In one of the app, as the codebase grew larger and larger, it was becoming pain in ass to navigate the site from browser. Takes around 20 to 30 secs to complete a single request. This was guiding towards frustration for the developer team to develop the app.
So, I started to find out on how to boost the speed. Googled almost with every keyword on speeding up the rails dev environment but to no avail. While still searching around I came to this gem/plugin https://github.com/thedarkone /rails-dev-boost and it changed everything.
Now the app is much more snappier and this was like a God sent one. It supports Rails version 3.0, 2.x But I’ve tested this on Rails 3.0.3 app.