Postgres 7.3.2 -> 8.1.2 upgrade performance issue

Hi,

Recently tried an upgrade from 7.3.2 to 8.1.2.  The actual upgrade went
pretty well.  However my application is now getting >10 times slower
INSERT times than it was under 7.3.2.  As far as possible I mirrored the
settings in postgresql.conf (obviously I couldn't just drop in the old
config).

Any thoughts as to where to look, or what to do to fix this?

Thanks,

David.