//D:\C\WcfService3\WcfService3\Web.config
<?xml version="1.0"?>
<configuration>

    <appSettings>
        <add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
    </appSettings>
    <system.web>
        <compilation debug="true" targetFramework="4.8" />
        <httpRuntime targetFramework="4.8"/>
    </system.web>
    <system.serviceModel>
        
        <bindings>
            <webHttpBinding>
                <binding name="RestBinding"
                         maxReceivedMessageSize="2147483647"
                         maxBufferSize="2147483647">
                    <readerQuotas
                        maxStringContentLength="2147483647"
                        maxArrayLength="2147483647"/>
                </binding>
            </webHttpBinding>             
        </bindings>

        <services>
            <service name="WcfService3.BookService">
                <endpoint address=""
                          binding="webHttpBinding"
                          bindingConfiguration="RestBinding"
                          behaviorConfiguration="RestBehavior"
                          contract="WcfService3.IBookService"/>
            </service>
        </services>
        
        <behaviors>
            <serviceBehaviors>
                <behavior>
                    <!-- To avoid disclosing metadata information, set the values below to false before deployment -->
                    <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true"/>
                    <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
                    <serviceDebug includeExceptionDetailInFaults="false"/>
                </behavior>
            </serviceBehaviors>

            <endpointBehaviors>
                <behavior name="RestBehavior">
                    <webHttp/>
                </behavior>
            </endpointBehaviors>
        </behaviors>
        
        <!--<protocolMapping>
            <add binding="basicHttpsBinding" scheme="https" />
        </protocolMapping>-->
        
        <serviceHostingEnvironment aspNetCompatibilityEnabled="true" 
                                   multipleSiteBindingsEnabled="true" />
        
    </system.serviceModel>
    <system.webServer>
        <modules runAllManagedModulesForAllRequests="true"/>
        <!--
        To browse web app root directory during debugging, set the value below to true.
        Set to false before deployment to avoid disclosing web app folder information.
      -->
        <directoryBrowse enabled="true"/>
    </system.webServer>

</configuration>


//D:\C\WcfService3\WcfService3\Models\Book.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.Web;

namespace WcfService3.Models
{
    [DataContract]
    public class Book
    {
        [DataMember]
        public long Id { get; set; }

        [DataMember]
        public string Name {  get; set; }

        [DataMember]
        public string ISBN { get; set;  }

        [DataMember]
        public string Author { get; set;  }

        [DataMember]
        public string Abstract {  get; set; }

        [DataMember]
        public string Comment {  get; set; }

        [DataMember]
        public string Content {  get; set; }

        [DataMember]
        public string Summary { get; set;  }

        [DataMember]
        public string Title {  get; set; }

        [DataMember]
        public string Topic {  get; set; }
    }
}

//D:\C\WcfService3\WcfService3\IBookService.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
using WcfService3.Models;

namespace WcfService3
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IBookService" in both code and config file together.
    [ServiceContract]
    public interface IBookService
    {
        [OperationContract]
        //[WebGet(UriTemplate="GetBooksList?cnt={cnt}",RequestFormat =WebMessageFormat.Json,ResponseFormat =WebMessageFormat.Json)]
        [WebGet(UriTemplate = "GetBooksList?cnt={cnt}",
            ResponseFormat = WebMessageFormat.Json)]
        List<Book> GetBooksList(int cnt);
    }
}


