Well, that’s encouraging …
I’m using Gnome 42 and Wayland.
This may be a Gnome problem: journalctl has hundreds of lines like
/usr/libexec/gdm-x-session[2401]: (EE) event3 – HOLTEK USB-HID Keyboard: client bug: event processing lagging behind by 28ms, your system is too slow
And thousands like
gnome-terminal-[4238]: void terminal_screen_shell_preexec(VteTerminal*): assertion ‘!priv->between_preexec_and_precmd’ failed
The timings seems to correlate with my attempts to copy and paste.
And I’m pretty sure my system is not too slow … Ryzen Threadripper 1950X 16 core/32 thread 3.4GHz / 128GB RAM / 2 × GeForce 1080 Ti