OptiFine 1.21.4 HD Ultra J3

OptiFine 是專為《Minecraft》設計的效能優化模組，主要解決遊戲在一般電腦上幀數不穩、載入卡頓的問題，同時也讓高解析度材質包能完整呈現。它最明顯的特色是提供三種版本：HD Ultra 具備最多優化與功能、Standard 對其他模組的相容性較佳、Light 則適合硬體較弱的筆電，玩家可依需求自行選擇。這款工具由 OptiFine Team 長期維護，更新步調不算頻繁但持續有在推出，在同類工具中屬於主流首選，評價普遍不錯，只是評分人數不算多。

如果你玩《Minecraft》時常覺得畫面不順，或想安裝高解析度材質與光影效果，這套就很值得試試。與 BlueStacks、SmartGaGa 等模擬器不同，OptiFine 是直接作用於遊戲本體的模組，並非獨立執行環境，因此使用前需先確認遊戲版本與模組相容性。它提供免費授權，目前僅有英文介面，對台灣玩家來說門檻不高，但若你仰賴其他大型模組，建議優先選 Standard 版本以減少衝突。

OptiFine is a Minecraft optimization mod for your Windows PC! It allows Minecraft to run faster and look better with full support for HD textures and many configuration options. Enjoy!

OptiFine HD Ultra has the most optimizations and features that can increase FPS. OptiFine Standard is more compatible with other mods. OptiFine Light may be more helpful for underpowered laptops and notebooks, but it does not have any advanced features and is not compatible with ModLoader and Forge.



It comes with many optimizations that should increase the FPS without any configuration. You can further increase the FPS by configuring the Video Settings and finding the trade-off between quality and performance that works best for you.

Features and Highlights

FPS boost

• Doubling the FPS is common
• Decreases lag spikes and smooth gameplay

Support for HD Textures

• HD textures and HD fonts (MCPatcher not needed)
• custom terrain and item textures
• animated terrain and item textures
• custom HD Font character widths
• custom colors
• custom block color palettes
• custom lighting
• unlimited texture size

Support for Shaders

• based on the Shaders Mod by Karyonix

Dynamic Lights

• allows handheld and dropped light-emitting items to illuminate the objects around them
• similar, but not related to the Dynamic Lights mod

Variable Render Distance

• from Tiny to Extreme (2 x Far) in 16m steps
• sun, moon, and stars are visible in Tiny and Short distances

Configurable Smooth Lighting

• from 1% - smooth lighting without shadows
• to 100% - smooth lighting with full shadows

Performance: VSync
Synchronizes framerate with monitor refresh rate to remove split frames and smooth gameplay



Smart Advanced OpenGL

• more efficient, fewer artifacts
• Fast - faster, some artifacts still visible
• Fancy - slower, avoids visual artifacts

Fog control

• Fog: Fancy, Fast, OFF
• Fog start: Near, Far

Mipmaps

• A visual effect that makes distant objects look better by smoothing the texture details
• Mipmap level - OFF, 1, 2, 3, Max
• Mipmap type - Nearest, Linear

Anisotropic Filtering

• Restores details in mipmapped textures
• AF level - OFF, 2, 4, 8, 16 (depends on hardware support)

Antialiasing

• Smooths jagged lines and sharp color transitions
• AA level - OFF, 2, 4, 6, 8, 12, 16 (depends on hardware support)

Better Grass
Fixes grass blocks' side texture to match the surrounding grass terrain

Better Snow
Fixes transparent block textures to match the surrounding snow terrain

Clear Water
Clear, transparent water with good visibility underwater

Random Mobs
Use random mob textures if available in the texture pack



Connected Textures
Connects textures for glass, glass panes, sandstone, and bookshelf blocks that are next to each other.

Natural Textures
Removes the gridlike pattern created by repeating blocks of the same type. Uses rotated and flipped variants of the base block texture.

FPS control

• Smooth FPS - stabilizes FPS by flushing the graphics driver buffers
• Smooth Input - fixes stuck keys, slow input, and sound lag by setting correct thread priorities

Chunk Loading Control

• Load Far - loads the world chunks at distance Far, allowing fast render distance switching
• Preloaded Chunks - defines an area in which no new chunks will be loaded
• Chunk Updates per Frame - allows for faster world loading
• Dynamic Updates - loads more chunks per frame when the player is standing still

Fast Texturepack Switching
Switch the current Texturepack without leaving the world

Fullscreen Resolution
Configurable full-screen resolution

Debug

• Fast Debug Info - removes lagometer from debug screen
• Debug Profiler - removes profiler from the debug screen

Time Control
Default, Day Only, or Night Only - works only in Creative mode

Autosave

• Configurable Autosave interval
• A fix for the famous Lag Spike of Death