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Add documentation for the benchmark CLI utility
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|+bundle-benchmark(1) -- Display the time taken for each gem to be loaded|
|+`bundle benchmark` [group]|
|+This command loads all your required dependencies as per Bundler.setup, and|
|+displays the total time spent in requiring each gem and its dependencies.|
|+Use this command to track down problems with excessive boot time in your|
|+application, or to optimize specific groups in your Gemfile for fast setup.|
|+## GROUP OPTION|
|+To test the load times for gems in a specific group, pass the group as an|
|+argument to `bundle benchmark`. Omitting this option loads all dependencies|
|+in your Gemfile.|