Mac OS game lag following patch 2.53.3.84249

Edit: Whoops! I missed the MacOS support forum. Can a kind mod move this thread? Thank you!

Hello there!
Ever since this last Heroes of the storm balance patch, I am having immense lag issues (constant spiking between 2-20 fps). Checking activity monitor, HotS is drawing 100%+ of the CPU of my computer. I’ve heard HotS has some pretty inefficient use of CPU cores, but this was never an issue before. Any one else notice this, or am I the lone casualty of this new patch?

Specs: 2019 iMac Mojave 10.14.6
3.6 GHz core i9
64gb ram

Any help would be appreciated.