I looked into this and found that
pinky tries to canonicalize the information in the "Where" column
automaticaly, and it has no option to disable this behaviour.
see line 285 pinky.c:
if (*ut_host)
/* See if we can canonicalize it. */
host = canon_host (ut_host);
this results in many unnecessary dns queries.
For example on a debian system with acpi-support, /etc/acpi/lid.sh will
make many requests to find the host $WAYLAND_DISPLAY every time the lid
is opened.
"who" has the --lookup (attempt to canonicalize hostnames via DNS)
option, and doesn't do it by default.
Maybe it would be more lightweight to forget about canonicalization
altogether.
