WatiN testing ASP.NET - app startup time issues

I started a test project to test a web app. One thing I noticed was that due to application startup, occasionally the first couple of tests fail with TimeoutExceptions because the application takes too long to compile some of the pages.

So, I came up with the following to work around this:

using SHDocVw;
using WatiN.Core;
using WatiN.Core.Exceptions;

namespace Tests {
    public class TestBase {
        private static bool _siteSetupRun = false;

        public TestBase() {
            if (!_siteSetupRun) {
                setupSite();
                _siteSetupRun = true;
            }
        }

        private static void setupSite() {
            bool ok = false;
            using (IE ie = new IE()) {
                object nil = null;
                ((InternetExplorer)ie.InternetExplorer).Navigate("http://testsite/",
                    ref nil, ref nil, ref nil, ref nil);
                while (!ok) {
                    try {
                        ie.WaitForComplete();
                        ok = true;
                    } catch (TimeoutException tex) {
                        if (!tex.Message.Contains("'Internet Explorer busy'")) {
                            throw;
                        }
                    }
                }
            }
        }
    }
}

This needs to run before any unit tests.