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## Re: Regarding performance issues with the Emacs 25.1 Windows-build

 From: Richard Copley Subject: Re: Regarding performance issues with the Emacs 25.1 Windows-build Date: Mon, 9 Jan 2017 07:40:00 +0000

On 9 January 2017 at 06:33,  <address@hidden> wrote:
> I encountered huge lags when using org mode (detailed below) on build
> “emacs-25.1-2-x86_64-w64-mingw32.zip” with “emacs-25-x86_64-deps.zip” (from
> ftp.gnu.org).
>
> With the same configuration and the same org file, everything is fine on Mac
> (emacs 25) and on Windows (emacs 24.5), so I think I might post is here. I
> am sorry if this is the wrong place.
>
>
>
> Reproducing it is a little bit tricky.
>
> It seems to happen when certain utf8 symbols are displayed in the buffer.
>
> By saying "certain utf8 symbols”, I refer to those that are not with the
> common width, so it depends on the font you are using.
>
> What I did is the following.
>
>
>
> I am using the latest org mode (version 9) and have turned on
> “org-pretty-entities” , which replaces some latex codes (eg. \alpha) with
> their corresponding utf-8 symbols.
>
> The font I use in emacs is “Hack”. With this font, greek letters are all OK,
> they have the same width as the English letters.
>
> One example to show the lag is “\gg”.
>
> Simply open an org file and put in “\gg” followed by a space and some other
> letters. “\gg” will be displayed as a utf8 symbol.
>
> Then try to move the cursor quickly. You should experience huge lags.

Try installing the Symbola font, if you don't already have it.

(https://debbugs.gnu.org/cgi/bugreport.cgi?bug=25279)