How to apply the patch for speeding up the awfully slow startup time of Ruby 1.9.2 scripts. This guide is for Mac OS X Snow Leopard.
First, install RVM:
bash < <(curl -s https://rvm.beginrescueend.com/install/rvm)
then add RVM to the last line of your /etc/bashrc:
[[ -s "/Users/minarik/.rvm/scripts/rvm" ]] && source "/Users/minarik/.rvm/scripts/rvm"
restart the Terminal
and make sure that RVM works:
rvm list
if you have the RVM version that says “~/.rvm/scripts/base: line 42: ~/.rvm/scripts/functions/bundler: No such file or directory”, then make this change to ~/.rvm/scripts/base:
@@ -39,7 +39,7 @@ -logging utility init cleanup env rvmrc install environment gemset db bundler +logging utility init cleanup env rvmrc install environment gemset db
download the speed patch for ruby 1.9.2 p180 stable:
curl https://raw.github.com/gist/1008945/7532898172cd9f03b4c0d0db145bc2440dcbb2f6 > /tmp/load180.patch
compile ruby with that patch:
rvm install ruby-1.9.2-p180 --patch /tmp/load180.patch
set just compiled ruby as a default:
rvm --default use 1.9.2
That’s it, enjoy 
