I've had so many diplomacy pop ups from speaking to a few tribes and then not escalating trade with them much and it's gotten so bad it's overlapped the UI and made it impossible to change the speed unless I cut down the list.

I think there should be a quick way to dismiss all

Right click to make them disappear individually

Also once you say no to a trade increase they shouldn't spam it eternally onwards, they should stop or do it after a cooldown

Just my thoughts.