Here are some examples of how performance could be improved.
If blistering radiance is cast multiple times in a row (due to multicast, for example), there’s no reason to see the text “scorn” cycle through every enemy which already has scorn.
Basically, if an effect is going to inflict buff/debuff X on a creature that already has X, skip the display and move on.
This would probably make sense to be a separate option under “Gameplay”.
Given how often I see the same buff/debuff applied to a creature that already has it, this would probably shorten my battles by 25% or more.
This would also automatically encompass certain other suggestions, e.g. “PLEASE make the Here to Die trait not stack” would automatically be included.