javascript - AJAX loaded event getting incorrect result -


i uploading form data containg files using ajax , trying progress bar uploading data.

on listening progress event getting correct response total amounting file size in form data.

but loaded response going faster expected. 1.5 gb payload getting loaded response after minute absurd. , getting success response long after. why getting incorrect loaded response?

$.ajax({     xhr: function() {          var xhr = new window.xmlhttprequest();          xhr.upload.addeventlistener("progress", function(evt) {          if (evt.lengthcomputable) {               var percentcomplete = ((evt.loaded / evt.total) * 100);               percentcomplete = math.round(number(percentcomplete));                                                   $("#progresspercentage").text(percentcomplete + "%");             }         }, false);         return xhr;     },     url: "/ls/livespace/broadcasts.save",     type: 'post',     data: formdata,     async: true,     cache: false,     beforesend: function() {},     success: function (data) {}     });


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