trace Slow WindowsUpdate with xperf

Install the Windows Performance Toolkit (http://social.technet.microsoft.com/wiki/contents/articles/4847.install-the-windows-performance-toolkit-wpt.aspx) (the Windows 8.1 version also works for Windows 7).

Now copy those commands in an empty .CMD file and run the CMD (as admin):

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xperf -on BASE+LATENCY+DISPATCHER+FILE_IO+FILENAME+FOOTPRINT+VIRT_ALLOC+MEMINFO+VAMAP+REFSET+MEMINFO_WS -stackwalk profile+CSwitch+ReadyThread+ProcessCreate+FileCreate+FileCleanup+FileClose+FileRead+FileWrite+VirtualAlloc+VirtualFree -buffersize 2048 -MaxFile 2048 -FileMode Circular -f C:\Kernel.etl
xperf -start UserLogger -on Microsoft-Windows-WindowsUpdateClient:::'stack'+Microsoft-Windows-Shell-Shwebsvc:::'stack' -BufferSize 2048 -f C:\User.etl

timeout -1

xperf -stop
xperf -stop UserLogger

xperf -merge C:\User.etl C:\kernel.etl C:\SlowWU.etl -compress

del C:\user.etl
del C:\kernel.etl
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If you have captured 5 minutes of the Windows Update slowness, press a key to stop tracing.

Compress the SlowWU.etl as 7z/RAR (to reduce the size), upload it (Onedrive, Dropbox) and paste a link here.