You can read about it in the URL below, but I’ve had it running for over two years as the linchpin of a Perl-based CMS that The ASF used to use itself (under prefork).
It screams under HTTP2. See https://sunstarsys.com/CMS/ -- Joe Schaefer, Ph.D. <j...@sunstarsys.com> 954.253.3732 <//954.253.3732>