Poor performance when opening large files from Samba share using GFS2

Issue

Copying files of any size between Samba share and a local desktop gives very reasonable speeds. Opening/saving single/multiple photoshop/other files in Indesign is incredibly slow when accessed over Samba share residing on gfs2.
These tests were performed on a share, located on a gfs2 file system.
- Opening a 20MB PSD file with Photoshop, takes 20 seconds
- Opening a 20MB EPS file with Indesign, takes 10 minutes 20 seconds
- Opening THE SAME 20MB EPS file with Photoshop, takes 20 seconds.
These tests were performed on a share, located on a EXT3 file system.
- Opening a 20MB PSD file with Photoshop, takes 20 seconds
- Opening a 20MB EPS file with Indesign, takes 20 seconds
- Opening THE SAME 20MB EPS file with Photoshop, takes 20 seconds.

Red Hat Enterprise Linux Server 6 (RHEL6) with the Resilient Storage Add On
Red Hat Cluster Suite with 2 or more nodes
GFS2 file system providing file shares
Highly-Available Samba (using ctdb) sharing out from GFS2 file system
- There is some network latency between clients (eg. Microsoft Windows workstations) and server (clustered Samba GFS2 cluster).
- This issue is easily visible with network latency of 20ms round-trip.

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