Public bug reported:

Binary package hint: ruby

The Ruby package is compiled with the --enable-pthreads option. This has
been known to drastically slow down the interpreter by ~ 50%. The effect
of this is that Ruby on Windows outperforms Ruby on Ubuntu.

--enable-pthreads is generally not used within the Ruby community.

http://antoniocangiano.com/2008/12/10/reflections-on-the-ruby-shootout/

** Affects: ruby-defaults (Ubuntu)
     Importance: Undecided
         Status: New

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ruby is slow because of --enable-pthreads
https://bugs.launchpad.net/bugs/307462
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