Combining multiple jQuery animations?
You can use the same options object for all three animations.

var opts = {
    useTranslate3d: true,
}
$(".loading").delay(2600).fadeOut(opts);
$(".zip").delay(1900).slideDown(opts);
$("#zip").delay(2800).slideDown(opts);


Having .zip and #zip pointing to different elements might also be a bit confusing - but that depends on your DOM structure.