I installed sodium for 1.16.2, and there was no difference in my FPS. I used as many of the same setting as possible and same mods. There was a different GUI, but the performance was the same. With optifine, I get 100 fps compared to 40 ish with the stock renderer. I thought I should be getting at least 150 FPS. What's wrong? (I use Lithium, Phosphor, and mod menu, along with the fabric API). I tried using just Sodium and the fabric API, and mod menu.

Make sure Minecraft uses dedicated GPU.

The GitHub Issue tracker is for bugs and is not intended as a support site. I suggest joining JellySquid's Hideout and providing screenshots of the Profiler Graph and Frame Time Graph during normal gameplay, in the #support channel.