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#11
I think you should give it some time and a few restarts, say a day or two.
In my case, installing 7057 caused hardware interrupts CPU usage, which other builds didn't, but after it downloaded all the Windows Updates and I had all the necessary drivers installed, this was solved.
However, since build 7000 , 7022 and 7048 didn't cause this performace loss, you still have a point...