A Twitter oddity in times of real-time data

In times of real time data-collection and real time action on that data, it feels a bit odd that Twitter in parts isn’t real time. When I post a tweet it shows up immediately. But my number of tweets doesn’t change. I have to refresh my browser window for that to happen. And if I remove a follower (Spam…) that doesn’t show right away either. I wonder what it is behind the scenes at Twitter, that explains this. Is it for the same reason that I have seen that “We might be over capacity-whale” so many times?