Performance is such a tricky area for Ruby. Folks outside the Ruby community happily malign its performance, fueled by both FUD and by some truths. Folks within the Ruby community either aren't affected by Ruby's performance (it's "fast enough") or they simply don't care (it's slow, but I still love it too much to leave). A small part of the Ruby community takes what is in my opinion a rather anti-Ruby stance: "write it in C" as a targeted solution for identified bottlenecks. I suppose reality lies somewhere inbetween all these views, with Ruby's performance certainly not being stellar in the general case, but reasonable and sometimes surprisingly good for specific cases.
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