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What Happens in This Subphase
The ExplorerInit subphase begins when Explorer.exe starts. During ExplorerInit, the system creates the desktop window manager (DWM) process, which initializes the desktop and displays it for the first time.
This phase is CPU intensive. The initialization of DWM and desktop occurs in the foreground, while in the background the service control manager (SCM) starts services and the memory manager prefetches code and data. On most systems ExplorerInit is CPU bound, and timing issues are likely the result of a simple resource bottleneck.
ExplorerInit begins just before the desktop appears for the first time. There is no clear visual cue to indicate the end of ExplorerInit.
ExplorerInit Performance Analysis
Applications—such as antivirus programs or application servers—that are created during service start in this or previous phases can consume CPU resources during ExplorerInit. Some services might not be started yet when ExplorerInit is complete.
So if the ExplorerInit phase takes too long, make sure you minimize the services which use a lot of CPU power and make sure your AV Tool doesn't hurt too much. If it doesn't change the tool and try a different.
The PostBoot Phase
What Happens in This Phase
The PostBoot phase includes all background activity that occurs after the desktop is ready. The user can interact with the desktop, but the system might still be starting services, tray icons, and application code in the background.
Specifically, Xperf samples the system every 100 ms during the PostBoot phase. If the system is 80-percent or more idle (excluding low-priority CPU and disk activity) at the time of the sample, Xperf considers the system to be “idle” for that 100 ms interval. The phase persists until the system accumulates 10 seconds of idle time.
Note: When you review traces and report timing results, you should subtract the 10 second idle time that accumulated during PostBoot to determine total boot time.
There are no explicit visual cues for PostBoot. The phase begins after the user’s desktop appears and ends after satisfying the 10-second metric that was explained earlier.
PostBoot Performance Vulnerabilities
During PostBoot, Windows examines the entries in the various Run and RunOnce keys (Run, RunOnce, RunOnceEx, RunServices, and so on) in the registry and the Startup folder in the file system, and then starts the listed applications.
If post boot takes too long, reduce the number of running applications at startup with the help of msconfig.exe or AutoRuns.
When you have a HDD (no SSD!) and you want to speedup the boot, run the optimization from this guide:
Analyses of the shutdown trace:
The shutdown is divided into this 3 parts:
To generate an XML summary of shutdown, use the -a shutdown action with Xperf:
xperf /tti -i shutdown_BASE+CSWITCH+DRIVERS+POWER_1.etl -o summary_shutdown.xml -a shutdown