Slow statement when using JDBC

I am running a statement with bind variable like the following:

<code>
PreparedStatement stmt = psqlConnection.prepareStatement("SELECT * FROM X
WHERE X.ID=?", ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
ResultSet rs = stmt.executeQuery();
</code>

This takes 30 seconds. On the other hand, if I run the following without
binding the id:
<code>
PreparedStatement stmt = psqlConnection.prepareStatement("SELECT * FROM X
WHERE X.ID=7", ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
ResultSet rs = stmt.executeQuery();
</code>

This runs in 230 ms.

I am using:
JDBC3 Postgresql Driver, Version 9.0-801 against a 9 postgres database.

Any ideas, Thanks in advance