Official Link:
https://www.curseforge.com/minecraft/mc-mods/sodium

Sodium is basically Optifine but it actually works, is not a buggy piece of shit that takes forever to update, and the performance improvements are amazingly high due to proper usage of modern OpenGL.

At 32 chunk render distance with a 2070S (nvidia reference chip), Ryzen 5 3600, and Optifine I get 60 fps looking down at an entire generated SP world, but with Sodium I get 300+ fps, which is literally an improvement by 500%.

It's a complete no-brainer to use on vanilla clients and probably the best rendering engine replacement mod out there.

@CraftyMyner Added to the allowed list.

CraftyMyner loves his server, thank you very much! Now I can run around with 700+ fps in spawn

a true patriot!

I saw 110 fps before, 120 fps after. Not sure it actually made any difference for me.

@TimmyBoyT I saw 110 fps before, 120 fps after. Not sure it actually made any difference for me.

If you are running very old hardware or drivers that don't support OpenGL 4.3+ then you will not gain much, this mod tries to take full advantage of modern hardware and OpenGL.

I've started using it and i've seen like 200% performance inc at least

@deyahruhd If you are running very old hardware or drivers that don't support OpenGL 4.3+ then you will not gain much, this mod tries to take full advantage of modern hardware and OpenGL.

My machine is getting old, but I think it supports OpenGL 4.4 (Dual Radeon R9 380's)
Maybe I should be happy it wasn't worse to begin with.

@TimmyBoyT Radeon R9 380

Radeon cards are notoriously bad for OpenGL, usually due to drivers. Try updating them, and if they don't change a thing then that's unfortunate.

@deyahruhd Radeon cards are notoriously bad for OpenGL, usually due to drivers. Try updating them, and if they don't change a thing then that's unfortunate.

Good advice, and updating the Video Drivers gave me a warm fuzzy feeling. =)
No boost to fps though sadly. I guess this boost wasn't meant for me.

That's an integrated card, that's your issue