Naoya Sugioka’s tmpfs port is now ready to go.  It’s still considered experimental, but it’s worth trying.  tmpfs(5) is different because it keeps data in RAM once, and pages out only when needed.  This best-case scenario is an improvement to mount_mfs(8) and md(4), its predecessors.

It’s running now on pkgbox64 and already seems to be speeding up the bulk build process.