title: Rails [3.1.0.rc1] webrick freeze on http 500 error
body: <p>since I installed rails 3.1.0, when some bugs occur, Webrick freezes for a couple of minutes when some bugs occur (not all bugs, apparently the 500 ones).</p>
  
  <p>My gemfile looks like this:</p>
  
  <pre><code>source 'http://rubygems.org'
  
  gem "rails", "3.1.0.rc1"
  
  #Asset template engines
  gem 'sass'
  gem 'coffee-script'
  gem 'uglifier'
  gem 'jquery-rails'
  
  gem "simple-navigation"
  gem 'ranked-model' #, :git =&gt; 'git@github.com:harvesthq/ranked-model.git'
  gem 'formtastic'
  gem 'validation_reflection'
  gem "paperclip", "~&gt; 2.3"
  gem 'devise'
  gem 'heroku'
  gem "aws-s3"
  gem "scoped_search"
  gem "meta_search", :git =&gt; 'git://github.com/ernie/meta_search.git'
  gem "kaminari"
  
  group :production do
    gem "pg", "~&gt; 0.11.0"
    gem 'therubyracer-heroku', '0.8.1.pre3'
    gem 'exception_notification', :require =&gt; 'exception_notifier'
  end
  
  group :development, :test do
    gem 'mysql2'
  end
  
  require 'csv'
  </code></pre>
  
  <p>I'm on Mac OS X 10.6.7.</p>
  
  <p>Can anyone help me on this? Thanks,</p>
  
  <p>Nicolas</p>