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From: P R Keeble <csuml@yahoo.codotuk>
Newsgroups: comp.lang.ada
Subject: Re: fastest data structure
Date: Thu, 12 Dec 2002 12:40:06 +0000 (UTC)
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>   Since you seem to be focused on optimizing, I would like to quote
>   from 
> Meiler Page-Jones "The Practical Guide to Structured Systems Design"
> (an old book, but may of the principles still hold).
> 
>   Jackson gives two rules for determining when to optimize:
>     1. Don't do it.
>     2. Don't do it yet.
>   Optimize only the parts of a system worth optimizing.  One of the
>   old 
> systems
>   proverbs, the 90-10 rule, says: In a typical application, 90 percent
>   of 
> the total
>   run time is devoted to executing only 10 percent of the code.
> 
>   With the added corrolaries (I can't quote the source):
>   It's easier to optimize a working system than it is to make an
>   optimized 
> system work.
> 
> Steve
> (The Duck)
> 

And Knuth will add to that "Premature optimisation is the root of all 
evil".

Can't say I agree its the reason my mother still cooks but it's 
reasponsible for everything else!