SSIS package performance issue

Hello,

I have a SSIS package performance issue.

Since we migrated from a less powerful server with SQL Server 2005 to a more powerful machine with SQL Server 2008 R2 the loading time of our ssis package increased dramatically from 1 h to 5 h.

The ssis package runs on a separate virtual 32-bit SQL 2008 Server. In the package I only changed the connection manager settings of the destination database:

Oracle -> SQL Server 2005 database (Old 64-bit server with 8 CPU and 8 GB RAM): Loading time is 1h

Oracle -> SQL Server 2008 R2 database (New 64-bit server with 24 CPU and 32 GB RAM): Loading time is 4-5h !!!

Where might be the bottleneck?

Oracle Client Configuration on the new server?

SQL Server Configuration on the server?

Thanks

Axel