I just updated from emacs 25 to 26, and hence updated gnus.  I use gnus,
against a dovecot imap server on localhost.  Generally things have been
fine; I've been using gnus like this since about 2005.  Host is NetBSD,
but that seems unlikely to matter.

After updating, I am observing that on displaying some messages
(articles :-) emacs seems to hang, and ^G results in seeing something
that looks like source.  Another issue is that after typing 'f' to
create a reply-all buffer, C-c C-y to quote the article results in 100%
cpu usage with ^G not interrupting.

I realize I should set debug-on-error and figure out what's going on,
but I don't know how to deal with ^G not working.

I also realize this report is lame and not actionable, but I wonder if
others have seen problems that might be similar or have advice.

Greg