bug#21597: 25.0.50; Extremely slow redisplay on emacsclient

[Eli Zaretskii]

> From: Kaushal Modi <kaushal.modi@gmail.com>
> Date: Thu, 1 Oct 2015 12:30:11 -0400
> Cc: "bug-gnu-emacs@gnu.org" <bug-gnu-emacs@gnu.org>
> 
> I reverted to one prior commit (
> http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=82df1878e6559188e688195f992fff10f35035e8
>  )
> and the issue is gone.

Please try the latest master.