After dump/restoring from 32bit 8.4-windows to 64bit 9.2.4-linux experiencing 10x slowdown on queries

Hi,

I'm trying to upgrade our database server from postgresql 32-bit 8.2.4
running on Windows Server 2008 to postgresql 64-bit 9.2.4 on ubuntu server
12.04.02 LTS.

I have dumped one of our databases from our windows server and restored it
on the postgres server running on ubuntu in order to test for
incompatibilities. But the thing I am noticing playing with pgAdmin is that
queries are being performed much more slowly on the linux server compared
to the old windows 2k8 server, even with linux running on a ssd with more
ram, faster cpu etc.

I've tried running ANALYZE, VACUUM and combinations of these via pgAdmin on
the linux database but performing queries consistently take 10x the amount
of time that they take on the windows server so I'm obviously missing
something here.

The dump is a simple pg_dump -F c -f data.backup, then using pg_restore to
restore in an empty database created with template0. What could be causing
the new database to perform so abysmal?