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https://issues.apache.org/jira/browse/LOG4NET-421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13890797#comment-13890797
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Tom Voros commented on LOG4NET-421:
-----------------------------------
This issue may impact versions 1.2.11 and 1.2.12 as well. I couldn't find
LOG4NET-205 in the release notes to confirm.
> Inclusion of UserName in composite properties dictionary has a significant
> performance impact
> ---------------------------------------------------------------------------------------------
>
> Key: LOG4NET-421
> URL: https://issues.apache.org/jira/browse/LOG4NET-421
> Project: Log4net
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.2.13
> Environment: Issue was observed on Windows Server 2008 R2 with an
> ASP.NET 4.0 application.
> Reporter: Tom Voros
> Labels: performance
>
> A change made for LOG4NET-205 has the LoggingEvent.CreateCompositeProperties
> method get the UserName property for every log event. Since getting the
> UserName is very slow, this change has a significant impact on performance in
> log4net.
> In one trace captured with dotTrace on a large web application we found that
> the get UserName property (called from CreateCompositeProperties) accounted
> for 34% of all time spent in log4net code.
> Our workaround for the issue has been to "fix" the UserName property by
> adding <fix value="32" /> to all our appenders.
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