Log Name:      Microsoft-Windows-Diagnostics-Performance/Operational
Source:        Microsoft-Windows-Diagnostics-Performance
Date:          7/1/2013 4:39:56 PM
Event ID:      101
Task Category: Boot Performance Monitoring
Level:         Warning
Keywords:      Event Log
User:          LOCAL SERVICE
Computer:      Gaming
Description:
This application took longer than usual to start up, resulting in a performance degradation in the system startup process:
     File Name  : WWAHost.exe
     Friendly Name  : Microsoft WWA Host
     Version  : 6.2.9200.16384 (win8_rtm.120725-1247)
     Total Time  : 5188ms
     Degradation Time : 188ms
     Incident Time (UTC) : 2013-07-01T23:37:38.588754100Z
Event Xml:
<Event xmlns="
  <System>
    <Provider Name="Microsoft-Windows-Diagnostics-Performance" Guid="{CFC18EC0-96B1-4EBA-961B-622CAEE05B0A}" />
    <EventID>101</EventID>
    <Version>1</Version>
    <Level>3</Level>
    <Task>4002</Task>
    <Opcode>33</Opcode>
    <Keywords>0x8000000000010000</Keywords>
    <TimeCreated SystemTime="2013-07-01T23:39:56.425989000Z" />
    <EventRecordID>9</EventRecordID>
    <Correlation ActivityID="{F8CF6335-76B3-0004-4763-CFF8B376CE01}" />
    <Execution ProcessID="1448" ThreadID="3680" />
    <Channel>Microsoft-Windows-Diagnostics-Performance/Operational</Channel>
    <Computer>Gaming</Computer>
    <Security UserID="S-1-5-19" />
  </System>
  <EventData>
    <Data Name="StartTime">2013-07-01T23:37:38.588754100Z</Data>
    <Data Name="NameLength">12</Data>
    <Data Name="Name">WWAHost.exe</Data>
    <Data Name="FriendlyNameLength">19</Data>
    <Data Name="FriendlyName">Microsoft WWA Host</Data>
    <Data Name="VersionLength">38</Data>
    <Data Name="Version">6.2.9200.16384 (win8_rtm.120725-1247)</Data>
    <Data Name="TotalTime">5188</Data>
    <Data Name="DegradationTime">188</Data>
    <Data Name="PathLength">32</Data>
    <Data Name="Path">C:\Windows\System32\WWAHost.exe</Data>
    <Data Name="ProductNameLength">37</Data>
    <Data Name="ProductName">Microsoft Windows Operating System</Data>
    <Data Name="CompanyNameLength">22</Data>
    <Data Name="CompanyName">Microsoft Corporation</Data>
  </EventData>
</Event>

This is a performance log, it records startup time.