Re: Emacs Slowdown

[Eli Zaretskii <eliz@gnu.org>]

> From: phillip.lord@newcastle.ac.uk (Phillip Lord)
> Cc: <help-gnu-emacs@gnu.org>
> Date: Tue, 10 Mar 2015 12:37:15 +0000
> 
> >> which is an awful lot of functions to be called on every keypress. I
> >> realise that I may have gone a bit overboard here, especially as five of
> >> those functions are mine!
> >
> > The question is: what do those hook do, on average?  If they are very
> > lightweight (profile them to see if they are), then this isn't your
> > villain.
> >
> > Also, try removing most of the hooks when you see sluggish operation,
> > and see if that brings any significant speedup; if not, these aren't
> > what you are looking for.
> 
> Saw Stefan's post and think these are a red-herring also.

So if turning on GC messages doesn't give any hints, I'd suggest to
wait until you see a sluggish cursor movement, then start a CPU
profiler, perform several such cursor movements, produce the report,
and post that here.