Find slow loading gems in your Bundler-based projects!

Bumbler tracks how long the main require of each gem takes, for example with gem 'bar' it tracks require 'bar'. If the gem name and the require name are different, add require: manually for correct time tracking, for example gem 'bar-foo', require: 'bar_foo'. This require tracking can sometimes lead to false positives, because of dependencies, for example foo requires rails which leads to foo being marked as slow.

For rails projects it loads config/environment.rb, for all others it runs Bundler.require *Bundler.groups.

gem install bumbler
cd project && bumbler

Add bumbler to your Gemfile

gem 'bumbler'

RUBYOPT=-rbumbler/go bundle exec ruby -r./lib/foo.rb -e Bumbler::Stats.print_slow_items

Set the minimum number of milliseconds before something slow is listed. For example, to show anything >= 10ms:

bumbler -t 10

See how slow your app's initializers are (./config/initializers/*), as well as the initializers for any engines you rely on.

bumbler --initializers

Rails:

bumbler --all

Ruby:

-e Bumbler::Stats.print_tracked_items

We don't have any integration tests with rails, so when touching rails code make sure to test it in a real app.

cd my-rails-app && ~/Code/tools/bumbler/bin/bumbler

rake bump:[major|minor|patch] && rake release

Bumbler is MIT licensed. See the accompanying file for the full text.