Re: Why is Elisp slow?

[Ergus]

On Fri, May 03, 2019 at 03:44:17PM +0300, Eli Zaretskii wrote:
> > From: ????????? <pcr910303@icloud.com>
> > Date: Fri, 3 May 2019 20:52:06 +0900
> > Cc: help-gnu-emacs@gnu.org
> >
> > * Guile (which is a scheme) has a radically different syntax with elisp (which 
> > means that to implement elisp in guile, one has to hack the byte code 
> > interpreter AFAIK). Elisp can be implemented inside CL with full compatibility, 
> > which mitigates lots of problems between interfacing between CL code and elisp 
> > code.
>
> This is not a problem with Guile, because Guile includes a compiler
> and interpreter for Emacs Lisp.
Hi Eli, now I am the curious.

If that's already done (which sems to be the harder part), where is the
real problem to migrate to guile? I know there should be many, but what
are the known ones??