Re: Why does adding a useless copy-sequence and discarding the result make my ELisp 40 times faster?

[Andreas Politz]

Clément Pit-Claudel <address@hidden> writes:

> On 2017-03-25 00:06, Clément Pit-Claudel wrote:
>> * Why does running additional, supposedly useless code speed things up so 
>> much? (1)
>
> Interestingly, it turns out that (copy-sequence) isn't needed:
> instead, it's enough to use (sleep-for 0.000001) (or even (sleep-for
> cl-least-positive-normalized-float)) to get the 40x speedup.

What about this explanation: If you make Emacs wait inside the loop, it
can send some of the strings immediately.  Otherwise, it'll have to
store them all/some in memory first.

-ap