What is the purpose of the jQuery.fx.off global property?
It globally disables all animations. When animations are run, all animation methods will immediately set elements to their final state when called, rather than displaying an effect.
It turns off animations that are used to provide motion effect, but appearance effects remain enabled.
It globally disables animations that are triggered by CSS class changes. Source: jQuery.fx.off Property
It causes animation effects that are triggered via functions to instead be executed using CSS.