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Could network throughput be bottleneck in load testing?

I have made 4 times load testing for web portal, which located in the internet.
Each time load testing scenario is same, but number of virtual users are different.

Response time percentiles and response time per page looks reasonable. When number of users are incresed, there are moe waiting for end-users.

However,  as a network throughout I get 2MBit/Sec for all 4 tests.
Does this mean that network band is bottleneck and it twists results?

(Load testing sofware is Proxy Sniffer, but problem should be generic)
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Synocus
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Synocus
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Dk_guruCommented:
It looks to me like you've nailed the issue on the head.

Possible fixes (depending on where the 2MBit connect is) is add more pipes ie second and third internet connections or up your connection speed with the provider; again depending on where the bottleneck is, server side or your side....

If all the users are at the same location, then the bottle neck is probably that side, however is the users are at different locations, then the bottle neck is very likely the server side.

the third possibility that I see is that the system may not be able to efficiently process the data in a timely manner for the users meaning that the server may need upgraded to heftier hardware.

It may be a good idea to state your internet speeds on both sides and the server hardware and OS version.
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