When it comes to filesizes there is quite a difference in the size of the full packages. With MooTools you download a file based on what you want, this can range from 2.35Kb to 179Kb as the non-compressed versions. MooTools also allows them to be downloaded in a "compressed" form that reduces the footprint of using MooTools on your site, the full package being 42.6Kb. Scriptaculous to some degree is modular, with Effects, Builder, Prototype and Drag/Drop being separate. The full package size for this is 220Kb - putting MooTools in the lead so far when it comes to resources.
|Compressed||Plain Text||Compressed||Plain Text|
|Drag & Drop / Sortables||20.7Kb||92.4Kb||n/a||66.9Kb|
|Fig 1. Filesize comparison between MooTools and Script.aculo.us|
Please note that all module sizes includes any dependencies on other files that they may have. For example with MooTools all require the Core module, so that is included in the filesize for all others.
Another point worth remembering is that there are many differences between what the libraries can do, but we look at that in more detail next.
Smallest Footprint: MooTools v1.11 (42.6Kb)