The lazy route initialization cuts down boot time of rails.
On my local system it cuts out 200ms of boot time taking me from 3.2 to 3 seconds.
This is not a radically enormous amount of time, but paper cuts add up, and a faster boot in dev will make everyone happy.
TBD if we want to also include this in production.
Gem is heavily maintained by @amatsuda, last commit 3 days ago.