I Believe at the conference they said that the performance problem tends to reflect poorly in the .DBC. Since we are being herded (? .spl) like sheep into using the .dbc for validation rules among other features. It looks like they are once again comprimising additional functionality for perfromance.
Terry Rooks
Software Systems Architect
Microsoft Certified Solution Developer.Net
If at first you don't succeed, then skydiving definitely isn't for you.