Thanks for your reply.
---> You should update to a more current minor release.
Recently I updated to 9.1.5. I will do in near future.
--> You need to provide more information on how you backed up, how you
are restoring, and what the bottleneck seems to be.
I am pg_restore using for restoring the backup which created using pg_dump.
Thanks in Advance
Regards
Ramana