While restoring copy of SQL Server 2008 backup file in SQL Server 2008 R2 degraded performance I am trying to upgrade our SQL Server version from SQL Server 2008 to SQL Server 2008 R2. But when I restored a SQL Server 2008 backup file in SQL Server 2008 R2, it's significantly degraded the performance of stored procedures. I took a full back up from old SQL Server 2008 and restored it in new SQL Server 2008 R2. I checked the execution plan of several stored procedures to make sure no indexes are missing, but everything is same.

Can anyone please give me an advice about it if I need to do any further steps to get better performance on it?

Thanks,
Dony
The odds are that on the restore, it is appropriate to update statistics on the db. In many cases, this step alone will help.

If it does not help, it may be that index fragmentation crept up and became an issue now, though my $ is on statstics...