L on Nostr: I follow more than 1500 pople but I don't see anything from 99% of them unless I go ...

I follow more than 1500 pople but I don't see anything from 99% of them unless I go to their profile page and wait for their content to load.
Why is that?
Is that the difference in our set of relays?
How can I set up my #nostr experience to really follow and see some users?
How can I mark some users to never miss their notes?
#asknostr