Just play on Fast Graphics, Tiny Render Distance and Smooth Rendering off, I get around 23FPS.
Honestly, I don't understand what Optifine does and how it can help. I'm not saying it doesn't, I just don't understand it.
a bunch of options that you can turn on and off to make everything run faster
for example it gives you the option to turn the sky off
Not only that but it heavily optimizes the game. I set the Optifine settings so that the game's quality was actually a bit better, and the game ran a lot faster, even with a stuff ton of mods (Aether, mAtmos, their APIs, etc.)