Optifine Mac OS X Installation Tutorial
Download OptiFine HD FPS Boost Mod for Minecraft 1.4.7. Well this one of most popular mod those being OptiMine and OptiFog have been updated again. Users who install Optifine can experience almost 3 times the FPS (Frames per second) and even the default graphical settings of Minecraft experience a smoother and cleaner upgrade.
OptiFine 1.4.7 Mod adds a lot of options for better looks and performance. Doubling the FPS is common. Moves fog away, adds mipmaps, chunk loading control (mod CAF), Smooth FPS, brightness control, VSync and many other.
OptiFine 1.4.7 Mod farview can extend your viewing distance up to a factor of 3, which is excellent if you need to grab a distant view of a particular object or landmark for whatever reason. You can tweak the night and day settings to allow infinite day or night. And of the coolest options by far is OptiFine clear water setting. This will allow you to see underwater for miles which is especially useful on some of the maps mods that feature really deep water.

OptiFine 1.4.7 Mod Features

FPS boost
Support for HD Textures
Configurable Smooth Lighting
Smart Advanced OpenGL
Fog control
Mipmaps
Better Grass
Better Snow
FPS control
Chunk Loading Control
Configurable Details
Configurable animations
Fast Texturepack Switching
Debug
Time Control
Autosave

Download Optifine:
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Instructions:

Locate your minecraft.jar file. On Mac, its in/Library/Application Support/minecraft/bin
Create a backup of minecraft.jar
rename minecraft.jar to minecraft.zip and double-click it to extract the contents
rename the resulting folder to minecraft.jar and open it
copy the .class files from the downloaded zip into the minecraft.jar folder, replacing previous files
Run Minecraft and test!
That's it, there really isn't much to installing the mod.