puppetlabs/puppet — pull request #2952 by keymone (2014-08-08 12:43:22+00:00)
Title: (PUP-3038) Cache search_directories

combined with #2951 performance gains are simply too good to ignore

same reasoning - installing new module or gem is rare-enough event to require a server reload

i'm not an expert in puppet codebase, maybe this diff can be done in safer way - there must be places where cache invalidation is enough to avoid server reloads.