Vi giro un'informazione interessante per chi ha qualche nuova TWS con il SP3:
SUBJECT: Possible performance issue with Windows XP Pro SP3
Affected Software: NX 5, NX 6
Associated PR Number(s): None
Scope: Windows XP Pro, SP3
Revision: None

There is a difference in the read ahead buffer on SP3 (4kB), compared with SP2 (32kB). This is the only remarkable difference in the communication of SP2 and SP3 and could be the reason for the observed performance issue
with SP3 in place. This should only be happen in case of on oplock break situation.

The general workflow of both systems is quite similar during assembling the data. The workstation enumerates the directory contents, opens the ptr file and reads in the required data on different offsets of the file.

The following registry entry has been introduced to control the ReadAhead size:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Servic es\LanmanWorkStation\Parameters

Value name: ReadAheadGranularity
Data type: REG_DWORD
Value data: Number of pages to read ahead. The valid range is 0 to 16. The
default setting is 8 pages (32 KB).

The ReadAhead feature is disabled if hotfix 894463 is installed.
Therefore, you must manually enter the ReadAheadGranularity registry entry. To do this, following these steps:

1. Click Start, click Run, type regedit , and then click OK.

2. Locate and then right-click the following registry subkey:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Servic es\LanmanWorkStation\Para

3. On the Edit menu, point to New, and then click DWORD Value.

4. Type ReadAheadGranularity , and then press ENTER.

5. On the Edit menu, click Modify.

6. Click Decimal, type 8 in the Value data box, and then click OK.

Note There are few scenarios where you may have to modify the
ReadAheadGranularity registry entry . For example, you may have to change
this setting on a lossy WAN link or a heavily loaded Terminal server to a
setting of 4 ( this setting equals a 16-KB read size).
Typically, when Windows reads large files sequentially, the program
performs better if the program posts larger read sizes.