Your tests may be slowed down by initdb more than anything. If you specify "initdb -N", it will skip the fsync at the end of initdb. You can also turn off fsyn

Your tests may be slowed down by initdb more than anything. If you specify "initdb -N", it will skip the fsync at the end of initdb. You can also turn off fsync in postgresql.conf to stop fsyncs for transactions/checkpoints.