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Give up OptiFine

One of the goals of Fabulously Optimized is to provide feature parity with OptiFine, in order to make it easier for users to transition away from it.
Here is the list of OptiFine features that are supported in this modpack:
✔️ = Supported
🚧 = Partly supported
🔜 = Soon supported
❌ = Not supported

Video Options

Option
Is supported?
Mod providing the feature
Animation toggles
✔️
Capes
✔️
Detail toggles
✔️
Dynamic Lights
✔️
Miscellaneous toggles
✔️
Particle toggles
✔️
Performance
✔️
Smart Leaves¹
✔️
Zoom²
✔️
Zoomify
Shaders
🚧
Iris (Tutorial). Some shaders don't work.
Smooth Lighting Level
There's an issue in the Sodium Extra mod.
32+ Render Distance

Custom resource pack features

Option
Is supported?
Mod providing the feature
Animated Textures
✔️
Animatica
Better Grass/Snow³
✔️
Connected Textures
✔️
Custom Colors
✔️
Custom GUIs
✔️
OptiGUI
Custom Items
✔️
Custom Sky
✔️
Emissive Blocks
✔️
Emissive Entities
✔️
HD Fonts
✔️
HD Screenshots
✔️
Fabrishot
Natural Textures
✔️
Random Entities
✔️
Resource pack splash screen
✔️
Puzzle
Custom Entity Models
🚧
Anisotropic Filtering
¹ Not identical to OptiFine as people did not prefer the look. If you want it to be identical:
  1. 2.
    Install the original Cull Leaves
  2. 3.
    Enable Cull Leaves' bundled resource pack
  3. 4.
    Disable "Use Block Face Culling" in Options → Video Settings... → Performance.
² The defaults do not match OptiFine, because people preferred a smoother zoom. To make it identical to OptiFine:
  1. 1.
    Click Mods button, search for Zoomify, click it and on the top left hit the Configure icon.
  2. 2.
    Head over to Misc tab, set the preset to OptiFine
³ Better Snow is opt-in, because changes some textures too, making it weird with some resource packs:
  1. 1.
    Click Mods, search for LambdaBetterGrass, click it and on the top left hit the Configure icon.
  2. 2.
    Set Better Snow to ON
Additionally, you can enjoy:
Parity with OptiFine is an ongoing process. If you're interested in what's coming, see this list.
If you're having issues with OptiFine's resource pack features, see this wiki.
See also: Recommended OptiFine alternatives on Fabric, a list that inspired me to create this modpack in the first place.