Re: What's missing in ELisp that makes people want to use cl-lib?

[Dmitry Gutov]

On 11/11/2023 20:07, Gerd Möllmann wrote:
> Seq is 10 years in Emacs, its polymorphism is unused in the tree. Joao
> showed that it's slow. Dmitry mentioned that it is not a full
> replacement for what is in cl-lib.

FWIW, it doesn't seem to me that seq's dynamic dispatch is the main part 
of what makes it "slow" in a number of cases. cl-lib is not that 
well-optimized either.

Just recently (https://debbugs.gnu.org/66806#23) we tested both 
cl-set-difference and seq-difference, and the hand-rolled version was 
much faster.

I think both of these libs could use more performance-oriented 
contributions, and for most other uses (data structures smaller than in 
that example) their speed is largely comparable.