see my slides: https://speakerdeck.com/samsaffron/why-ruby-2-dot-1-excites-me on...

		sams99 on Feb 24, 2014 \| parent \| context \| favorite \| on: Ruby 2.1.1 is released and Ruby turns 21 see my slides: https://speakerdeck.com/samsaffron/why-ruby-2-dot-1-excites-... only perf related feature is: RUBY_GC_OLDOBJECT_LIMIT_FACTOR ... you can set it to 1.5 to heavily reduce RSS usage of 2.1