Network Latency...

Dear Experts,

Please help me sorting this problem out as I am not sure what's caused it and how to resolve it.  First off, our environment... Windows 2008 DC's single domain, and Windows 7 Professional clients via a bonded T-1 MPLS between the sites... a DC is located at each site.  The problem is some time, most of the time...for a few users that it take them a while...  some time up to 3 minutes to logon or open a file locally or from a file server at another site.  Please advise.  Thanks.
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swgitIT ProfessionalAsked:
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TemodyPickalbatros, IT ManagerCommented:
sound like a virus
did you have this problem in the site or only some pc`s
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swgitIT ProfessionalAuthor Commented:
sometimes it's affecting the whole site... other times, it's just a few PC's.  I ran virus scan, removed un-necessary start-up processes, etc.... still can't see an improvement...
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TemodyPickalbatros, IT ManagerCommented:
Please try this  free application and full scan pcs on that site
https://www.malwarebytes.org

Very important to analyze your network traffic to determine exactly what's going on
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Bryant SchaperCommented:
are you sure you are not saturating the T1's?  3mbps is not a lot of bandwidth depending on what the users are doing.  Carrier probably has tools assist as well, if your router doesnt
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madunixCommented:
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MiffanweeCommented:
how many clients?
What Group Policies are being applied / replicated?
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swgitIT ProfessionalAuthor Commented:
Thank you for your suggestions and tools.  I contacted our MPLS and FW, they did some tests... rebooted the routers... and suggested some of the network monitoring tools... as well as suggesting to test the connections at each device along the way and determine which cause the slowness...
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