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From: David Bremner <david@tethera.net>
To: Peter Salazar <cycleofsong@gmail.com>, notmuch@notmuchmail.org
Subject: Re: notmuch-mode very slow in emacs-mac-port (railwaycat)
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 <CAE+_6TzhEz5OSOCcWmRiiphdmz4QPpWy=ditbkFd8WDm-HeHbQ@mail.gmail.com>
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Date: Mon, 24 Aug 2015 14:44:32 -0300
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Peter Salazar <cycleofsong@gmail.com> writes:

> I run Emacs on Mac OSX, and I'm trying to switch from Emacs for Mac OSX
> <http://emacsformacosx.com/> to Emacs Mac Port
> <https://github.com/railwaycat/emacs-mac-port>.
>
> I use (notmuch)[http://notmuchmail.org/emacstips/] for email. It works
> perfectly on Emacs for Mac OSX <http://emacsformacosx.com/>.
>
> But on Emacs Mac Port, it's prohibitively slow. Also, the message list is
> messed up, double spaced and with strange boxes:
>
> [image: display irregularities]
>
> I'm using the exact same configuration as I do with Emacs for Mac OSX.
>
> Does anyone know what's causing these problems, and how to fix them?

As an experiment, you could try 

M-x customize-variable  notmuch-tag-formats <return>

and uncheck the Image box in the flagged entry (and any other entries
where it happens to be checked).