Win 7 Pro 64 bit very slow opening netowrk shares and copying files to/from network shares
Posted on 2010-09-16
I just purchased two new laptops running Windows 7 Pro 64 bit edition. I setup one of the two machines and joined it to the domain. The domain has several Windows Server 2003 boxes for file sharing, application services, and backup. It wasn't long before I noticed very poor network performance. Logging into the domain was slow. File copies barely moved at all. I setup a series of tests. Using a two year old WinXP Pro laptop I timed a file copy from the network share to the local drive of the XP laptop. The 1GB file copy completed in under 3 minutes. The same copy on the Win7 machine ran over 30 minutes before I canceled it.
The laptop sits in a docking bay using the dociking bay NIC. I undocked the laptop and plugged int the onboard NIC and tried the same copy. Still very slow. I disabled Symantec Endpoint Protection and tried the copy. Still very slow. I logged in with the domain admin account and tried the copy. Still very slow. Each time I tried to do the copy, windows spent a long time "discovering" the contents of the folder I was trying to copy.
Finally I had a breakthrough. I logged onto the WIN7 computer with a LOCAL USER ACCOUNT. Then I opened a window to the network share. At that point I authenticated to access the network share using the domain administrator account. This time when I did the test copy it finished in under 3 minutes. Interestingly the file copy worked instantly like the XP box. There was no delay "discovering" the contents of the share.
So, the problem seems to be with copying when logged on to the domain account versus logging on with a local account first,. Now I just need to figure out how to fix this so I get good speed logged onto the domain.
I did all this troubleshooting yesterday and "slept on it" last night. The only thing I thought of was disableing IPV6 on the Win7 laptop since it is not bound on the Server 2003 system. This morning I did some research and found some info regarding Remote Differential Compression. When I get to the office I intend to test both of these. In the meantime, if you have experience with this problem or suggestions, I'd greatly appreciate the help.