//D:\C\WcfService3\WcfService3\BookService.svc.cs
using System;
using System.Collections.Generic;
using System.Dynamic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using System.Threading;
using WcfService3.Models;

namespace WcfService3
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "BookService" in code, svc and config file together.
    // NOTE: In order to launch WCF Test Client for testing this service, please select BookService.svc or BookService.svc.cs at the Solution Explorer and start debugging.
    public class BookService : IBookService
    {
        static long idx = 0;
        private long GetIncrementIdx()
        {
            return Interlocked.Increment(ref idx);
        }
        public List<Book> GetBooksList(int cnt)
        {
            List<Book> bksList = new List<Book>();
            for (int i = 0; i < cnt + 1; i++)
            {
                long a = GetIncrementIdx();
                bksList.Add(new Book()
                {
                    Id = a,
                    Name = $"Name_{a}",
                    ISBN = $"ISBN_{a}",
                    Author = $"Author_{a}",
                    Abstract = $"Abstract_{a}",
                    Comment = $"Comment_{a}",
                    Content = $"Content_{a}",
                    Summary = $"Summary_{a}",
                    Title = $"Title_{a}",
                    Topic = $"Topic_{a}"
                });
            }
            return bksList;
        }
    }
}

http://localhost:50704/BookService.svc/getbookslist?cnt=100000

<Window x:Class="WpfApp24.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp24"
        mc:Ignorable="d"
        Title="MainWindow" WindowState="Maximized">
    <Window.DataContext>
        <local:MainVM/>
    </Window.DataContext>
    <Grid>
        <ListBox ItemsSource="{Binding BooksCollection}"
                 VirtualizingPanel.IsVirtualizing="True"
                 VirtualizingPanel.VirtualizationMode="Recycling"
                 VirtualizingPanel.CacheLength="5,5"
                 VirtualizingPanel.CacheLengthUnit="Item"
                 ScrollViewer.IsDeferredScrollingEnabled="True"
                 ScrollViewer.CanContentScroll="True"
                 UseLayoutRounding="True"
                 SnapsToDevicePixels="True"
                 >
            <ListBox.Resources>
                <Style TargetType="ListBoxItem">
                    <Setter Property="FontSize" Value="20"/>
                    <Style.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="FontSize" Value="30"/>
                            <Setter Property="Foreground" Value="Red"/>
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </ListBox.Resources>
        </ListBox>
    </Grid>
</Window>

using Newtonsoft.Json;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Net;
using System.Runtime.CompilerServices;
using System.Runtime.Serialization;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Xml.Schema;

namespace WpfApp24
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
    }

    public class MainVM : INotifyPropertyChanged
    {
        public MainVM()
        {
            string url = "http://localhost:50704/BookService.svc/getbookslist?cnt=1000000";
            WebClient client = new WebClient();
            client.DownloadStringCompleted += Client_DownloadStringCompleted;
            client.DownloadStringAsync(new Uri(url));
        }

        private void Client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
        {
            var jsonStr = e.Result;
            BooksCollection=new ObservableCollection<Book>(JsonConvert.DeserializeObject<List<Book>>(jsonStr));
        }

        private ObservableCollection<Book> booksCollection;
        public ObservableCollection<Book> BooksCollection
        {
            get
            {
                return booksCollection;
            }
            set
            {
                if(value!=booksCollection)
                {
                    booksCollection = value;
                    OnPropertyChanged();
                }
            }
        }

        public event PropertyChangedEventHandler? PropertyChanged;
        private void OnPropertyChanged([CallerMemberName] string propName="")
        {
            var handler = PropertyChanged;
            handler?.Invoke(this, new PropertyChangedEventArgs(propName));
        }
    }

    [DataContract]
    public class Book
    {
        [DataMember]
        public long Id { get; set; }

        [DataMember]
        public string Name { get; set; }

        [DataMember]
        public string ISBN { get; set; }

        [DataMember]
        public string Author { get; set; }

        [DataMember]
        public string Abstract { get; set; }

        [DataMember]
        public string Comment { get; set; }

        [DataMember]
        public string Content { get; set; }

        [DataMember]
        public string Summary { get; set; }

        [DataMember]
        public string Title { get; set; }

        [DataMember]
        public string Topic { get; set; }

        public override string ToString()
        {
            return $"Id:{Id},Name:{Name},ISBN:{ISBN},Author:{Author},Comment:{Comment},Content:{Content},Summary:{Summary},Title:{Title},Topic:{Topic}";
        }
    }
}