I definitely also have this problem with large threads - big time hangs
using Notmuch in Emacs. My simple tests indicate that it happens in Emacs,
not using Notmuch at the command line, though that can also take quite a
long time to return.

I'm suspicious that there's something with HTML parsing - does that seem
possible? It might also make sense if Delta Chat is giving you HTML versus
plaintext.



On Thu, Jun 3, 2021 at 12:55 AM Alan Schmitt <alan.schmitt@polytechnique.org>
wrote:

> Hello,
>
> On 2021-06-02 09:18, David Bremner <david@tethera.net> writes:
>
> > The code I posted worked fine for me for one message from a thread of
> > 323 messages.
>
> The thread that used to crash (before your patch) was from DeltaChat,
> which is an email-based chat app. The thread it produces are like lists
> more than trees. So I guess the depth of the tree is what matters.
>
> Best,
>
> Alan
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