check this
http://www.magnetismsolutions.com/blog.aspx/roshan-mehtas-blog/2012/05/04/dynamics_crm_2011_early_vs._late_binding_overview
http://social.microsoft.com/Forums/en-US/a22fc5e2-7acc-4054-a7ae-8aea65aebaf2/crm2011-early-binding-vs-late-binding-performance-view-point?forum=crmdevelopment
ms crm