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**Subject**: **Re: Is 70ms 14 or 12% faster than 80ms ?**
**From**: Albert Chan <albertmcchan@...>
**Date**: Tue, 15 May 2018 16:53:15 -0400

> speed = 1/70= (100% + %faster)(1/80)
> %faster = 80/70 - 100% = 14.3%
Just want to add:
% faster should only be use for small percentage
Bruce Dawson recommend around 20%
https://randomascii.wordpress.com/2018/02/04/what-we-talk-about-when-we-talk-about-performance/
We don't say 100% faster, we say twice as fast
-- the number is bigger, good for marketing
-- using speed ratio is unambiguous (faster if ratio > 1)
-- work well even if code run slower, say 0.96X
-- trivial to calculate
speed vs oldest version = 1.143 * 0.96 = 1.097X