fast recompress, normal recompress and full processing mode

[Red-Scorp]

hey guys, wahts going on.
Just wanted to know whats the difference between all these
fast recompress, normal recompress, and full processing mode.
How are they diff and which one should i use and when should i use it.
THanks :)

[Acaila]

Please do a search, it's all been answered before.