Use this Nix Darwin module:

{
  system.defaults = {
    # Reduce window resize animation duration.
    NSGlobalDomain.NSWindowResizeTime = 0.001;

    # Reduce motion.
    CustomSystemPreferences."com.apple.Accessibility".ReduceMotionEnabled = 1;
    universalaccess.reduceMotion                                          = true;
  };
}

RAMBLINGS OF A MADMAN