Reduce concurrency per worker to half.
Reduce concurrency per worker to half.

johngian/mozillians,akatsoulas/mozillians,mozilla/mozillians,akatsoulas/mozillians,johngian/mozillians,mozilla/mozillians,mozilla/mozillians,johngian/mozillians,mozilla/mozillians,akatsoulas/mozillians,akatsoulas/mozillians,johngian/mozillians