How to reduce DB restore hrs

Hi,

            We are facing some slower DB restoration in one of the production Server. Is there any best method, where we can to reduce DB restoration ?

Let me give overview :

1. Our database size is 8 TB;  We are taking a split backup, which is run 2 hrs (Split backup 12 files + Verify restore only) and files store in local drive.
2. To restore 4 TB backup files in Server B, it runs 14 to 15 hrs, which is too long in terms of recovery / emergency situation.

Server Overview:

SQL Server 2008 R2 – Enterprise edition.

DB : Simple recovery model

Ram : 1 TB

Server - DL980 (fast track architecture)

Thanks,

Dhanapal