Bug 137176 It takes unacceptable long time to render a report
Description: Get the attached report design, preview in report designer. It takes unacceptable long time to render a report, and users could not get the output finally. Even during the rending, the computer could not do anything else.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java
protected void __initParameters( HttpServletRequest request )
			throws Exception
	{
		this.reportDesignHandle = getDesignHandle( request );
		
		if ( isDesigner )
		{
			this.parseConfigVars( request );
		}
		InputOptions options = new InputOptions( );
		options.setOption( InputOptions.OPT_REQUEST, request );
		options.setOption( InputOptions.OPT_LOCALE, locale );
		options.setOption( InputOptions.OPT_RTL, new Boolean( rtl ) );
		Collection parameterList = this.getReportService( )
				.getParameterDefinitions( reportDesignHandle, options, false );
		
		this.parameters = (HashMap) getParsedParameters( reportDesignHandle,
				parameterList, request, options );
		this.missingParameter = validateParameters( parameterList,
				this.parameters );
	}
	/**
	 * parse paramenters from config file.
	 * 
	 * @param request
	 * @return
	 */
	protected void parseConfigVars( HttpServletRequest request )
	{