Certainly you're technically correct about the 75% improvement in speed, but the units of speed for program execution is a little weird and unintuitive (Hz). I've not run across anyone who says "my program got faster! It went from 0.05 Hz to 0.08 Hz!". I think that's why people find it a little odd to talk about speed increase rather than time decrease.

On Sat, Jul 27, 2013 at 8:12 PM, torhu <no@spam.invalid> wrote:

On 26.07.2013 01:15, Leandro Lucarella wrote:

Walter Bright, el 25 de July a las 14:27 me escribiste:

On 7/25/2013 11:49 AM, Dmitry S wrote:
>I am also confused by the numbers. What I see at the end of the article is
>"21.56 seconds, and the latest development version does it in 12.19", which is
>really a 43% improvement. (Which is really great too.)

21.56/12.19 is 1.77, i.e. a >75% improvement in speed.

This is certainly misleading, is very easy to be confused with a time
reduction of 75%, which one would expect to be 1/4 of the original time.
:)

A doubling of the speed would be 100%, just saying.