Perfectly Optimized should improve Vanilla FPS by roughly 400% and Performance upto 250%!
Test results prove that it gives better FPS than stated (Check Images)

Perfectly Optimized

Performance and Fps

Perfectly Optimize is way faster than Optifine as instead, it uses Sodium for most of the fps and performance improvements along side Lithium, Indium, Spark, and many other mods for optimizing Performance and FPS

Cleaner and Faster operation
Removes the fade out animations, resource/shader pack loading screen, Fast quit for single player letting the world save in the title screen and faster language reloading

Optifine parity
Has features from Optifine ported like Connected Item Textures (CIT), Connected Textures, Animated textures, GUI textures from texture pack, Dynamic lights and Zoom

Bug and Crash Fixes
Fixes a lot of bugs(and a few crashes) that Mojang has not fixed yet in current version, optimizing performance more, and also fixes that annoying gap in hand-held item models

Utility
Adds utility like Zoom, Search Bar in controls screen, Easier Mod config, Simplifies Armour Trim tooltips, Changes the Mount HUD to display the jump bar only when trying to jump, Advancements like Monster Hunter, Adventure Time, etc. tell you what you finished and what you haven't

Misc.
Improves the Third-Person Camera view, Crafting Table utilities, Skybox is customizable with texturepack, 3D skinlayers, Third Person view animations, Controller support, MacOS Input fixes

Nvidium(makes larger render distances not impact fps or performance) only works with Nvidia gpus so it turns itself off when there isn't a supported gpu

Forge Version has been made!!!! Perfectly Optimized (Forge)

Downports available at Perfectly Optimized (Downports) (1.8 - 1.8.9, <s>1.15-</s>1.16.5, 1.19.4)

Perfectly Optimized (Fabric)