<div class="progress"></div>

body {
  background-color: #000;
  color: #fff;
  text-align: center;
}

.progress {
  background: red;
  display: block;
  height: 20px;
  text-align: center;
  transition: width .3s;
  width: 0;
}

.progress.hide {
  opacity: 0;
  transition: opacity 1.3s;
}

var data = [];
for (var i = 0; i < 100000; i++) {
    var tmp = [];
    for (var i = 0; i < 100000; i++) {
        tmp[i] = 'hue';
    }
    data[i] = tmp;
};
$.ajax({
    xhr: function () {
        var xhr = new window.XMLHttpRequest();
        xhr.upload.addEventListener("progress", function (evt) {
            if (evt.lengthComputable) {
                var percentComplete = evt.loaded / evt.total;
                console.log(percentComplete);
                $('.progress').css({
                    width: percentComplete * 100 + '%'
                });
                if (percentComplete === 1) {
                    $('.progress').addClass('hide');
                }
            }
        }, false);
        xhr.addEventListener("progress", function (evt) {
            if (evt.lengthComputable) {
                var percentComplete = evt.loaded / evt.total;
                console.log(percentComplete);
                $('.progress').css({
                    width: percentComplete * 100 + '%'
                });
            }
        }, false);
        return xhr;
    },
    type: 'POST',
    url: "/echo/html",
    data: data,
    success: function (data) {}
});