Why are notifications delayed?
Currently, Twitter doesn’t provide a notification system for developers so our servers have to check for replies and DMs every few minutes. Twitter also limits how often we can search the API every 15 minutes so we are unable to check more often.
Why don’t you have an option to notify me when someone tweets?
With the current way we get notifications, it just doesn’t make sense to add this feature as it would be delayed like other notifications and potentially not scale well. If Twitter ever gives us a better way to receive notifications, we will revisit this.