In ODBC standard there's an option called SQL_ATTR_PARAMSET_SIZE
The ETL tool will name this option differently. If you turn on ODBC tracing, you should spot this there. Otherwise, this feature is not turned on.
I tested DataDirect 6.0 + Informatica 8.6, the insert performance is under 100 rows/sec, which is very disappointing.
The network latency between ETL client host and TD server is about 1.5ms.
But other RDBMS can achieve 20K~60K rows/sec insert rate via DataDirect ODBC driver.
Just some information