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/service/ReportEngineService.java
HashMap context = new HashMap( );
		
		context.put( "org.eclipse.birt.data.engine.dataset.cache.option", 
				Boolean.TRUE );
		context.put( EngineConstants.APPCONTEXT_BIRT_VIEWER_HTTPSERVET_REQUEST,
				request );
		context.put( EngineConstants.APPCONTEXT_CLASSLOADER_KEY,
				ReportEngineService.class.getClassLoader( ) );
		if ( ParameterAccessor.PARAM_FORMAT_PDF.equalsIgnoreCase( format ) )
		{
			context.put( EngineConstants.APPCONTEXT_PDF_RENDER_CONTEXT,
					createPDFrenderContext( ) );
		}
		else if ( htmlRenderContext != null )
		{
			context.put( EngineConstants.APPCONTEXT_HTML_RENDER_CONTEXT,
					htmlRenderContext );
		}
		else
		{
			context
					.put( EngineConstants.APPCONTEXT_HTML_RENDER_CONTEXT,
							createHTMLrenderContext( svgFlag, request
									.getServletPath( ) ) );
		}
		runAndRenderTask.setAppContext( context );
		try
		{
			runAndRenderTask.run( );
		}