Chunks in the distance break and I can see through blocks

As soon as I move in my Singleplayer World, the chunks start to bug and I can see through certain parts of the world, restarting helps temporarily until it breaks again. Also my game is pretty slow before and after launching, even my MultiMC is unresponsive and needs restarting to work like normal again.

Im using shaders as well, Complementary Unbound I believe

Log: https://paste.ee/p/UA8pmNSV