> 20,000 items Takes on average 0.078seconds/room
> 385,000 items Takes on average .11seconds/room
> 690,000 items takes on average .270seconds/room
> 1,028,000 items Takes on average .475seconds/room
>
> As can be seen the time taken to process each room increases. A commit
> occurs when a room has been copied.
It probably isn't the insert that is getting slower, but a select.
Foreign keys to growing tables will exhibit this behaviour.
Since the time is doubling with the number of items, you might want to
check for a SELECT working with a sequential scan rather than an index
scan.