Hello there,

I recently ran into the same (slowness) problem when viewing long threads.
After some profiling I found out that disabling indentation did the trick
for me. In my case it went from unusable (>5 minutes) to ~3 seconds for
large threads.

(setq notmuch-show-indent-content nil)

Hope it helps.

On Mon, Jan 21, 2019 at 9:07 AM Dan Čermák <dan.cermak@posteo.net> wrote:

> "Landry, Walter" <wlandry@caltech.edu> writes:
>
> > Dan Čermák <dan.cermak@posteo.net> writes:
> >
> >> Hi Landry,
> >>
> >> I am afraid this is a common limitation of emacs: if you start opening
> >> large files (especially with long lines) it becomes very slow.
> >>
> >> A viable workaround is to open the offending thread in the tree view
> >> (bound to 'z' by default) and then only view individual messages.
> >
> > Tree view works well [1].  Everything is fast, and I kind of prefer that
> > view anyway.
> >
> > Thanks,
> > Walter Landry
> >
> > [1] I have been using notmuch for almost a year, and I did not realize
> >     that there is a separate tree view.
>
> I have been using notmuch for about two years and iirc didn't realize
> tree view existed until about half a year ago. Should really have read
> the manual and all the key bindings at first.
>
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