Upper limit to LoadControl / user controls (ascx)

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ASP.NET

controls

I'm trying to find some information suggesting best practices regarding the use of usercontrols. Imagine you have a GridControl with a TemplateField which in turn loads a control.

public class GridColumnTemplateCommand : ITemplate
{
    #region ITemplate Members
    public void InstantiateIn(Control container)
    {
        if (HttpContext.Current.CurrentHandler is Page)
        {
            Page page = (Page)HttpContext.Current.CurrentHandler;
            Control cActionCell = page.LoadControl(@"~\Shared\Controls\ControlShoppingListTableCellAction.ascx");
            container.Controls.Add(cActionCell);
        }
    }
    #endregion
}

This would mean that LoadControl occurs for every cell. If this grid was bound to a sufficiently large dataset I am concerned about performance. My gut says convert to a server control, but I can't find evidence to support this. Can anyone poine me to any information confirming my gut instinct?