how to delay loading many update panels??

[router.exe]

I'm creating a dashboard, and i've decided to put all my asp charts into their own update panels because loading at once takes too long. the goal is to have them load in a sequential order.

the update panels are created programatically when the page loads. There is data related to the report stored in DataTable, myDT.

I am using a timer to wait 2 seconds before starting this process. once the process starts though, it behaves as though i am loading all update panels at one time. What am i doing wrong, or what do i need to add?

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    
    <asp:PlaceHolder ID="PlaceHolder1" runat="server" ViewStateMode="Enabled"></asp:PlaceHolder>
    
    <asp:Timer ID="Timer1" runat="server" Interval="2000">
    </asp:Timer>

    <script type="text/javascript">
        $(document).ready(function () {
            $('.tabs').tabs();
        });
    </script>    
</asp:Content>

protected void Timer1_Tick(object sender, EventArgs e)
        {
            Timer1.Enabled = false;
            try
            {
               
                var query = from t in this.myDT.AsEnumerable()
                            select new
                            {
                                RunScheduleID = t["RunScheduleID"],
                                PBuild = t["ProductBuild"],
                                StartDate = t["StartDate"],
                                EndDate = t["EndDate"]
                            };

                int rms = 0;

                foreach (var q in query)
                {
                    UpdatePanel p = (UpdatePanel)PlaceHolder1.FindControl("up_" + rms.ToString());

                    PlaceHolder ph = (PlaceHolder)PlaceHolder1.FindControl("ph_" + rms.ToString());
                    
                    System.Threading.Thread.Sleep(4000); // simulate time it takes to run process

                    ph.Controls.Clear();
                    p.Update();
                }
}
Catch (Exception ex)
{
throw ex;
}
)