Instead of compiling one permutation at a time, there is an option to compile multiple permutations at the same time by mutli-process.
Here is the parameter I used in the Ant build.xml file (sorry, I don't use maven), all you needed to add -localWorkers within gwtc target tag: <target name="gwtc" depends="javac" description="GWT compile to JavaScript (production mode)"> <java failonerror="true" fork="true" classname="com.google.gwt.dev.Compiler"> <classpath> <pathelement location="src" /> <path refid="project.class.path" /> <pathelement location="C:/gwt-2.5.0.rc1/validation-api-1.0.0.GA.jar" /> <pathelement location="C:/gwt-2.5.0.rc1/validation-api-1.0.0.GA-sources.jar" /> </classpath> <!-- add jvmarg -Xss16M or similar if you see a StackOverflowError --> <!-- <jvmarg value="-Xmx256M"/> --> <jvmarg value="-Xmx1024M" /> <arg line="-war" /> <arg value="war" /> <!-- Additional arguments like -style PRETTY or -logLevel DEBUG --> <arg line="${gwt.args}" /> <!-- Number of process to compile --> <arg value="-localWorkers" /> <arg value="2" /> <arg value="-optimize" /> <arg value="9" /> <arg value="-strict" /> <!-- <arg value="-XenableClosureCompiler" /> --> <arg value="mta.itrac.Itrac" /> </java> </target> -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/hhytunHdDYsJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.