If a timeline or notifications are scrolling too quickly, you can stop them scrolling automatically on the website by using "slow mode":
1. Log in through your server’s website
2. Go to ⚙️ Preferences
3. Tick the box marked Slow Mode, then click Save Changes
With slow mode on, the timelines won't scroll. A message will appear at the top of a timeline when new posts are waiting to appear, and you click on it to see the latest posts.
Apps may have their own equivalents to slow mode.
2/2