Opening Office Documents across WAN connection

I've been trying to solve a problem that I've been facing for quite sometime. We have a file server at (site 1 - 3MB/3MB bandwidth) I have another remote office (site 2 - 10MB/2MB bandwidth) both located within the United States. When a user opens an Office Document (100kb-150kb) from the file server at site 1 from site 2 it takes about 16 seconds to completely open and become usable/editable. If I simply do a file copy/transfer it happens within 1 second. I'm guessing opening the document across the WAN takes longer due to the application writing a temp file to the source directory of the file. (Guessing that's why it takes so long). We have document's at site 1 that we share with site 2 so this is becoming a problem. We use DFS to share directories across the WAN, but that doesn't solve all of our problems. As we have multiple users using the same file at the same time. (We have no ability to lock the file when it use - thus causing saving over one anothers changes).

Basically are there any tips, tricks or causes for Office Documents opening incredibly slow? Any help will be greatly appreciated.
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Keep the documents local or use VPN with RDP or VNC  to access a computer on the other side.

I hope this helps !

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rbmacctAuthor Commented:
Thanks. Not quite was I was looking for. Maybe I left out a piece of information. We have a site-to-site VPN established  between the two. Having the file locally isn't an option as where multiple user from both sites use the documents.

Then consider using remote desktop into a computer at the office where the docs are kept.

then all traffic is local.
 but you will need an extra PC per person.

Also check with the anti-virus disabled.

I hope this helps !
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Check your latency using ping between the sites. What is the average latency ?

rbmacctAuthor Commented:
Ping statistics for
    Packets: Sent = 37, Received = 36, Lost = 1 (2% loss),
Approximate round trip times in milli-seconds:
    Minimum = 71ms, Maximum = 191ms, Average = 134ms

The reason why things are so slow is high latency. Microsoft protocols are very latency sensitive.

Latency is a hard thing to battle. Using the same provider at the two offices can help. But latency is usually introduced by physical distance, so if the two offices are far apart, it may be difficult or impossible to lower latency.

Using Citrix or Remote desktop is a way to bypass the problem. Wan Accelerators are another possibility, but these are very expensive.

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