Re: emacs rendering comparisson between emacs23 and emacs26.3

[Paul Eggert]

On 4/4/20 1:55 AM, martin rudalics wrote:
>  >  > The basic slowness of Emacs over the past years is a direct consequence
>  >  > of that policy.
>  >
>  > How many users is that true for? When Emacs is slow for me, it's usually 
> because of very long lines. Is that the same issue, or a different one?
>
> As mentioned in my answer to Stefan the most recent issue I noticed is
> that mouse-wheel scrolling buffers for xdisp.c and dispextern.h consumes
> 100% of my CPU and still takes some ten seconds to complete.

I looked into this, and although it's no doubt fundamentally due to a slow 
algorithm, the slowness is exacerbated if you use -Og (which you appear to be 
using). Stefan's recent message hinted at this. I installed the attached into 
master to try to fix the -Og issue; please give it a try.

The slow algorithm should be fixed too, but I'm no expert there.

>  > Is that the Black Edition 5000+ or the regular one? The Black Edition was 
> quite the thing in 2007. :-)
>
> How would I find out?

Your BIOS right after cycling power, I expect. It's not high priority to find 
out. As I vaguely recall the main advantage of the Black Edition is that you 
could overclock, and if you had a Black Edition my next suggestion was going to 
be a joke that you should overclock your ancient and slow CPU to make your Emacs 
faster....

gcc-Og-patch.diff
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