I have the same obsession for speed and I have given up on desktop environments years ago, ending up on with i3 and mostly CLI. These past years I was forced for some periods to work on macOS, Windows and Gnome. While they clearly work I simply can not stand them. My muscle memory starts an application then immediately start typing and to my surprise something else happens, because the app has not started yet and I still have focus in another window or in the desktop. Or I chain keyboard shortcuts and the same unexpected results happen because the previous command has not completed. It forces me to wait and pay attention to what the system is doing and this annoys me to no end.

I know plenty of people being a lot more productive than me using slow and not very ergonomic environments. So I understand this is just an obsession of mine and not necessarily justified. But once I got used to instant everything it's so hard going back.