Storm Call of Trarthus performance issue/spell DOT no info

Today I was testing new skills for upcoming 3.27 league and I stumbled upon.
I and my brother noticed how much this spell uses the graphics card (you can hear it struggling) just casting it 2-3x times, linked with Spell Echo and Spell Cascade Support.
Not to mention when there are many enemies in one place.



and there is no information on how much DOT this spell deals.




There are a lot of spells that have same or worse performance issues.
Like overcrowding the screen with effects, So you can barely see what you're doing.
How many times I just skip playing some good spells because I get a headache from these effects that overcrowd the screen.