This mod adds support for HD textures and a lot of options for better looks and performance. Doubling the FPS is common.
Features:
Editions:
Installation:
For 1.6 and up
Installation for Minecraft 1.6.2
A. Easy
- Use the official launcher to download and start once Minecraft 1.6.2.
- Start Magic Launcher
- Click “Setup”
- Select Environment “1.6.2″
- Click “Add” -> select the OptiFine ZIP file
- Click “OK”
- Login and play
B. Not so easy
- Use the official launcher to download and start once Minecraft 1.6.2.
- Go to the minecraft base folder (the official launchers shows it when you click “Edit Profile” as “Game Directory”)
- Go in subfolder “Versions”
- Rename the folder “1.6.2″ to “1.6.2_OptiFine”
- Go in the subfolder “1.6.2_OptiFine”
- Rename “1.6.2.jar” to “1.6.2_OptiFine.jar”
- Rename “1.6.2.json” to “1.6.2_OptiFine.json”
- Open the file “1.6.2_OptiFine.json” with a text editor and replace “id”:”1.6.2″ with “id”:”1.6.2_OptiFine” and save the file
- Copy the files from the OptiFine ZIP file in “1.6.2_OptiFine.jar” as usual (you can use the 1.5.2 instructions for this) and remove the META-INF folder from “1.6.2_OptiFine.jar”.
- Start the official launcher
- Click “Edit Profile”
- Select “Use version:” -> “release 1.6.2_OptiFine”
- Click “Save Profile”
- Click “Play” or “Login” to start the game
Installation for Minecraft 1.6.2 with Forge
A. Easy
- Use the official launcher to download and start once Minecraft 1.6.2.
- Use the Forge installer to install Minecraft Forge
- Use the official launcher to start once Minecraft with the Forge profile.
- Start Magic Launcher
- Click “Setup”
- Select Environment “Forge9.10.X.Y”
- Click “Add” -> select the OptiFine ZIP file
- Click “Advanced”
- In the field “Parameters” add “-Dfml.ignorePatchDiscrepancies=true”
- Click “OK”
- Login and play
B. Not so easy
- Use the official launcher to download and start once Minecraft 1.6.2.
- Use the Forge installer to install Minecraft Forge
- Go to the minecraft base folder (the official launchers shows it when you click “Edit Profile” as “Game Directory”)
- Go in subfolder “Versions”
- Go in subfolder “Forge9.10.X.Y”
- Copy the files from the OptiFine ZIP file to “Forge9.10.X.Y.jar” as usual (you can use the 1.5.2 instructions for this) and remove the META-INF folder from “Forge9.10.X.Y.jar”.
- Start the official launcher
- Select profile “Forge”
- Click “Edit Profile”
- Select the checkbox “JVM Options” and in the field next to it add “-Dfml.ignorePatchDiscrepancies=true”
- Click “Save Profile”
- Click “Play” or “Login” to start the game
For Minecraft 1.5 and down

OptiFine HD B4 Ultra for Minecraft 1.6.2
has all the features of Standard, Smooth, Multi-Core and AA, highly configurable
http://www.dl2.9minecraft.net/index.php?act=dl&id=1374534915
http://www.dl3.9minecraft.net/index.php?act=dl&id=1374510441
http://www.dl4.9minecraft.net/index.php?act=dl&id=1374510172
OptiFine HD B4 Standard for Minecraft 1.6.2
has built-in support for HD textures, HD fonts and BetterGrass, MCPatcher not needed
http://www.dl2.9minecraft.net/index.php?act=dl&id=1374534870
http://www.dl3.9minecraft.net/index.php?act=dl&id=1374510395
http://www.dl4.9minecraft.net/index.php?act=dl&id=1374510121
OptiFine HD B4 Light for Minecraft 1.6.2
The light edition improves FPS, especially for slower computers. Gains of 20 FPS and more are common. No HD features or extended configurations included. Based on Optimine by Scaevolus.
http://www.dl2.9minecraft.net/index.php?act=dl&id=1374534777
http://www.dl3.9minecraft.net/index.php?act=dl&id=1374510304
http://www.dl4.9minecraft.net/index.php?act=dl&id=1374510031
Older version:
For 1.5.2
For 1.5.1
For 1.5
For 1.4.7/1.4.6
For 1.4.5
For 1.2.5
Credits: sp614x