Moose has a very large and slow test suite and it has been tested by me outside gentoo on a regular basis to be safe under parallel testing. So enabling parallel testing would be rather helpful for this package.
+ 28 Sep 2014; Mikle Kolyada <zlogene@gentoo.org> Moose-2.60.400-r1.ebuild: + Switch to parallel testing, thanks to Kent Fredric (bug #523944) +