> From: Sam Varshavchik <mrsam@courier-mta.com>
> Date: Sun, 03 Dec 2017 12:55:49 -0500
>
> Attached is simple makefile with a bunch of echo statements that reproduce
> the output of an actual compilation. I had to gzip and attach it, in order
> to avoid the large lines getting messed up by E-mail formatting.
>
> Saving this makefile, and hitting F5, or executing "compile" makes emacs
> spin with 100% CPU utilization for about five seconds, before it starts
> responding again. Then, going to the compilation output buffer, and M-> to
> go the end of the buffer, that also pegs emacs for another 4-5 seconds, at
> 100% cpu.
>
> Yup, these are very long lines. But that's the end result from automake and
> libtool. This is the real world, when it comes to C++ development these
> days...
Maybe my machine is much faster than yours (although it's a 6-year old
box), but I don't see such long delays, the responses are sub-second
here (something like 0.2 sec or so). Did you visit the file in
Makefile mode or in some other mode?