Rails 3.1 is very slow in development-mode because of assets, what to do?

Question

After I added Sprockets, Rails is loading very slow in development mode, what should I do to speed it up?

Answer 1

Take a look at https://github.com/wavii/rails-dev-tweaks.

Rails is running all of the to_prepare hooks on every Sprockets asset request in development mode. This includes things like auto-(re)loading your code, and various gems sneak work in there too.

rails-dev-tweaks disables to_prepare & reloading on any asset request (and a few others - read the first part of its README). Speeds up your dev environment by a huge amount for any decently sized project. It's also configurable to do this for any additional requests you like