Took about 2-3 to find controller and action

Hi i have some JS code like this

                    <script type="text/javascript">
                        Billing.init('#co-billing-form', '@(storeLocation)checkout/OpcSaveCustomer/');
                        if ($("#billing-address-select").length > 0) {
                            Billing.newAddress(!$('#billing-address-select').val());
                        }
                    </script>

And on RouteProvide code like this for this URL

            routes.MapLocalizedRoute("Plugin.Misc.OnePageCheckout.OpcSaveCustomer",
                "checkout/OpcSaveCustomer/",
                new { controller = "CustomCheckout", action = "OpcSaveCustomer" },
                new[] { "Nop.Plugin.Misc.OnePageCheckout.Controllers" });

it tooks about 2 -3 sec before it comes to breakpoint on this controller to selected action

Why?What can i do for this one?