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boot.ps1

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+#requires -version 4.0
+#requires -runasadministrator
+
+#Retrieving all events with ID 100
+
+$BootEvents = Get-WinEvent -FilterHashtable @{
+  logname='Microsoft-Windows-Diagnostics-Performance/Operational';
+  id=100}
+
+#Building a boot history with, for each boot, the duration of the boot process
+
+$BootHistory = $BootEvents | Select-Object TimeCreated, LevelDisplayName,
+        @{
+   n="BootStartTime";
+   e={Get-Date -Date (([xml]$_.ToXml()).Event.EventData.Data |
+  Where-Object {$_.name -eq "BootStartTime"})."#text"}
+  },
+        @{
+   n="BootEndTime";
+   e={Get-Date -Date (([xml]$_.ToXml()).Event.EventData.Data |
+  Where-Object {$_.name -eq "BootEndTime"})."#text"}
+  },
+        @{
+   n="MainPathBootTime";
+   e={([timespan]::FromMilliseconds((([xml]$_.ToXml()).Event.EventData.Data |
+  Where-Object {$_.name -eq "MainPathBootTime"})."#text"))}
+  },
+ @{
+   n="BootPostBootTime";
+   e={([timespan]::FromMilliseconds((([xml]$_.ToXml()).Event.EventData.Data |
+  Where-Object {$_.name -eq "BootPostBootTime"})."#text"))}
+  }
+
+$BootStartTime = $BootHistory.bootstarttime
+
+$MainPathBootTime = $BootHistory.MainPathBootTime
+
+$PostBootTime = $BootHistory.BootPostBootTime
+
+$LastBootDate = $BootStartTime | Select-Object -First 1
+
+$OldestRecordedBoot = $BootStartTime | Select-Object -last 1
+
+$BootFrequencyInDays = ($LastBootDate - $OldestRecordedBoot).days / $BootStartTime.Count
+
+$AvgMainBootDuration = [timespan]::FromSeconds((($MainPathBootTime.totalseconds |
+  Measure -A).average)).ToString("hh\:mm\:ss")
+
+$AvgPostBootDuration = [timespan]::FromSeconds((($PostBootTime.totalseconds |
+  Measure -A).average)).ToString("hh\:mm\:ss")
+
+$ActualWindowsBootTime = (Get-Date) - `
+  ([timespan]::FromMilliseconds([Math]::Abs([Environment]::TickCount)))
+
+$LastEvent12 = Get-WinEvent -FilterHashtable @{
+  LogName='System';
+  ProviderName='Microsoft-Windows-Kernel-General';
+  ID=12} -MaxEvents 1 | Select -ExpandProperty TimeCreated
+
+
+#Building an object containing a quick summary of your last computer boot, as
+#well as of the average boot duration.
+
+$BootInformation = 1 | Select-Object BootFrequencyInDays, AvgMainBootDuration, `
+   AvgPostBootDuration, LastBootDate, OldestRecordedBoot, `
+   ActualWindowsBootTime, LastEvent12
+$BootInformation.BootFrequencyInDays = $BootFrequencyInDays
+$BootInformation.AvgMainBootDuration = $AvgMainBootDuration
+$BootInformation.AvgPostBootDuration = $AvgPostBootDuration
+$BootInformation.LastBootDate = $LastBootDate
+$BootInformation.OldestRecordedBoot = $OldestRecordedBoot
+$BootInformation.ActualWindowsBootTime = $ActualWindowsBootTime
+$BootInformation.LastEvent12 = $LastEvent12
+
+#Grouping boot events by Level, in order to see if your computer boot duration is below or
+#beyond the thresholds defined in the Registry
+$BootAnalysis = Get-WinEvent -FilterHashtable @{
+  logname='Microsoft-Windows-Diagnostics-Performance/Operational';
+  id=100} |
+  Group-Object LevelDisplayName
+
+$BootHistory | Out-Gridview