Help with FPS issue / Server lag issue

So, i think I've got a pretty decent PC (32gb ddr5 ram, amd 7600 processor, RX 7800XT graphic card and such) and while playing Calamity plus a couple of QOL mods and we summon a boss - well, everything starts lagging out. I can see in my task manager that tmod isnt consuming even 40% of my PC resources. Is there any way to increase this or somehow improve the performance?
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