Swiper loading optimization

swiper-lazy-init.js

/*
 * Include this file early and then initialize your Swipers using
 * swiperLazyInit(...). Swiper lib can then be loaded async or later.
 * 
 * Re-configure example: var slideshow = new Swiper("#slideshow", { speed: 400 });
 * Becomes: swiperLazyInit("#slideshow", { speed: 400 }, function(slideshow) { });
 */
function swiperLazyInit(swiperContainer, parameters, callback) {
    if (window.Swiper) {
        // fix with init to break up the creation and initialization of the swiper in two parts
        // allowing execution of other javascript in between
        if (!parameters) {
            parameters = {};
        }
        var initBreakMode = false;
        if (parameters.init === undefined || parameters.init === true) {
            parameters.init = false;
            parameters.preloadImages = false;
            initBreakMode = true;
        }
        // create
        console.time("Creating Swiper " + swiperContainer.toString());
        var swiper = new Swiper(swiperContainer, parameters);
        console.timeEnd("Creating Swiper " + swiperContainer.toString());
        if (initBreakMode) {
            setTimeout(function () {
                console.time("Initing Swiper " + swiperContainer.toString());
                swiper.init();
                //setTimeout(function () { swiper.preloadImages(); }, 0);
                console.timeEnd("Initing Swiper " + swiperContainer.toString());
                if (callback) {
                    callback(swiper);
                }
            }, 0);
        }
        else if (callback) {
            callback(swiper);
        }
    }
    else {
        setTimeout(function () { swiperLazyInit(swiperContainer, parameters, callback); }, 50);
    }
}