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)
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, no resource/shader pack loading screen,<s> Fast quit for single player letting the world save in the title screen and faster language reloading </s>(no forge ports availible for fast quit)
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, <s>Changes the Mount HUD to display the jump bar only when trying to jump</s>(no forge version), 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, <s>Controller support</s>(no forge ports availible), <s>MacOS Input fixes</s>(no forge ports or mods availible)
Fabric Version highly recommended as it's better than forge for performance: Perfectly Optimized (Fabric)
Downports (Forge & Fabric) available at: Perfectly Optimized (Downports)