Oracle 10G 64bit to SQL 2008 64bit is very slow

I am running SQL 2008 64bit on a Windows 2008 64bit server. I installed the Oracle 10.2.0.4 w2k8 / vista 64 bit client and selected the "Admin" option. I also installed Oracle SQL Developer on the MSSQL box. I am noticing significant performance issues with the Oracle linked server from within MSSQL. In MSSQL I am using the Oracle Provider for OLE DB (OraOLEDB.Oracle) and the Data Source is pulling from TNSNames. I setup SQL Developer connections as "Basic". When I run this query (SELECT DISTINCT <column> FROM <table>) from Oracle SQL Developer the data returns in just over 1 seconds (1.007). When I run the same query in MSSQL as "SELECT DISTINCT <column> FROM <linked server>..<Schema>.<table>) from MSSQL it takes 26 seconds to get the data back. I have the "Allow inprocess" option enabled.
Does anyone know how to fix this problem?

I did find that the <server>..<schema>.<table> syntax does not always perform remote execution. To force MSSQL to run remote execution you have to use their OPENQUERY procedure. This requires embedding PL/SQL within the T-SQL code so that everything passes from Microsoft to Oracle. It also complicates even the simplest queries.

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