From: "Pavel R." <pavel.rosputko@...>
Date: 2010-12-22T18:56:02+09:00
Subject: Re: Regexp, String, Symbol literals' object_ids

> What kind of "problem" are going to need do so many packs/unpacks that
> this part (constant or string) will make much difference?

Working with binary protocols. Smth. like 
https://github.com/pavelrosputko/em-oscar/blob/master/em-oscar/icbm.rb

Much difference? Actually not so much in icbm.rb source above.

But one wrote at http://redmine.ruby-lang.org/issues/show/4184#note-3

I've been able to get 2-3% improvements in Rails apps by simply 
rewriting some 'constant's and inline Arrays as CONSTANTs.

I have patches to MRI that use cached, immutable Strings for the 
internal #to_s messages on immutable objects; e.g. changing Symbol#to_s, 
Float#to_s, Bignum#to_s, Rational#to_s, etc. to return the same frozen 
String instance.  I measured 1-6% performance improvement in the 
standard MRI tests.

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