Applies To

Windows Server 2008, Windows 7

Cause

Event ID 101 indicates an application is taking longer than usual to start up, resulting in
boot time degradation caused by a system startup process.

Details

While occasional degradation is normal due to software or hardware device driver updates,
if you determine that a particular device or application event is being logged on a regular basis or results in a continuation of boot time degradation, chances are that there is a problem.  Check with your hardware or software provider to obtain updated device drivers or software.
 
The Event Viewer in Windows Server 2008 and Windows 7 includes a new category of
event logs called Applications and Services Logs, which includes a host of Windows Performance Diagnostic subcategories which track information such as boot time, standby/hibernate and system shutdown.  The task category of boot performance spans the
events detailed below.

Boot Performance Events 100-110

Event ID	Cause
100	Windows has started up
101	This application took longer than usual to start up, resulting in a performance degradation in the system start up process.
102	This driver took longer to initialize, resulting in a performance degradation in the system start up process.
103	This startup service took longer than expected to start up, resulting in a performance degradation in the system start up process.
104
105
106	The background optimization operation took longer to complete.
107	The application of machine policy caused a slow down in the system start up process.
108	The application of user policy caused a slow down in the system start up process.
109	This device took longer to initialize, resulting in a performance degradation in the system start up process.
110	Session manager initialization caused a slow down in the startup process.

Resolution

Tools for Troubleshooting Slow Boots and Slow Logons
Investigate the root cause of devices or applications which impact slow system boot issues.

Using Windows Performance Analysis Tools
Windows Performance Tools are designed for analysis of a wide range of performance problems
including application start times, boot issues, deferred procedure calls and interrupt activity
(DPCs and ISRs), system responsiveness issues, application resource usage, and interrupt storms.

Related information

KB 977419 - Unexpectedly slow startup in Windows 7 or in Windows Server 2008 R2