One of our clients on SQL 2005 Standard Server and Windows 2008 R2 has reported extreme application slowness since Windows Update Automatically applied security updates last week. It seems every time our application queries the SQL server, a 3-5 second pause occurs before a response is returned. During the query response delay, the lsass.exe (Local Security Authority) Process momentarily spikes in CPU utilization.

We noticed it occurred right after a series of windows updates were applied to the server. Because they were numerous, we removed 3 updates at a time and rebooted to see if one of the Windows Updates was to blame. After removing the 3rd group and rebooting, the SQL performance returned to normal. We are not sure which update caused it, but know it had to be one of these 3:

Security Update for Microsoft Windows (KB2992611)

Security Update for Microsoft Windows (KB2993958)

Security Update for Microsoft Windows (KB3002885)

We are extremely concerned as we expect more clients to be affected by this as these updates get pushed out. Please help!