GNOME : Ubuntu 18.04 ALT+TAB delay
Solved it by simply installing https://extensions.gnome.org/extension/1317/alt-tab-switcher-popup-delay-removal/
P.s. it remains to solve Ubuntu 18.04 super key switcher (gnome-shell app menu) and i can switch from unity to gnome ^)
Stolen shamelessly from here: http://ubuntuhandbook.org/index.php/2019/08/speed-up-alt-tab-ubuntu-18-04/
- open Ubuntu Software app
- search for the string "remove alt tab popup"
- install the
Alt-Tab Switcher Popup Delay Removalapp