Well I just replayed the (very early game spoilers)
memory with internet disabled on ps4 but framedrops still appeared in the same areas. Not seeing much of an improvement overall in fps.
Yesterday the game seemed much more smooth, but maybe it was because I was watching my SO playing instead of playing myself, or because the later chapters are better optimized or something. Or maybe it was just my imagination.
I'll keep playing like this, see if I notice any improvements. But not getting my hopes up.
I really wish they scaled down on the NPC crowds, they literally add nothing to the game and all they do is hog up memory. During chases and when you're being pursued by guards it can become very frustrating when the framerate takes a dive and you end up missing jumps or otherwise messing up while freerunning.
Also lol at "we went with 30fps because it's a better fit for AC" when the game is struggling to stay at 25fps consistently.