Why brakes of a virtual machine on a powerful server?

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You have a server filled with: Intel E3-1270v2, 512GB SSD, 32GB, Windows 7 64bit, 1Gbit. On this server installed VirtualBox and in it a bunch of identical machines running windows 7 32bit. Each dev to spin a simple script (python+selenium), through which the proxy connects to the same website(testing). Now to the point: when 5 running virtualnih CPU 10-20%, memory occupied 12 GB of the 32, the network 3-5 Mbps, but when you run 6 or more cars start major lag, the feeling that there is not enough network bandwidth, although this is clearly not the case, and proxies in sufficient numbers, so it is clearly not in them. Prompt, please, in what side to dig?
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Check the network iperf'ohms. This can not be that slow backend?
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Why brakes of a virtual machine on a powerful server?
Why guess? Measure the load on the server and once it becomes clear.

with 5 running virtualnih CPU 10-20%, memory occupied 12 GB of the 32, the network 3-5 Mbps, but when you run 6 or more cars start moving the
Well, there is disk.

Each dev to spin a simple script (python+selenium), through which the proxy connects to the same website(testing)
And what prevents you to run hundreds of scripts in a virtual machine? How to fence a virtual reality for one script this is too much.
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Real Jedi have long used the headless browsers.
Read and stop trying to generate new path for each sneeze.
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