如何提高jquery组合框的性能？

Question

我在asp.net mvc视图中使用jquery组合框小部件，我对jquery很新，所以任何人都可以帮我改进组合框的性能，我的意思是在页面加载时不加载所有列表，或类似的东西？!!我在asp.net mvc视图中使用jquery组合框小部件，因为我对jquery很新，所以任何人都可以帮助我如何提高组合框的性能吗？！

e   $(function () {
        $.widget("custom.combobox", {
            _create: function () {
                this.wrapper = $("<span>")
                  .addClass("custom-combobox")
                  .insertAfter(this.element);

                this.element.hide();
                this._createAutocomplete();
                this._createShowAllButton();
            },

            _createAutocomplete: function () {
                var selected = this.element.children(":selected"),
                  value = selected.val() ? selected.text() : "";

                this.input = $("<input>")
                  .appendTo(this.wrapper)
                  .val(value)
                  .attr("title", "")
                  .addClass("custom-combobox-input ui-widget ui-widget-content ui-state-default ui-corner-left")
                  .autocomplete({
                      delay: 0,
                      minLength: 0,
                      source: $.proxy(this, "_source")
                  })
                  .tooltip({
                      classes: {
                          "ui-tooltip": "ui-state-highlight"
                      }
                  });

                this._on(this.input, {
                    autocompleteselect: function (event, ui) {
                        ui.item.option.selected = true;
                        this._trigger("select", event, {
                            item: ui.item.option
                        });
                    },

                    autocompletechange: "_removeIfInvalid"
                });
            },

            _createShowAllButton: function () {
                var input = this.input,
                  wasOpen = false;

                $("<a>")
                  .attr("tabIndex", -1)
                  .attr("title", "")
                  .tooltip()
                  .appendTo(this.wrapper)
                  .button({
                      icons: {
                          primary: "ui-icon-triangle-1-s"
                      },
                      text: false
                  })
                  .removeClass("ui-corner-all")
                  .addClass("custom-combobox-toggle ui-corner-right")
                  .on("mousedown", function () {
                      wasOpen = input.autocomplete("widget").is(":visible");
                  })
                  .on("click", function () {
                      input.trigger("focus");

                      // Close if already visible
                      if (wasOpen) {
                          return;
                      }

                      // Pass empty string as value to search for, displaying all results
                      input.autocomplete("search", "");
                  });
            },

            _source: function (request, response) {
                var matcher = new RegExp($.ui.autocomplete.escapeRegex(request.term), "i");
                response(this.element.children("option").map(function () {
                    var text = $(this).text();
                    //Here needs changes
                    //if (this.value && (!request.term || matcher.test(text)))
                    if (this.value && (!request.term || matcher.test(text.split("|")[0])))
                        return {
                            label: text,
                            value: text,
                            option: this
                        };
                }));



            },



            _removeIfInvalid: function (event, ui) {
                // Selected an item, nothing to do
                if (ui.item) {
                    return;
                }
                // Search for a match (case-insensitive)
                var value = this.input.val(),
                  valueLowerCase = value.toLowerCase(),
                  valid = false;
                this.element.children("option").each(function () {
                    if ($(this).text().toLowerCase() === valueLowerCase) {
                        this.selected = valid = true;
                        return false;
                    }
                });

                // Found a match, nothing to do
                if (valid) {
                    return;
                }

                // Remove invalid value
                this.input
                  .val("")
                  .attr("title", value + " didn't match any item")
                  .tooltip("open");
                this.element.val("");
                this._delay(function () {
                    this.input.tooltip("close").attr("title", "");
                }, 2500);
                this.input.autocomplete("instance").term = "";
            },

            _destroy: function () {
                this.wrapper.remove();
                this.element.show();
            }
        });

        $("#combobox").combobox();
        $("#toggle").on("click", function () {
            $("#combobox").toggle();
        });



    });



                @Html.DropDownList("combobox", ViewBag.CategoryListNew as IEnumerable<SelectListItem>, "--Select category  --", new { @class = "form-control " })