It's very slow to access file server after installed SP1 of Win7.

Question

I found it's become very slow to access shared files on file server after installed win7 SP1, (windows6.1-KB976932-X86.exe),  access same file, the win7 without sp1 is fast in 5 secs, but the pc with sp1 need more than 30 secs. And
I tried to removed the sp1, everything goes fine, access fast as others.
I don't understand what's the reason and which feature affected it, I believe the sp1 can help Win7 be more safety, but why the performance on it get worse.
And I didn't find the same question or tips on forum or website, do you really haven't the issue?
Arnold From Shanghai, China
Arnold Yu

Answer 1

Hi Arnold,
Windows 7 Service pack and any other Windows Updates are released to improve the performance, reliability and security of the system.
Firstly please run the performance troubleshooter:
Open the Performance troubleshooter
http://windows.microsoft.com/en-US/windows7/Open-the-Performance-troubleshooter
If it doesn't resolve the issue, Put the computer in
Clean Boot and then check to see if the issue persists.
If it still persists, please use performance monitor to trace your computer's performance:
Performance Monitoring Getting Started Guide
http://technet.microsoft.com/en-us/library/dd744567(v=ws.10).aspx
Karen Hu
TechNet Community Support