mutt seems laggy to resume on v.2.x

[tech-lists]

Hi,

I'm finding mutt significantly more laggy to resume on later
versions (=>2.x) than say 1.5.21.

Let's say there's the list of emails in a folder already 
selected. If I use up or down arrow for example, it'll sit for 
3-4 seconds doing nothing and then move. But once moving, it's
as responsive as it's always been before.

Then, say 5 minutes happen where nothing happens. Slow to move
around again. I'm using imaps. It's not having to re-authenticate, 
so the connection isn't dropping. Ping times to the imap server 
are 77ms, no packet loss.

Is it my config? Maybe should revise it as it's not changed
significantly for more than a decade. What should I be looking for?

For context:
freebsd-current (all debugging has been turned off)
TMP is ~/tmp and is tmpfs (memory) mounted.
$HOME is usb3-mounted spinning rust.

% mutt -v
Mutt 2.0.2 (2020-11-20)
Copyright (C) 1996-2020 Michael R. Elkins and others.
Mutt comes with ABSOLUTELY NO WARRANTY; for details type `mutt -vv'.
Mutt is free software, and you are welcome to redistribute it
under certain conditions; type `mutt -vv' for details.

System: FreeBSD 13.0-CURRENT (arm64)
ncurses: ncurses 6.2.20200215 (compiled with 6.2)
libiconv: 1.16
libidn2: 2.3.0 (compiled with 2.3.0)
hcache backend: tokyocabinet 1.4.48

Compiler:
FreeBSD clang version 11.0.0 (git at github.com:llvm/llvm-project.git llvmorg-11.0.0-0-g176249bd673)
Target: aarch64-unknown-freebsd13.0
Thread model: posix
InstalledDir: /usr/bin

Configure options: '--disable-fcntl' '--with-ssl=/usr' '--with-docdir=/usr/local/share/doc/mutt' '--sysconfdir=/usr/local/etc' '--enable-external-dotlock' '--enable-pop' '--enable-imap' '--enable-compressed' '--enable-sidebar' '--enable-autocrypt' '--with-sqlite3=/usr/local' '--enable-debug' '--disable-flock' '--enable-gpgme' '--without-gss' '--without-bdb' '--without-kyotocabinet' '--enable-hcache' '--without-qdbm' '--without-gdbm' '--with-tokyocabinet=/usr/local' '--with-libiconv-prefix=/usr/local' '--with-idn2=/usr/local' '--enable-locales-fix' '--enable-nls' '--with-sasl=/usr/local' '--enable-smtp' '--prefix=/usr/local' '--localstatedir=/var' '--mandir=/usr/local/man' '--disable-silent-rules' '--infodir=/usr/local/share/info/' '--build=aarch64-portbld-freebsd13.0' 'build_alias=aarch64-portbld-freebsd13.0' 'CC=cc' 'CFLAGS=-O2 -pipe  -fstack-protector-strong -fno-strict-aliasing ' 'LDFLAGS=  -fstack-protector-strong ' 'LIBS=' 'CPPFLAGS=' 'CPP=cpp'

Compilation CFLAGS: -Wall -pedantic -Wno-long-long -O2 -pipe  -fstack-protector-strong -fno-strict-aliasing

Compile options:
-DOMAIN
+DEBUG
-HOMESPOOL  +USE_SETGID  +USE_DOTLOCK  +DL_STANDALONE  -USE_FCNTL  -USE_FLOCK   
+USE_POP  +USE_IMAP  +USE_SMTP  
+USE_SSL_OPENSSL  -USE_SSL_GNUTLS  +USE_SASL  -USE_GSS  +HAVE_GETADDRINFO  
+HAVE_REGCOMP  -USE_GNU_REGEX  
+HAVE_COLOR  +HAVE_START_COLOR  +HAVE_TYPEAHEAD  +HAVE_BKGDSET  
+HAVE_CURS_SET  +HAVE_META  +HAVE_RESIZETERM  +HAVE_FUTIMENS  
+CRYPT_BACKEND_CLASSIC_PGP  +CRYPT_BACKEND_CLASSIC_SMIME  +CRYPT_BACKEND_GPGME  
-EXACT_ADDRESS  -SUN_ATTACHMENT  
+ENABLE_NLS  +LOCALES_HACK  +HAVE_WC_FUNCS  +HAVE_LANGINFO_CODESET  +HAVE_LANGINFO_YESEXPR  
+HAVE_ICONV  -ICONV_NONTRANS  -HAVE_LIBIDN  +HAVE_LIBIDN2  +HAVE_GETSID  +USE_HCACHE  
+USE_SIDEBAR  +USE_COMPRESSED  -USE_INOTIFY  
-ISPELL
SENDMAIL="/usr/sbin/sendmail"
MAILPATH="/var/mail"
PKGDATADIR="/usr/local/share/mutt"
SYSCONFDIR="/usr/local/etc"
EXECSHELL="/bin/sh"
-MIXMASTER

To contact the developers, please mail to <mutt-dev at mutt.org>.
To report a bug, please contact the Mutt maintainers via gitlab:
     https://gitlab.com/muttmua/mutt/issues

     patch-1.5.0.ats.date_conditional.1
     patch-1.5.6.cb.reverse_reply.2
     patch-1.5.7.ust.maildir-mtime.2
     patch-1.5.4.cd.ifdef.1
     vvv.quote
     vvv.initials

thanks,
-- 
J.
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