Animated .gif files cab be really large in size. If you want to reduce and compress animated gif images upto 90% then here is a perfect lossless compression tool for you.
Optimize Animated .GIF Images to Reduce File Size
GIF Optimizer is a nice utility you can use to easily optimize GIF file for your website. Savings of up to 90% in file size is possible, which can decrease web page download times, save the disk space and reduce bandwidth charges.
> Download GIF Optimizer : Link (2.5mb)
GIF optimizer includes two preview panes to help you compare the original GIF with the optimized GIF. The color reduction option is able to create much smaller GIF!