Not all things are about speed. Helping the user to understand the "story" of what they're doing is just as important. Most UX kits involve transition animations for this reason.
The user perceives lag after 300ms, and switches thought in less than a 1000ms. If your screen doesn't engage the user while it's making the switch, you risk them starting something else.
That was the entire premise of your prior comment. Any other points you want to hop to?
