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>

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