When i'm moving through the map, like on horses or on foot, i experience random 1 second lag or freeze or however you wanna call it. The game simply stops for 1 second and after the 1 second, the game runs normal again, until it happens again after a while when i keep traveling. It doesn't happen during combat or anything. It happens only when i travel on the map. I think it happens when the game needs to load another part of the map when i travel.
However, i kinda found a reason why this is happening. I have the game on SSD, but my documents forlder and basically everything else is on HDD, except for Windows which i have on another different small SSD. I made sure i have set my HDD not to go to sleep mode ever. So it never goes into sleep mode when playing the game. I get the lag anyway. However, when i start shadowplay recording on the HDD during the gameplay, the lag is gone. It seems like when the HDD is constantly busy, the game won't lag. But i would like to play without the recording and without the lag though. AC Origins and Odyssey didn't have this problem, so i don't see why all of a sudden it should be my HDD's fault.