Microsoft has now released an update to solve a problem introduced by KB4041995…
After installing security update 4041995 or any other recent update that includes srv2.sys, CPU usage may spike up to 100% when you perform any type of SMB activity, such as copying files over the network. The problem is especially likely to occur if the computer only has a single-core CPU.
The standalone package is available from here: http://www.catalog.update.microsoft.com/search.aspx?q=4088874
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