Intense CPU Slowdown during High-Intensity Content

Whenever I summon my totems that all cast Storm Burst of Repulsion, it sometimes causes a CPU slowdown ingame that lasts until the mobs are dead. If there's enough mobs at once, it can cause a complete lockdown that reduces the game to less than 1 fps, while the ingame performance monitor shows CPU latency at over 600ms, while other monitor software shows the cpu as barely doing any work.

Happens whenever I do large breaches, legion monoliths, etc.

Using Fedora Linux, Proton GE 10-32

Imgur link to the video I took showcasing this:
https://imgur.com/a/AKJMzRN