Fileshare Speed Problems

Hi!

One of my customer is using Fileshare under Windows 7 and Windows 2012 Server and have big Problems with the fileshare System..

Under Windows XP and Windows 2003 there where no Speed Problems...

The Compiler Directives that he is using was:
FILESHARE CALLFH "EXTFH"

In the cobopt.cfg is standing:
set environment_mapper=TRUE

Have anyone a hint for me to bring up the Speed for the programs?

Here an select Cobol sample:
              SELECT    TITEL
                              ASSIGN external TITELX
                              ACCESS          DYNAMIC
                              RECORD KEY      TI00
                              ALTERNATE RECORD KEY ti900 duplicates
                              ORGANIZATION    INDEXED
                              LOCK MODE MANUAL
                              FILE STATUS     STTITEL.

...

And the FD:
       FD  TITEL
           DATA RECORD RTITEL.
      *
       01  RTITEL.
           02 TI00.
      *                                       * MASTER KEY
              05 TI000        PIC 999.

I hope anyone can help me and my customer!?

Best Regards

Bernd