Subject: bug#15555: 24.3; Bidirectional display very slow with long lines

From: Eli Zaretskii <[email-masked]>
Date: Tue, 26 Jan 2016 16:41:10 +0200

> From: Andrew Hyatt <[email-masked]>
> Cc: Eli Zaretskii <[email-masked]>,  [email-masked],  [email-masked],  Stefan Monnier <[email-masked]>
> Date: Tue, 26 Jan 2016 00:13:01 -0500
> 
> FWIW, on Emacs 25 on Mac OS X, the bidi text as reported in the initial
> bug is still very slow.

Nothing was done since then to speed up redisplay for such long lines.