Custom Dimension Drops FPS to 1 and GPU to 100%

So I have a mod i've been working on for about a month now and the only thing i'm missing is my dimension. I've disabled my custom mobs from spawning and disabled all structures but when I go into my custom dimension the game is too choppy to play even without mobs. Any suggestions to why this may be causing this. I'm using 1 custom blocks that is translucent, which is the dirt layer. I'm also using the nether generation and void for water layer

All textures used on the custom blocks is 16x16 so I'm not sure if that's what causing it.

Im also running the nether generation