This is caused by Oculus (Iris). I have no way to fix this without removing Oculus, the only workaround we are aware of is using a shader.
The easiest fix for this issue is just to uninstall Oculus. See [Modifying Optional Content](modifying-optional-content.md) for instructions on how to do this.
If you're on a lower end system, but still want to use Oculus, look for a shader identified as "Potato" in Resourcify. We recommend [MakeUp UltraFast](https://modrinth.com/shader/makeup-ultra-fast-shaders). You can get a lot of performance out of this shader if you turn off all of the effects in its settings menu.
