We've already used Java8 before with GWT 2.7. The production builds are 
done with ANT script that specifies the maxmemory limit. We've had it at 1g 
and I tried 2g and even 4g but that didn't have noticeable effect on the 
build times.

  <target name="gwtc" depends="svn" description="GWT compile to JavaScript 
(production mode)">
    <java failonerror="true" fork="true" 
classname="com.google.gwt.dev.Compiler" maxmemory="1g">
      <classpath>
        <pathelement location="src"/>
        <path refid="project.class.path"/>
      </classpath>
      <arg line="-war"/>
      <arg value="war"/>
      <!-- Additional arguments like -style PRETTY or -logLevel DEBUG -->
      <arg line="${gwt.args}"/>
      <arg value="com.company.example"/>
    </java>
  </target>

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