How to Minify HTML output from ASP.NET MVC

You can use https://developers.google.com/speed/pagespeed/insights/?hl=en to  check the performance of your websites

First you need to download Minifier Html tool from https://github.com/deanhume/html-minifier

This is a simple command line tool to minify your HTML, Razor views & Web Forms views. By minifying your HTML on bigger web pages, you'll save on bytes that your clients need to download.

Open Properties->PublishProfiles->Open your pubxml extension file

Add HtmlMinifier.exe to your publishing profile

<?xml version="1.0" encoding="utf-8"?>
<!--
This file is used by the publish/package process of your Web project. You can customize the behavior of this process
by editing this MSBuild file. In order to learn more about this please visit https://go.microsoft.com/fwlink/?LinkID=208121. 
-->
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <WebPublishMethod>FileSystem</WebPublishMethod>
    <PublishProvider>FileSystem</PublishProvider>
    <LastUsedBuildConfiguration>Release</LastUsedBuildConfiguration>
    <LastUsedPlatform>Any CPU</LastUsedPlatform>
    <SiteUrlToLaunchAfterPublish />
    <LaunchSiteAfterPublish>True</LaunchSiteAfterPublish>
    <PrecompileBeforePublish>True</PrecompileBeforePublish>
    <EnableUpdateable>True</EnableUpdateable>
    <DebugSymbols>False</DebugSymbols>
    <WDPMergeOption>DonotMerge</WDPMergeOption>
    <ExcludeApp_Data>True</ExcludeApp_Data>
    <publishUrl>D:\Publish\Test</publishUrl>
    <DeleteExistingFiles>True</DeleteExistingFiles>
  </PropertyGroup>
  <Target Name="CustomAction" AfterTargets="CopyAllFilesToSingleFolderForPackage">
    <Message Text="Minifying files....." />
    <Exec Command="D:\Publish\HtmlMinifier.exe $(_PackageTempDir)" IgnoreExitCode="true" />
  </Target>
</Project>

Note: Copy HtmlMinifier.exe to your publishing project directory, then publish your project

For example: Original html file

<h2>
    foxlearn.com
</h2>
<ul>
    <li>@Html.ActionLink("Home", "Index", "Home")</li>
</ul>

After Minifying the html file

<h2>foxlearn.com</h2><ul><li>@Html.ActionLink("Home", "Index", "Home")</li></ul>

I hope you can optimize your site's performance by using the HtmlMinifier tool