy once you go through pre-clearance (us customs) in DUB.

I was a bit surprised by this, since It was my first time in DUB (gooo wideroe!).

We also took the 747bus (cheap and close) and got there like 2.5 hours early and it was super empty in security and pre-clearance, but I've heard in the summer it can get rather busy...