IIS加载报表查看器缓慢

我们正在运行IIS &;SSRS在同一生产服务器上，并且有两种类型的报表—一种通过报表查看器运行，连接到SSRS(远程模式)，另一种调用SSRS web服务生成pdf。

对于这两种报告类型，在加载页面时变得非常慢，最多需要20秒。这在服务器负载较重的时期最为明显，在IIS中回收应用程序池后，缓慢会消失，但过一段时间后又会恢复(应用程序池被设置为每天凌晨3点回收)。

我检查了SSRS的执行日志-对于所有报告，数据检索+处理+呈现的时间将不超过2秒，SSRS的http日志表明，当页面变得无响应时，没有来自IIS的请求-一旦请求到达，它加载得非常快。通过报表管理器运行的报表也非常快。

SSRS似乎不是罪魁祸首，似乎是IIS中的某些东西引起的。

有没有人遇到过类似的问题，或者可以给我指出正确的诊断方向?

许多谢谢。

---

ReportViewer:

public abstract class ReportPageBase : System.Web.UI.Page
{
    protected void GenerateReport(ReportViewer reportViewer)
    {
        var reportParameters = new List<ReportParameter>();
        reportViewer.Visible = true;
        reportViewer.ServerReport.ReportServerUrl = new Uri(Util.ReportServerUrl);
        reportViewer.ServerReport.ReportServerCredentials = new ReportServerCredentials();
        ParametersOverride(ref reportParameters);
        reportViewer.ServerReport.SetParameters(reportParameters);
    }
    protected abstract void ParametersOverride(ref List<ReportParameter> reportParameters);
}

Web服务:

public static class ReportExporter
{
    public static Stream GetExportStream(string reportName, string format, ReportExecutionService.ParameterValue[] paramVals)
    {
        var rs = new ReportingService2005SoapClient();
        var rsExec = new ReportExecutionServiceSoapClient();
        var username = ConfigurationManager.AppSettings["ReportViewerUser"];
        var password = ConfigurationManager.AppSettings["ReportViewerPassword"];
        var domain = ConfigurationManager.AppSettings["ReportViewerDomain"];
        var folderPath = ConfigurationManager.AppSettings["ReportViewerFoler"];
        System.Net.NetworkCredential networkCredential = new System.Net.NetworkCredential(username, password, domain);
        rs.ClientCredentials.Windows.ClientCredential = networkCredential;
        rsExec.ClientCredentials.Windows.ClientCredential = networkCredential;
        rs.ClientCredentials.Windows.AllowedImpersonationLevel = System.Security.Principal.TokenImpersonationLevel.Impersonation;
        rsExec.ClientCredentials.Windows.AllowedImpersonationLevel = System.Security.Principal.TokenImpersonationLevel.Impersonation;
        var _reportName = (folderPath ?? @"/") + reportName.Trim();
        string historyID = null;
        // gets the parameters
        rs.GetReportParameters(_reportName, historyID, forRendering, values, credentials, out parameters);
        // load the report
        ExecutionInfo executionInfo = null;
        ReportExecutionService.ServerInfoHeader serverInfoHeader = null;
        ExecutionHeader header = new ExecutionHeader();
        rsExec.LoadReport(null, _reportName, historyID, out serverInfoHeader, out executionInfo);
        header.ExecutionID = executionInfo.ExecutionID;
        rsExec.SetExecutionParameters(header, null, paramVals, "en-us", out executionInfo);
        byte[] result = null;
        string[] streamIds = null;
        string encoding = String.Empty;
        string mimeType = String.Empty;
        string extension = String.Empty;
        ReportExecutionService.Warning[] warnings = null;
        rsExec.Render(header,
                      null,
                      format,
                      null,
                      out result,
                      out extension,
                      out mimeType,
                      out encoding,
                      out warnings,
                      out streamIds);
        var memstream = new MemoryStream(result);
        return memstream;
    }
}