On Tue, Jan 03, 2017 at 12:29:54PM -0500, Sam Steingold wrote:
> In GNU Emacs 26.0.50.3 (x86_64-apple-darwin16.3.0, NS appkit-1504.76 Version 10.12.2 (Build 16C67))
>  of 2017-01-03 built on clr-sds
> Repository revision: 134e86b360cab0d0a5cb634b71a4b06ec26c5f1f
> Windowing system distributor 'Apple', version 10.3.1504
> 
> rebuilt from git tip.
> now emacs is very slow: it takes up to a second for the character to
> appear on the screen as I type.

Sorry about this, we’re trying to rework the NS port so it can handle
the new concurrency code.

Can you please try applying the attached patch, and let us know
whether it improves things?

Thanks!
-- 
Alan Third