Description of problem:
Problem to run /usr/bin/gnome-shell-perf-tool on rhel-7.6 and on rhel8
I get this message:
Failed to start org.gnome.Shell.PerfHelper: timed out
The same problem I got on rhel8.
run /usr/bin/gnome-shell-perf-tool --replace
So finally we released that gnome-shell-perf-tool is not running with Wayland. With xorg is working properly.