Symptoms:  Logons take forever and you’ve collected an xbootmgr/WPR/xperf123/xperfui trace.  What GPO can it be?  Easy!

 

Open Windows Performance Analyzer from the Windows 8 ADK:

image

Open Said Offending Trace:

 

image

Expand…System Activity and then find the Generic Events, click and drag the windows so its under “Analysis” tab…

image

AR me eyes!  Relax, its ok, we’re going to bring some good order out of this chaos.  Click this button in the top right:

image

And no, I can’t draw straight lines….

This trace should now look like this:

 

image

Slide down on the Provider Name area until you locate “Microsoft-Windows-GroupPolicy”.  Right Click and select “Filter to selection:

image

 

Sanity ensues…Now click the Carrot on Task Name (right of Provider Name in the middle of the screenshot above:

Anyway, this view looks like this (still too busy):

image

Notice the diamonds at the top by the way?  Highlight WinStop on the top and it’ll take you to the bottom area for WinStop.  Observe when each one ends and also, look for the column CSEElapsed Time:

 

image

 

Because it took 360453 ms to complete:

Next expand the CSEExtension Name field

image

Easy as pie.