What are the differences between normal and slim package of jquery?

Looking at the code I found the following differences between jquery.js and jquery.slim.js:

In the jquery.slim.js, the following features are removed:

1. jQuery.fn.extend
2. jquery.fn.load
3. jquery.each (attach a bunch of functions for handling common AJAX events)
4. jQuery.expr.filters.animated
5. AJAX settings (jQuery.ajaxSettings.xhr, jQuery.ajaxPrefilter, jQuery.ajaxSetup, jQuery.ajaxPrefilter, jQuery.ajaxTransport)
6. XML parsing (jQuery.parseXML),
7. Animation effects (jQuery.easing, jQuery.Animation, jQuery.speed)

The short answer taken from the announcement of jQuery 3.0 Final Release :

Along with the regular version of jQuery that includes the ajax and effects modules, we’re releasing a “slim” version that excludes these modules. All in all, it excludes ajax, effects, and currently deprecated code.

The file size (gzipped) is about 6k smaller, 23.6k vs 30k.