From: Torimus NA <lists@...>
Date: 2013-05-06T06:47:07+09:00
Subject: Re: Slow ruby 2.0.0-p0 under Ubuntu 13.04

This is a known issue of rbenv. It cripples compiler flags, so the 
interpreter may run code about 400% slower.

To get rid of this behaviour pass CFLAGS to installation with rbenv 
tool.
For example to instal Ruby 2.0.0 the command may look like

CFLAGS="-O3 -march=native" rbenv install 2.0.0-p0

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