Whenever I face structures I have built (seemingly when plants are growing) I believe my frames drop to 30fps and stay there for a few seconds and fluctuate to 60 until it is back to 60fps constant. It's worse when I found a glitchy mineshaft in my world. I explored it and would get dips when I faced certain directions even after it loaded. Maybe it's a certain entity that's causing the drops? Sometimes, these drops seemed to crash my game once.

Thanks
-lirodelgado17