If you are referring to a "white fuzz" on the saved animation, then that is a result of the matte setting you are using when you optimize and save.
See also: Optimize Tab
Click the Optimize tab in the Workspace, and look for the Matte setting. Click the image under the word Matte and a menu will pop up. Choose "None." This will get rid of the white fringe, or "jaggies" as you call them.