bug#37000: 27.0.50; gc and laggy Emacs

[Eli Zaretskii]

> From: Alex Branham <alex.branham@gmail.com>
> Date: Sat, 10 Aug 2019 11:27:29 -0500
> 
> Recently I've noticed Emacs sometimes getting _very_ laggy, as in 
> taking up to a half-second to display the a single character that 
> I type. M-x profiler-start suggests that garbage-collection is 
> taking up too much time (see below my signature for example 
> output). gc-cons-percentage and gc-cons-threshold are at their 
> default values. I can't figure out how to reproduce this reliably, 
> but running M-x relint-directory on the Emacs source tree seems to 
> do a decent job triggering it. My Emacs is built from commit 
> 4ce9c6d0b58bd77bc811d6c1c5caf955a5a0be2f (~ 4 days ago) of the 
> master branch. How can I go about tracking this down?

Trying to bisect to find the offending commit would be one way.