Indications :
Network slow in vista, Accessing network shares are very slow
Copying network shares in vista computer is slow or stopped.
Resolving computer or network resource names with DNS taking time or not working.
and some more……
Reason :
This is because of some new network functions in Vista. Microsoft tried some different technology in vista network to make things easy, but finally it failed. It is not a common problem for all vista computers, if your computer has latest service packs, patches and hot fixes, you may not face these above problems.
Solution:
There are lot of articles, hot fixes and tough ways to solve these type of network problems in vista, but before try them, first run the following commands. it will solve your most of the network issues with Vista.
Open command prompt as Administrator ( Right Click and select Run as Administrator),
Network slow in Vista – Part 2
Type,
Netsh interface tcp set global autotuning=disabled
This will disable the autotuning function in vista TCP/IP networking, which will help you to solve most of the problems.
To see the result of the command, you can type,
Netsh interface tcp show global
Use one more command as administrator,
Type,
Netsh interface tcp set global rss=disabled
By using above two commands ( autotuning and rss), you can solve some of the network issues in Vista. To make these two settings again to the default setting, you can use following commands,
Netsh interface tcp set global rss=enabled
settings again to the default setting, you can use following commands
Netsh interface tcp set global autotuning=normal
Find more on Network slow in Vista forum
very useful, fixed my issue.