Changing Undo Redo in adobe

In This tut i am show you how to change the undo redo status. What performance issue will happened if that setting will be change.

1. Go to the edit>> Preferences >> Performance in the dialog you see highlighted red in the left side choose performance and see the center it will show you what ram it will be reserve and how much is available.
2. But in the right side History & Cache History Status value will the actual undo redo value Change it if you have more undoes or reduce it if you were safe for amount of memory. Here is the preview.......