How to get the actual 1.9.3 performance speed up now (in 1.9.2-p180):

http://www.rubyinside.com/get-edge-ruby-faster-loading-ruby-...

Xavier's awesome patch was somewhat usurped by a scrappier, yet still effective, one by the core team. I did an investigation and analysis of the story:

http://www.rubyinside.com/ruby-1-9-3-faster-loading-times-re...