I have had this issue, too. I have noticed more issues with particles after 8.3, since they changed the way particles worked throughout the whole game. Previously, only areas like the heart chamber and demon hunter class hall with a bunch of particulate effects in the air were problematic, but areas like Ardenweald are especially bad. They make my fans start blasting at full speed. Other shadowlands zones are fine. I have disabled particle density and see some improvement, but also can’t see some spells and portals well, so I had to turn it back to the next lowest setting. I wish there was an option to just remove atmospheric effects because this seems to be the biggest issue in zones like that. I am also on a 2019 27" imac but I now play at graphic quality 3 since 8.3. I’m not sure if it would help now, but when these changes occurred, I set my max BG FPS to 30FPS, keeping the other FPS options at 60. I seemed to not have as many issues today.
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