Performance Related features for migration from .net 2003 Framework 1.1 to .net 2008 framework 3.5?

I am work on VB.net 2003 Framework 1.1 for last 3.5 years in windows Application. We are currently migrating to VB.net 2008 framework开发者_StackOverflow中文版 3.5, but i don't know about the features which related to ADO.net and which is important to performance. I know linq to SQL but our architecture is made in .net 2003 so we should follow this. Any features which is very important to enhance the performance?

I've done about 5 migrations with pure ADO.NET from 2003 to 2005.
Performance was exactly the same or better for me.
Only some big projects were a bit slower to design in visual studio (ie. typed datasets/forms)..

Improvements for ADO :

• SQLBulkCopy. Possibility to bulk-insert data into tables. example
• Faster datasets article

You might be able to get some performance improvements using generics, but that would require a bit of code change. I think generics a lot are enough reason to move from .NET 1.x to 2.0 and Linq is a good reason to move from 2.0 to 3.5 and up.