One challenge with #Holos: the relay can accumulate a lot of pending activities. Users have to download everything before seeing their feed.
By design, the relay has no knowledge of your followers or followings and never will. That's why we introduced Bloom filters (https://en.wikipedia.org/wiki/Bloom_filter): your device sends a compressed version of your followings at each sync so the relay only returns what matters. At worst you get a few extra activities, but never miss any. (1/2)