Hey, today I want to show you a simple way that you can greatly increase the FPS(frames per second) in Minecraft 1.12.2.
To install and benefit from a significant increase FPS in Minecraft, you have to install Minecraft Forge (this mod will let you install other mods in the game).
Optifine is the mod that will increase your FPS in Minecraft, but will get others functions(shaders support, HD resource pack support) from this mods.
This mod is installing very easy and fast, all you have to do is:
Now, you will have to open the Minecraft launcher with Forge profile.
Now if you have done all the steps well, in Minecraft -> Options -> Video Settings you will have a list with many settings you can do.
Here are the best settings for Optifine in Minecraft 1.12.2: