Rules of Optimization:
Rule 1: Don't do it.
Rule 2 (for experts only): Don't do it yet.
-- M.A. Jackson
More computing sins are committed in the name of efficiency (without necessarily achieving it) than for any other single reason - including blind stupidity.
-- W.A. Wulf
We should forget about small efficiencies, say about 97% of the time:
premature optimization is the root of all evil.
-- Donald Knuth
The best is the enemy of the good.