I just wanted to pop in here since I've been monitoring this issue here on the forums ( and in our tickets ) The team here in NA knows about this issue and we have informed the Developers about it along with the traction it has gotten here on the forums. They know about it and as far as we know looking to work towards a solution to the UI Lag Issue.
At this time we do not have an ETA :c I know that this issue is super frustrating, I experience it myself when I play as well. We are taking your reports seriously and reported it as soon as we could to our team. I do apologize for the delay addressing this issue and wish I had a better ETA to give everyone.