[OS X Emacs] Slow vertical split windows viewing same buffer in Aquamacs 1.6

David Reitter david.reitter at gmail.com
Wed Jan 21 16:05:02 EST 2009

On 20 Jan 2009, at 22:54, Drew Hess wrote:

> I'm seeing a performance regression in Aquamacs 1.6. Open a file
> with 50+ lines in it. (I've tried text, elisp, Lisp and Scheme files
> and all exhibit the same problem.) Make a vertical split window with
> C-x 3. Make sure the 2nd window is displaying the same buffer as the
> first. Now move around the file with C-p, C-n, C-f, etc.; try holding
> one of the keys down until keyboard auto-repeat kicks in, for
> example. On my machine, performance is noticeably sluggish when I do
> this. Each additional vertical window displaying the same buffer
> impacts the performance more negatively, When displaying a different
> buffer in each window, however, the performance seems to be fine.
> When I create horizontal split windows and display the same buffer in
> each, I don't notice any performance hit, unless there's also at least
> one vertical split displaying that same buffer.

I don't see it with vertical splits, but whenever SLIME is loaded.   
(That said, it may still be a problem specific to Aquamacs.)

Does this:

(setq redisplay-preemption-period nil)

make the jumpiness go away for you?

http://aquamacs.org -- Aquamacs: Emacs on Mac OS X
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