I've made more tests. I've got two exactly the same notebooks HP ProBook 4730s. There is Windows 7 on the second. They are using the same wifi router. When I ping the same host using both of them in the same time, there is 0% of lost packets on Windows and 1%-9% of lost packets on my Ubuntu. If there is bigger number of lost packets, then I just got disconnected and I have to restart wifi.
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