```ruby
require 'rbconfig'

# ideas taken from: http://blog.headius.com/2010/03/jruby-startup-time-tips.html
Aruba.configure do |config|
  config.before :command do
    next unless RUBY_PLATFORM == 'java'

    # disable JIT since these processes are so short lived
    ENV['JRUBY_OPTS'] = "-X-C #{ENV['JRUBY_OPTS']}"

    # Faster startup for jruby
    ENV['JRUBY_OPTS'] = "--dev #{ENV['JRUBY_OPTS']}"

    # force jRuby to use client JVM for faster startup times
    ENV['JAVA_OPTS'] = "-d32 #{ENV['JAVA_OPTS']}" if RbConfig::CONFIG['host_os'] =~ /solaris|sunos/i
  end
end
```

Add those flags only if not already added
user
```ruby
require 'rbconfig'

# ideas taken from: http://blog.headius.com/2010/03/jruby-startup-time-tips.html
Aruba.configure do |config|
  config.before :command do
    next unless RUBY_PLATFORM == 'java'

    # disable JIT since these processes are so short lived
    ENV['JRUBY_OPTS'] = "-X-C #{ENV['JRUBY_OPTS']}" unless ENV['JRUBY_OPTS'].include? '-X-C'

    # Faster startup for jruby
    ENV['JRUBY_OPTS'] = "--dev #{ENV['JRUBY_OPTS']}"  unless ENV['JRUBY_OPTS'].include? '--dev'

    # force jRuby to use client JVM for faster startup times
    ENV['JAVA_OPTS'] = "-d32 #{ENV['JAVA_OPTS']}" if RbConfig::CONFIG['host_os'] =~ /solaris|sunos/i && !ENV['JAVA_OPTS'].include?('-d32')
  end
end
```
assistant