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  Closing the loop: CPU spike in winlogon.exe
Time: 02:37 EST/07:37 GMT | News Source: Microsoft | Posted By: Kenneth van Surksum

We recently dealt with an interesting issue that I would like to share, hope you enjoy. - Jason

Issue Summary

Customer reports that within their Citrix server farm (running on Windows Server 2003), when a user logs into or out of a session (seems more pronounced on logoff), ALL users connected to the server experience a ~5-20 second hang. The hang is described as follows:

  • Application in the session (i.e. Outlook and Word) stop accepting keyboard input. When the hang subsides, the typed characters show up all at once.
  • If applications are moved, they do not redraw
  • Cannot click the start menu
  • If the user was running performance monitor (in an attempt to diagnose), there would be a gap in the perfmon data that directly correlated to the hang duration

Customer has found that during the timeframe of the hang, Winlogon.exe (in session 0) is showing 25% CPU usage.

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#851 By 4240821 (185.214.74.118) at 4/6/2026 10:31:17 PM
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