Does TPC-H SF1 really take _one and a half hours_ for you on regular Postgres? Last time I tried (in the form of DBT-3), it was 22 queries and most of them ran in a couple seconds.
Edit: I seemingly don't have these benchmarks anymore, and I'm not going to re-run them now, but I found a very (_very_) roughly similar SF10 run clocking in around seven minutes total. So that's the order of magnitude I would be expecting, given ten times as much data.