CaidenP

So, I downloaded RL craft and wanted to add some cool dimensions and quest lines, I got twilight forest mods added to RLcraft and then I played finished them and then added the Aether. I loaded up the game normally and started a new world. The screen was lagging like crazy and it started to form a black ring around the screen. I took off the twilight mod to see if it was that and it still happened. I really need a solution to this problem please!!! Thank you. This is in 1.12.2