EXPERT RESPONSE
In my experience odbc is not "slow by default." When investigating performance issues in distributed environment working with db2/400, I almost always found that the slow part was SQL proccessing on the database (i.e. because of a missing index) and not the ODC layer. So I would advise you not to discontinue ODBC use that easily.
That being said, an alternative can be the ado.net provider that works very well (and is supposed to be slightly faster then ODBC). It is offered by iSeries Access and more details can be found here.
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