slow web access in oversea location

My company's web site load very slow in some countries and always end with timeout.  I RDP to a friends PC and found a lot of http 407 error when accessing my company's web site.  Access to other web site in my region is normal and fewer http 407 error.  

Wireshark show the TCP window size is 64K when access my web site.  Comparing other success web sites, their window size is 490 with calculated window size 15680 and scaling factor 32.

Is window size can affect web performance and what should I tune - Cisco router or the NIC of the web server?

Can anyone guide me how to change the window size?
verygreen_hkSystem ProgrammerAsked:
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asavenerCommented:
You're seeing proxy authentication errors?

Sounds like an issue with the ISP or the country of origin.

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giltjrCommented:
Window size should not matter that much, in fact the "further" away the bigger the window size should be to help performance.

As asavener stated, you need to look at the Proxy authentication errors.

You also need to see what the latency and packet loss are.

The higher the packet loss the slower the page will take to load.

Latency, window size, and bandwidth are all related.  The higher the latency, the higher the bandwidth, the larger the window size needs to be to keep traffic flowing smoothly.

Available bandwidth will vary depending on how much traffic is flowing over each and ever link between the two end points.
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