cxf-xjc-plugin really slow

[Delany]

Hi,
I'm attempting to replace maven-jaxb2-plugin with cxf-xjc-plugin (v3.3.1).

The documentation on this plugin is a single page
https://cxf.apache.org/cxf-xjc-plugin.html
There seems to be undocumented option <xsdDir>
I've got a directory with 128 schemas so obviously don't want to use <xsd>

            <execution>
              <id>xjc</id>
              <goals>
                <goal>xsdtojava</goal>
              </goals>
              <phase>none</phase>
              <configuration>

<sourceRoot>${project.build.directory}/generated-sources</sourceRoot>
                <xsdOptions>
                  <xsdOption>
                    <extensionArgs>-Xinheritance</extensionArgs>
                    <extension>true</extension>

<xsdDir>${project.basedir}/src/main/resources/xsd</xsdDir>
                  </xsdOption>
                </xsdOptions>
                <extensions>

<extension>org.jvnet.jaxb2_commons:jaxb2-basics:${dep.org.jvnet.jaxb2_commons.jaxb2-basics}</extension>
                </extensions>
              </configuration>
            </execution>

Using the maven-jaxb2-plugin the project takes 10s to build. With
cxf-xjc-plugin is takes 96s. What's going on?

Thanks,
Delany