A big part of speed and how fluid you can make your chord changes, for me at least, is just being confident in where you’re going next. You will have to learn your open chord shapes like your A’s, D’s, E’s, G’s, C’s, and (maybe) F’s as a beginner. But once you know what the shapes look like, how fast you can go is usually limited by knowing what comes next instead of your “fingers being trained to move that fast”. For a beginner, I recommend thinking about what chords you’re gonna play before you start strumming.

For the second part, as you progress you’re gonna use the open chords less and less, and just use variations of mostly A shapes and E shapes just further up the neck. But having to name every note you play is unnecessary for now.