The future of Optifabric and Recommended alternatives
In 1.15 and 1.16 optifine has been casuing a lot of incompatibilities with a growing number of mods, this is due to the way optifine changes the vanilla code in increasingly invasive and incompatible ways. Fixing these crashes isn't easy or fun and takes a lot of time and energy that I don't have.
I have no plans to continue updating OptiFabric going forward, thus with the help of LambdAurora I have compiled a list of mods that replace and supersede Optifine:
Sodium is a free and open source fabric mod made by JellySquid that drastically increases the performance of Minecraft. Sodium utilises modern rendering techniques along with a range of other optimisations. More more information can be found on the download page linked.
Other recommended mods
Canvas focuses the use of shaders to improve the visual appearance of the game along with providing performance improvements. (Incompatible with Sodium)
These 3 mods are each a great replacement to optifine's much loved zoom feature. They provide more options than optifine's zoom functionality. (You only need to install one)
Colormatic provides support for resource packs that use Optifine's custom color features.
LambDynamicLights adds dynamic lights to Minecraft similar to Optifine's.
motioNO is a client only mod that prevents Minecraft from changing the FOV in all situations.
If you need help installing any of these mods feel free to ask in the fabric discord server in the player-support channel. If you know of any mods that should be showcased here please get in contact with me.