Tim Noonan is on a blog-posting roll. Not long ago, he did quite a bit of work to get better performance in Visual Studio when dealing with large numbers of pending changes, among other things. Much of the performance improvements came from better use of the ListView: inserting initial items and setting checked states.
He's also posted a preview of new review command features that will be available in the next release of tfpt (Team Foundation Power Toys). The current release is available in the VS March CTP SDK.