SetCustomDatum and setObject performance

I'm using the Object-Relational features of Oracle 8i. I've been experiencing a performance problem with setCustomDatum() or setObject() to set a user defined object in an OraclePreparedStatement to insert the object into the database.
The performance of setCustomDatum (or setObject) ranges from 10 milli-seconds to 2.2 seconds depending on the particular user defined object type being used in the insert.
I'm using Oracle 8.1.6 on NT and I've experienced the same problem with both the thin JDBC 8.1.6.0.1 driver and the OCI 8.1.6.0.1 driver. I'm using JDK 1.2.2-001.
Any help/hints would be gratefully appreciated.
Thanks,
Tom Marjoram

I can't believe that I'm the first person in this discussion group to use a Java Object that implements the CustomDatum interface in a prepared JDBC statement to insert that Object into the database.
Does anyone know why setCustomDatum or setObject might take such a long time when doing this. We have seen timings of up to 10 seconds for some complex objects. Does anyone have any insights into what might be going on here or how we might work around the problem ?
Has anyone else taken this approach to inserting Objects into the Object-Relational database and not had this problem ?
Again any help would be appreciated !
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