Re: Performance issues with long lines in shell mode

["Andreas Röhler" <andreas.roehler@easy-emacs.de>]

On 07.05.20 18:40, David Karr wrote:
> I'm using Cygwin Emacs v26.3.
>
> I use shell buffers in Emacs very often. Some of the command lines I run
> end up producing output with a large number of lines, and sometimes with
> very long lines. If the output is a large number of lines, it doesn't
> present any particular problem.  However, if it ends up producing very long
> lines (equivalent of a hundred lines or more), I find that it gets very
> slow. I generally don't even keep my cursor at the end of the output, so
> it's adding output that I'm not even seeing. However, I can still tell that
> it's running slowly. If I occasionally jump to the end of the output, I see
> it sending characters in bursts, but much less than a line at a time.
>
> If I know that what I'm about to run will create long lines, I generally
> try to remember to pipe it directly to a file and then open that file. That
> goes much faster than letting it output to the shell.
>
> Is there some mitigation I can configure that will help with this?

AFAIU there might be a solution avoiding interactive use of shell, 
sending stuff to some shell-process buffer instead while not displaying 
the latter.

Considering the display-engine possibly causing the slowness.

May you provide  an example-case  suitable for benchmarking?

Best,

Andreas