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:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

You're seeing proxy authentication errors?

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

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
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.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.