Backup Exec 2012 VMDK restore from tape is too slow (33mb/min)

Hi, anyone else is facing this issue when backup Exec 2012 SP4 restores a full vmdk (not GRT) from tape?

Issues:

a) We had to redirect the restore directly to the Esx instead of thru vCenter due to creating vm process takes 5 hours to complete

b) After redirecting restore to the Esx, the restore could progress however est time to complete restore of 700GB vmdk = 15 days.