Dear Lilith,
The platform public activity feed is displayed identically for all our users.
In an effort to reduce email spam, we have reduced the number of email notifications that are sent to users each hour, specifically we use a Mail Queue system, which is also used to notify site owners about new comments on their site content.
This may seem to delay emails to site owners at peak times, but you should also consider that our many users live in different timezones.