We have experienced this issue in 1.8.1 on Xbox One and the lag is more significant during a multiplayer split screen session. In addition to the comments by Coen above which are spot on, the lag occurs when moving items around within the personal inventory each time a pickup or placement of an item occurs. Also during a split screen session the other user experiences a slight freeze during these open/close of personal inventory or pickup/place of items within inventory.
Paul Hasselfeldt
We have experienced this issue in 1.8.1 on Xbox One and the lag is more significant during a multiplayer split screen session. In addition to the comments by Coen above which are spot on, the lag occurs when moving items around within the personal inventory each time a pickup or placement of an item occurs. Also during a split screen session the other user experiences a slight freeze during these open/close of personal inventory or pickup/place of items within inventory.