Zicoatl Client : "Memory Leak"

I cannot really assure that this is specifically a memory leak. But it is definitely a case of the game getting progressively slower and slower to the point of hitting a complete halt the longer the fight against Zicoatl goes.

I was playing with my brother and we try to revive each other. My brother died so I was trying to revive him before killing Zicoatl. Reviving heroes is really difficult in this fight, might be impossible for how quickly the boss can fill the screen with lighting or red triangle or just start punching you. So I was really extending the fight constantly trying and failing to revive him. Eventually I noticed that the framerate started getting slower. Then it got REALLY slow. And eventually the game basically paused. I killed the game and rejoined and the instance was actually completely fine and the fight kept going, so this is certainly a client issue.

I am playing on a Steam Deck if that helps.