Since I and my friends tried reporting this issue several times on the forum and in the game to no avail, I'll try it here. Maybe some dev by accident will see it as I'm sure none of them go to Xbox One technical support section. The issue is present on XBOX ONE for ALMOST A YEAR. When having a bunch of quests in the journal, the framerate of the game drops to below 10 for few seconds every single time the game calculates quest markers position. Here are the scenarios that make the game framerate drop significantly:

- entering a new location (house, zone, anything that requires journals, quest markers to restart)
- advancing in a quest (completing a quest or part of it - anything that makes the quest marker move to a new location)
- switching between quests with a D-PAD.
- zooming in/out of a location on the map

The more quests you have in your journal, the worse it gets. Try getting your journal full and the game becomes unplayable at times. This is not just me. Me, my wife my friends from all over the world are experiencing this issue. We've tried all the possible tricks to fix the issue and the only temporary solution we've found is to remove all the quests from the journal. How come this was still not addressed? At least acknowledge that you're aware of the problem. We're doing you a service by reporting a game breaking bug, not the other way around.