Latest update making my laptop overheat and lag

Ever since the last update was installed, I cannot get through more than about two games of Hearthstone without my laptop getting super hot and the fan blowing like crazy. The activity monitor app says it is running at like 80-90% of my computers capacity. My battery dies insanely fast. This in turn makes my entire computer lag a lot so it is practically unusable. I have seen people report problems like this on reddit from updates from approx. two years ago. Not sure if anybody else is having this problem since the update, but figured I had to say something. It is only when Hearthstone is open that I have this issue. Already tried a clean install.

Same here, got a MacBook Air 2018 and CPU runs ar 100% all the time. Laptop gets so hot you need to shut down Hearthstone. Please Blizzard, what is wrong ?

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All these months later, still having the same issue. Please respond blizzard, you are keeping away a once very dedicated and loyal customer.