Apache Portable Runtime and Tomcat

I noticed when starting RTC Server with Tomcat a warning message: "The
Apache Tomcat Native library which allows optimal performance in
production environments was not found on the java.library.path"

Investigating little bit on the web I found this Apache Tomcat URL:
http://tomcat.apache.org/tomcat-5.5-doc/apr.html where it is explained.

My question is, have you seen an interesting performance improvement
using it in your RTC installations? In which scenarios?

Thanks in advance,

Chemi.