Re: C-n is very slow in Font-Lock mode

[David Kastrup <dak@gnu.org>]

"Eli Zaretskii" <eliz@gnu.org> writes:

>> Cc: emacs-devel@gnu.org
>> From: David Kastrup <dak@gnu.org>
>> Date: Wed, 27 Apr 2005 11:43:01 +0200
>> 
>> We are talking about the situation where the input is coming in faster
>> than Emacs can process it.
>
> See, we don't really know that.  Whether this is true or not,
> depends on several unknown factors, like the rate of keyboard
> auto-repeat on the user's machine vs the time it takes Emacs on that
> machine, with that CPU and display type/toolkit to perform
> redisplay.
>
> In my experience, movement with C-n gives Emacs enough time to
> update the display.

The last time I looked, this thread was about Emacs not being fast
enough to update the display.

> jit-lock-defer-time non-nil works by disabling fontification
> altogether until Emacs is idle.  If fontification is not disabled,
> you yourself explained that vertical-motion _must_ fontify to keep
> its calculations accurate.

It seems I am a complete failure at conveying my meaning.  I was
arguing for a setting where vertical-motion is allowed to keep its
calculations inaccurate with regard to font locking.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum