Is your feature request related to a problem? Please describe.
Not a big problem, but it's kind of frustrating to have my game completely freeze upon enabling a shaderpack.

Describe the solution you'd like
It would be nice if a loading screen was there instead of a freeze, similar to how OptiFine does it by implementing the Mojang screen.

Describe alternatives you've considered
OptiFine does this quite well, as stated before

Additional context

OptiFine does not have a loading screen for shaders. The loading screen seen is reloading resources, which is something Iris does not need to do.

This isn't possible, because as shaders compile they take the thread normally used for... displaying the game.

Ah, i see. Thanks for clearing that up.

OptiFine does not have a loading screen for shaders. The loading screen seen is reloading resources, which is something Iris does not need to do.

Still, it could be nice not to have my game freeze upon enabling shaders.

This isn't possible, because as shaders compile they take the thread normally used for... displaying the game.