I found that to just change the animations to fade instead of scale/pan. The duration is unaffected, it just makes it flatter and uglier. I wonder how fast things would feel if you could disable all animations, Windows XP style.
Reduce motion is an accessibility option made to… reduce motion. Changing the animation from swipe to crossfade accomplishes that quite neatly. It keeps everything in place as it switches.
I use it because moving the entire display can give me motion sickness. It’s doing exactly what it should do.