slow building index and reference after Sybase to Pg

Hi,

I'm testing on converting a big Sybase db to Pg.  It took about 45 hours
to convert all sybase tables (bcp) to Pg (copy) without index and
reference.  After that I built the index (one by one, sequentially) and
it took about 25 hours and then I started to add the references (one by
one), however, it has been more than 30 hours and still has no sign of
finishing. I wonder, is there any suggestion that may speed up the index
and reference building (on Pg).

Thanks,
Gary