Inserts taking exponentially longer as table size grows

We have seen a strange situation with postgres 8.3.6 taking longer times fo=
r inserting a fixed amount of data.  The insertion time is increasing as th=
e data in the table is growing.  We tried to use COPY command but to no ava=
il.  The increase is also not linear.  Insert is one of the basic operation=
s.  I am surprised to run into it on a fairly well established platform.
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