Infernum Extreme Lag in Hardmode

So, I am trying to play through Calamity Infernum Mode but I am getting like 5 FPS whenever I fight something like the Twins or later bosses, I have tried every setting, I have tried high priority, I have tried using less mods, nothing helps.

I have a beefy pc for as far as I know: 48 GB RAM, RTX 3060 and AMD Ryzen 5 3600, Both Terraria and TMod are installed on a SSD.

What can I possibly do?

All in Singleplayer btw!
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