When you run a rake task for a Rails 3 project, it has to load the entire environment since gems can include their own rake tasks. I started to get annoyed by this, because every capistrano deployment would load up rails on my environment just to notify hoptoad.
If you have a very simple rake task that is called very often, you might want to add some work-around code to check for it in the very beginning of your Rakefile. You might even want to bypass rake entirely, and put the code in a file in ./scripts.
Here is an example for way faster hoptoad notifications (this cut our deploy time in half):
# Speed up hoptoad:deploy by not loading rails environment if ARGV == "hoptoad:deploy" require 'active_support/core_ext/string' require 'hoptoad_notifier' require File.join(File.dirname(__FILE__), 'config', 'initializers', 'hoptoad') require 'hoptoad_tasks' HoptoadTasks.deploy(:rails_env => ENV['TO'], :scm_revision => ENV['REVISION'], :scm_repository => ENV['REPO'], :local_username => ENV['USER'], :api_key => ENV['API_KEY']) exit end
There are other ways to speed up rake, such as Rake Server (which forks a Rails server process each time you invoke a rake task).
But sometimes quick hacks just work best.