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protected override object LoadPageStateFromPersistenceMedium()
    {
        object viewStateBag;
        string m_viewState = (string)Session["ViewState"];
        LosFormatter m_formatter = new LosFormatter();
        try
        {
            viewStateBag = m_formatter.Deserialize(m_viewState);
        }
        catch
        {
            return null; // throw new HttpException("The View State is invalid.");
        }
        return viewStateBag;
    }
    protected override void SavePageStateToPersistenceMedium(object viewState)
    {
        MemoryStream ms = new MemoryStream();
        LosFormatter m_formatter = new LosFormatter();
        m_formatter.Serialize(ms, viewState);
        ms.Position = 0;
        StreamReader sr = new StreamReader(ms);
        string viewStateString = sr.ReadToEnd();
        Session["ViewState"] = viewStateString;
        ms.Close();
        return;
    }

Christopher Duncan wrote:

However, our company has one heavily database oriented app that suffers
significant performance problems, enough to disrupt operations. I want to get it
done quickly, but it also needs to hold up under a heavy load.
 

A couple of gigs ago, we replaced an admittedly bad ASP.Net site with an MVC4/Razor site. It was a handful of SPAs using partial views and Ajax post-backs. Blindingly fast and a much better user experience - go for it!