DH not wanting to load chunks

Im playing Distant Horizons 1.21 and my preformance drops intensely when I turn on DH, like maybe 120fps with shaders and without shaders its around 30, and thats with the graphics on DH to Minimal, and im in singleplayer and whenever im out of my Render Distance (Vanilla) the LODs just unload, like regular render distance, but at the cost of preformance, why is this happening and why is my preformance so bad here?
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