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Re: Why emacs rendering is slow when encountering long lines?


From: Eli Zaretskii
Subject: Re: Why emacs rendering is slow when encountering long lines?
Date: Mon, 21 Oct 2013 19:16:00 +0300

> Date: Mon, 21 Oct 2013 06:00:52 +0300
> From: Eli Zaretskii <address@hidden>
> 
> > Date: Sun, 20 Oct 2013 19:08:51 -0700 (PDT)
> > From: Jiaxin Cao <address@hidden>
> > Injection-Date: Mon, 21 Oct 2013 02:08:52 +0000
> > 
> > Let me provide more information about this. To reproduce the scenario, just 
> > create a line containing about 450 chars, and copy the line 10000 times.
> 
> What characters?  It's important.
> 
> Also, if you add an empty line here and there, do things improve?
> 
> > I use the text-mode to test this buffer. Scroll-down means the cursor goes 
> > up. My OS is windows 8. Emacs version is 24.3.1.

Btw, just for comparison, I made a file like you described with each
line made of 450 'a' characters, and tried your timing functions.  My
times on a 3-year old machine running Windows 7 are much faster: about
50 msec for scroll-down and less than 20 for scroll-up.  It's short
enough to not annoy.



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