lagging with modded mc

Hi! A while back I tried using distant horizons, shaders, and all those kinds of mods with my new pc (has a 4080 good cpu etc.) and at the time I had bad internet so it didnt run at its best. Today I decided now that i have good internet id try it again but my game seems to be lagging significantly more (like 5fps) and I dont know whats causing it.

I have sodium iris distant horizons and continuity + voice chat for a server im in (idk if that effects anything)

Can someone please help me optimize my game and make it not lag because it seriously shouldnt be this low performance
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