You might find it helpful to turn on System Preferences > Accessibility > Display > [x] Reduce motion. I go through phases of preferring the fades it applies in

You might find it helpful to turn on System Preferences > Accessibility > Display > [x] Reduce motion. I go through phases of preferring the fades it applies instead of certain animations, although it still doesn't get it to "instant". For terminal, iTerm offers better choices for you to determine the balance between perf and display settings, incl a GPU renderer.