Banners A animated banner increases your clickthrough rate a lot compared to a static banner. That does not mean that an animated banner is always better than a static banner. There are lots of factors. On this page I'll explain the basics of using banners to market your website. File size is important.
Smaller files load faster , and that's always better.
You can shrink a banner's file size without changing its appearance by using one of the many utilities made for that purpose. Adobe's Image Ready , Macromedia's Fireworks and JASC Software's PaintShopPro all have filters that reduce file size while maintaining image quality. Static banners have a smaller file size than animated banners. That makes them load faster and that can often be more important than a higher clickthough ratio. Static banners are mostly for other sites to host.