After cloning https://github.com/wildfly/wildfly, if you import all 130 projects as Maven projects, the CDI nature is automatically added via an m2e configurator.

52 minutes after the import, the workspace is currently building at 81% and counting. Random jstack calls show most of the time is spent in the CDI Builder, as shown on the progress bar.

If I import the same projects in Luna (haven't tried on an clean KeplerEE distro yet) without CDI support (and admittedly the bulk of JBT), import+build complete in ~12/13 min