On 26 January 2014 21:44, Eli Zaretskii <eliz@gnu.org> wrote:

> > Date: Sun, 26 Jan 2014 21:22:37 +0200
> > From: Bozhidar Batsov <bozhidar@batsov.com>
> > Cc: emacs-devel <emacs-devel@gnu.org>
> >
> > While we're at it - why not increase the default `gc-cons-threshold' as
> > well. Currently the default is 0.8 MB, which seems super-conservative
> given
> > today most computers have 1GB+ of memory. Code that creates a lot of
> > objects would obviously be impacted significantly, since GC would be
> > performed frequently. Setting it to something in between 10MB and 50MB
> > seems much more reasonable to me.
>
> Did you try that?  If not, please do.  In my experience, your
> suggestion has a downside: the GC indeed happens less frequently, but
> when it does, it takes an annoyingly long time.  I find it easier to
> tolerate many GCs that run to completion in less than a second, than
> to have a few GCs that take several seconds each.
>

I've tested the flx package https://github.com/lewang/flx suggestion to
bump the gc-threshold and
the package definitely started working noticeably faster.  I haven't
noticed particularly long GC pauses.
Hopefully when multi-thread support is implemented in a future version of
Emacs we'll get some parallel GC as well.