Like it says in the title.
Yes. It's a feature provided by OptiFine.
Well, if I'm not mistaken, it was a seperate mod until 1.9, when the developers of Optifine integrated it into the mod.
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No. It's a standalone mod available up to 1.13.2.
It's always been a standalone mod to my knowledge for years, but yes it is for Forge 1.13.2 currently, not 1.14.4 if anyone was planning to use it for 1.14.
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1.15 Fabric/Forge: https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/mods-discussion/2988502-fabric-1-15-snapshot-discussion-thread-install
1.14 Fabric/Forge: https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/mods-discussion/2938388-fabric-1-14-mod-loader-mod-discussion-section
1.13 Rift/Forge: https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/mods-discussion/2925529-rift-1-13-mods-discussion-section
It's both a standalone mod and a feature of optifine seemingly.
Gifs are cool beans
I've used it without having to install the actual mod, just using optifine.