Web Server supports the Java Security Manager. The main drawback of running the Security Manager is that it negatively impacts performance. The Java Security Manager is disabled by default when you install the product. Running the Web Server without the Security Manager might improve performance significantly for some types of applications. Based on your application and deployment needs, you should evaluate whether to run the Web Server with or without the Security Manager. For more information, see Sun Java System Web Server 7.0 Update 3 Developer’s Guide to Java Web Applications.