สอบถามเกี่ยวกับการส่งข้อมูลด้วย ajax post ขนาดใหญ่ครับ

    function merge_image() {
        $("#show_display").empty();
        html2canvas([document.getElementById('box_display')], {
            onrendered: function (canvas) {
                var cap_image = canvas.toDataURL('image/jpg');

                var formData = new FormData();
                formData.append('value', cap_image);
                formData.append('game_id', game_id);

                jQuery.ajax({
                    url: "<?php echo base_url().$this->router->class."/set_file2";?>",
                    type: "POST",
                    //data: {image:cap_image,game_id:game_id},
                    data: formData,
                    cache: false,
                    contentType: false,
                    processData: false,
                    beforeSend: function () {
                        $('#loading').show();
                        $('#get_loading').hide();

                    },
                    success: function (result) {
                        $('#loading').hide();
                        $('#get_loading').show();
                        //postToFeed(result);
                        alert(result);
                    }
                });

            }
        });
    }