NFS Performance issues on Oracle Linux 6.7: Shared libraries on NFS slow down system

BTW, be careful using soft mounts:

With soft-mounted filesystems, you have to worry about damaging data due to incomplete writes, losing access to the text segment of a swapped process, and making soft-mounted filesystems more tolerant of variances in server response time.

To guarantee data integrity, all filesystems mounted read-write should be hard-mounted.

Soft mount issues

Using hard,intr is recommended on all NFS mounted file systems.

Do you use fs-cache or nscd on your CentOS 6.6 installation? Can you post a ps ax of both machines, as well the output of /proc/mounts/ ?