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.NET provider vs. ODBC

Hello.
 
We have some performance issue on Teradata DB. Select with 36 columns return approx. 10000 rows:
- .NET provider, TdDataReader ... 7:17 minutes,
- ODBC, DbReader ... 4:26 minutes.
 
Is it expected result? Or is any "known issue" in .NET provider when using reader?
 
P.

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