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我有一个带有表单身份验证(用户名和密码)的 Web 应用程序(.net 4.0)。我一直在尝试找出登录缓慢的问题,并得出结论,在初始登录时,页面需要 20-50 秒才能登录,并且每次后续登录(注销和重新登录)平均需要3秒。是什么导致首次登录需要这么长时间?大多数用户每天只会登录一次网站,所以这看起来网站很慢,而实际上它似乎只是初始登录。

 <asp:Login ID="Login1"
   CssClass="login"
   runat="server"
   InstructionText="Please enter your information."
   CheckBoxStyle - CssClass="loginRememberMe"
   RememberMeText="Remember Me"
   width="300px"
   Height="150px"
   onloggingin="Login1_LoggingIn"
   onauthenticate="Login1_Authenticate">

   <TitleTextStyle CssClass="loginHeader" /> 
   <TextBoxStyle CssClass="loginInput" />
   <LoginButtonStyle CssClass="loginButton" />
   <InstructionTextStyle Font - Italic="True" ForeColor="Black" / >

 </asp:Login>


protected void Login1_Authenticate(object sender, AuthenticateEventArgs e)
{
    Login login = (Login)loginview1.FindControl("Login1");
    MembershipProvider prov = Membership.Providers["AspNetSqlMembershipProvider"];
    if (prov.ValidateUser(login.UserName, login.Password))
    {
        e.Authenticated = true;

        AuthenticatedUser.ConnectionString = "PortalConnectionString";
        AuditUserLogin(login.UserName, true);

    }
    else
    {
        AuditUserLogin(login.UserName, false);
        e.Authenticated = false;
    }
}

private void AuditUserLogin(string Username, bool Authenticated)
{
    AuditLog.LogUserLoginAttempt(Username, Authenticated, getIP());
}

protected void Login1_LoggingIn(object sender, LoginCancelEventArgs e)
{
  //todo
}
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