If You Run Very High Resolution Texture Packs And It Makes Your Minecraft Lag, It Will Lag No Longer Place The 'RAM' Bat File In The Same Place Or Folder As The Minecraft.exe (minecrat Launcher) And It Will Increase The Limited Amount Of Memory Minecraft Is Aloud To Use.
This Will Definetly Work For Windows, I Am Not Sure About MAC.
Also Check Out This Space Base Map That I Have Made.
(it is a work in progress)
1-this goes under the "tools" section.
2-if, I remember correctly, doesn't minecraft already allocate 1GB of RAM?
3-the fact that you don't even know if it will work on a Mac make me doubtful that you actually made it...so, teorically, an adf.ly link is a bit incorrect.
I personally use a batch file to launch my game but I made it myself, I don't trust anything like this unless I made it myself. All it would take is a five line batch file to wipe your most precious bits of data from existence.