Hi Nicolas,
Thank you for posting question.
From your post, my understanding on this issue is: A performance issue was
encountered when double click a excel file on mapped drive. If you try to
open it by Office Excel manually, it works fine. If I'm off base, please
feel free to let me know.
Before moving on, could you please help us confirm following points?
1. Can you please let us know the version of Office? 2003 PRO
2. Do you use a VBScript logon script to map drive? no i made it manually
3. If you manually map a drive in CMD, does the issue occurs? yes
4. If you access the net share by UNC, does the issue occurs? yes
Based on my known, if VBScript logon script includes a trailing backslash
"\" character in the namespace folder name can cause similar problem.
Could
you please check it if you are using VBScript logon?
Regarding the documentation on the open file process, I found the
following
information from "Whitepaper: Improving Network Performance when users
access Office XP and Office 2003 Documents"
--------------------------------------------------------
The Office file format is not optimized for WAN. The Office file format
requires more frequent and smaller data blocks going across the network.
It
is best to avoid opening and editing Office files over a WAN for two
reasons: potential data loss and increased IStream interface calls. With
Office files, especially Word files, there is a generation of many IStream
interface calls. The IStream interface lets you read and write data to
stream objects. Stream objects contain the data in a structured storage
object, where storage provides the structure. Simple data can be written
directly to a stream but, most frequently, streams are elements nested
within a storage object. They are similar to standard files.
Saving Word documents across a wide area network can appear to be
significantly slower than across a local area network, and the amount of
data that is transferred when users save documents across a WAN can be
much
larger than the file size on disk. Up to 2.5 times as much data can be
transferred across the network, compared to the original file size on
disk.
This is normal and expected when users save Word documents across a
network. The difference can be explained by the additional data transfers
that are required to help Word maintain secure access and to support
certain Word features.
--------------------------------------------------------
For more information, please refer to the following link:
Whitepaper: Improving Network Performance when users access Office XP and
Office 2003 Documents
http://office.microsoft.com/en-us/help/HA102177991033.aspx
Hope it helps.
Best regards,
Robinson Zhang
Microsoft Online Support