So I use this app for making addons and I was trying to make a custom biome but that biome was laggy everytime. Eventually, I created a world and I saw a village and then a desert temple that is in the ground. I flew back the other way to see which direction you need to go from the world spawn. I then found a spot in the ground which you can see in an image that I will add later. That's not the point anyway. Go forward from where you spawn in at and you will see the village. If you go past the village then you should see a desert temple that is in the ground. The world seed is -191461783
There is also a ravine in/under the village with lava and water in it. Oh and another cross shape in the ground. Both of the cross shapes are near the village but not in the village.

Okay, so it seems like the custom biome was only lagging because I tried to use custom blocks for it. Like bruh, why did that make it lag?