@fingolas @atomicpoet @fediversenews Interesting observation! I cant say much about the language effect, as I'm not super active on the Dutch side of Mastodon. Ill pay a bit more attention to the amount of German posts I see to get a feeling for this though.
The time zone effect is hugely noticeable for me as well. European mornings my feed is barely active. Most times I try to post in my evenings for this reason specifically. I've also noticed a drop on weekends as well.