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Your issue is due to the sub-query. There are two problems with this: MySQL does not know how to project the outer queries predicates, limits etc. to the inner query, so the inner query ends up being fully materialized ( and then, as a second step, filtered based upon the outer queries. (http://dev.mysql.com/doc/refman/5.6/en/subquery-optimization.html) ...


I don't see it stated anywhere as to what version of the .NET Framework is being used, but given that this question was asked in May of 2014, and .NET Framework version 4.5 came out on 2012-08-15, the following note on SqlConnection.ConnectionString for the Asynchronous Processing / Async keyword seems relevant: This property is ignored beginning in .NET ...

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