Ice wall FPS tank in Arena

Noticed every time I fight a frost mage in Arena, when an Ice wall is destroyed, my FPS goes from 60 down to about 5 until the animation of ice wall disappears.

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I have exactly the same issue. It will definitely be something in the setting configuration, but I don’t know what to change.

Can anyone from Blizzard advise us?

This rather sounds like it would be worthy of a bug report - no animation, regardless of how pretty, is intended to have such drastic impact on performance/framerate.