Pictures GIF are normally more spacious than a normal picture with the same definitions since they are composed of a superimposing of pictures. Then to reduce the size of a picture GIF while minimizing loss in quality, it is necessary to know how to manage.
GIF Optimizer is an utility of optimization of pictures GIF. The objective of program is to reduce the weight of the file while minimizing losses in quality.
GIF Optimizer does not limit himself to fixed pictures, he also allows to lighten animations GIF.