These three mods are fabric-based optimization mods designed for 1.15.2+ by JellySquid. Even though lithium and phosphor are mostly designed as server-side mods they also do optimize client-side slightly. Sodium is a new rendering engine for the game (like optifine) however, it is a ton more efficient than optifine and the vanilla game. None of these mods are cheaty in any way and do not provide any extra features the vanilla game does not have (except for more fps).

If you want more information you can DM me on discord for the discord link to jellies discord (I am not sure if I am allowed to post it here). 

Thank you for coming to my TED talk.