解决最小化关键请求深度 - 页面性能

Question

我的问题

对于我的Web应用程序，页面的初始加载需要20秒以上。在Chrome上 - 审核-LightHouse显示以下信息。

我不知道如何解决这个问题，以加快我的页面加载速度。我已经和你呆了很长时间了。

我在下面放置了一些关于如何在我的部分布局和主页面中捆绑和渲染包的详细信息。任何帮助都非常感谢。

下面是我的js和css文件的捆绑。

  bundles.Add(new ScriptBundle("~/bundles/jquery").Include(
                    "~/Scripts/jquery-{version}.js"));/*2.1.1*/

        bundles.Add(new ScriptBundle("~/bundles/jqueryval").Include(
                    "~/Scripts/jquery.validate*"));

        bundles.Add(new ScriptBundle("~/bundles/jqueryui").Include(
                    "~/Scripts/jquery-ui.js"));

        // Use the development version of Modernizr to develop with and learn from. Then, when you're
        // ready for production, use the build tool at https://modernizr.com to pick only the tests you need.
        bundles.Add(new ScriptBundle("~/bundles/modernizr").Include(
                    "~/Scripts/modernizr-*"));

        bundles.Add(new ScriptBundle("~/bundles/bootstrap").Include(
                  "~/Scripts/bootstrap.min.js",
                  "~/Scripts/respond.min.js"));

        bundles.Add(new ScriptBundle("~/bundles/signalConnect").Include(
                  "~/Scripts/SignalScripts/SignalConnectScript.js"));


        bundles.Add(new ScriptBundle("~/Content/sliderpips").Include(
                  "~/Content/jQuery_Slider_Pips/js/jquery-ui-slider-pips.js"));//,
                                                                               //"~/Scripts/respond.js"));

        bundles.Add(new ScriptBundle("~/bundles/highcharts").Include(
                  "~/Scripts/HighCharts/highcharts.js",
                  "~/Scripts/HighCharts/highcharts-more.js",
                  "~/Scripts/HighCharts/exporting.js")
                  );


        bundles.Add(new ScriptBundle("~/Content/TinyDateTimePicker").Include(
                 "~/Content/TinyDateTimePicker/demo/events.js",
                 "~/Content/TinyDateTimePicker/calendar.js",
                 "~/Content/TinyDateTimePicker/datePicker.js",
                 "~/Content/TinyDateTimePicker/tinyDateTimePicker.js")
                 );



        bundles.Add(new ScriptBundle("~/bundles/signalgen").Include(
                    "~/Scripts/SignalScripts/SignalGenScript.js"));

        bundles.Add(new ScriptBundle("~/bundles/signaldata").Include(
                    "~/Scripts/SignalScripts/SignalDataScript.js"));

        bundles.Add(new ScriptBundle("~/bundles/signaldatacompare").Include(
                    "~/Scripts/SignalScripts/SignalScript.js"));

        bundles.Add(new ScriptBundle("~/bundles/signaldatareport").Include(
                    "~/Scripts/SignalScripts/SignalReportScript.js"));

        bundles.Add(new ScriptBundle("~/bundles/signaldataalarm").Include(
                    "~/Scripts/SignalScripts/SignalAlarmScript.js"));

        bundles.Add(new ScriptBundle("~/bundles/signalmaster").Include(
                    "~/Scripts/SignalScripts/SignalMasterScript.js",
                    "~/Scripts/Misc/jscolor.js"));

        //bundles.Add(new ScriptBundle("~/bundles/highcharts").IncludeDirectory("~/Scripts/HighCharts","*.js"));


        bundles.Add(new StyleBundle("~/Content/css").Include(
                  "~/Content/bootstrap.css",
                  "~/Content/site.css"//,

                  ));

        bundles.Add(new StyleBundle("~/Content/papercss").Include(
                   "~/Content/assets/css/paper-dashboard.css",
                   // "~/Content/assets/css/themify-icons.css",
                  //"~/Content/Custom/site_layout/css/bootstrap-responsive.min.css"//,
                  "~/Content/Custom/site_layout/css/site_layout.css"
                  //"~/Content/3rdCss/flick/jquery-ui.css",
                  //"~/Content/3rdCss/smoothness/jquery-ui.css"
                  ));

        bundles.Add(new StyleBundle("~/Content/jqueryUIcss").Include(
                 "~/Content/jqueryui.min.css"));

        bundles.Add(new StyleBundle("~/Content/sliderpipscss").Include(
                 "~/Content/jQuery_Slider_Pips/css/jquery-ui-slider-pips.css"));

        bundles.Add(new StyleBundle("~/Content/TinyDateTimePickercss").Include(
                 "~/Content/TinyDateTimePicker/datePicker.css",
                 "~/Content/TinyDateTimePicker/themes/white/datePicker.css"));

在我的_Layout.cshtml中

在部分视图的开头（_Lyout.cshtml），我已经呈现了以下内容

<title>@ViewBag.Title - Dashboard - IO </title>
@Styles.Render("~/Content/css")

@Scripts.Render("~/bundles/modernizr")

在部分视图（_Layout.cshtml）的末尾，我已经呈现了以下脚本

 @Scripts.Render("~/bundles/jquery")
@Scripts.Render("~/bundles/jqueryui")
@Scripts.Render("~/bundles/bootstrap")
@Scripts.Render("~/bundles/signalgen")

@RenderSection("Scripts", required: false)
@Scripts.Render("~/bundles/jqueryval")
@Scripts.Render("~/bundles/highcharts")</body>

在我的index.cshtml中，我在结束视图中有以下代码

@section scripts{

@Styles.Render("~/Content/jqueryUIcss")
@Styles.Render("~/Content/sliderpipscss")
@Scripts.Render("~/Content/sliderpips")


@*<!- -SignalR- ->*@
<script src="~/Scripts/jquery.signalR-2.2.2.min.js"></script>
<script src="~/SignalR/hubs"></script>
@Scripts.Render("~/bundles/signalConnect")

<script type="text/javascript">
        $(document).ready(function () {
            var dModel = @Html.Raw(Json.Encode(Model));
            prepareSignalData(dModel);


        });

</script>}

Answer 1

• 延迟/异步非关键的js。
• 合并css / js文件以最小化请求。
• 预先连接外部域，例如： <link href ='fonts.googleapis.com'rel =''预先连接'crossorigin>
• 预加载css / js，例如： <！ - 预加载资源-------------------------------------------- ------ - > <link rel =“preload”href =“http://www.pagespeedinsights.org/theme/css/normalize.css”as =“style”> <link rel =“preload” href =“http://www.pagespeedinsights.org/theme/css/skeleton.css”as =“style”> <link rel =“preload”href =“http://www.pagespeedinsights.org/theme/css /custom.css“as =”style“>

  <!-- FONT
  –––––––––––––––––––––––––––––––––––––––––––––––––– -->
  <link href='//fonts.googleapis.com/css?family=Raleway:400,300,600' rel='stylesheet' type='text/css'>
  
  <!-- CSS
  –––––––––––––––––––––––––––––––––––––––––––––––––– -->
  <link rel="stylesheet" href="http://www.pagespeedinsights.org/theme/css/normalize.css">
  <link rel="stylesheet" href="http://www.pagespeedinsights.org/theme/css/skeleton.css">
  <link rel="stylesheet" href="http://www.pagespeedinsights.org/theme/css/custom.css" >