I found this blog to improve performance for upgrade from crm 4.0 to crm 2011. Where do we need to create these registry keys? On CRM web server or on CRM SQL Server.
http://blogs.msdn.com/b/crm/archive/2012/03/02/improved-upgrade-performance-in-ur6.aspx
HI satyaV,
you need to created those keys on the CRM web server.
Regards, Damian Sinay