The thirdparty webdav-servlet-2.0.jar library which is dependency of modeshape-web-jcr-webdav contains log4j.xml
which logs with TRACE level to a file with fixed path.

If log4j reads this file then application logging on such level agressively consumes CPU, IO, disk space.
This is very critical problem for production environments. This file shouldn't be bundled with libraries.

The problem was fixed by library authors
http://webdav-servlet.svn.sourceforge.net/viewvc/webdav-servlet?revision=82&view=revision
but there are no further releases containing above change.