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
{
			File resourceFile = new File( resourcePath );
			if ( !resourceFile.exists( ) )
			{
				isResourceOk = resourceFile.mkdirs( );
			}
		}
		if ( isResourceOk )
		{
			SessionHandle.setBirtResourcePath( resourcePath );
		}
		
		imageDirectory = servletConfig.getServletContext( ).getInitParameter(
				ParameterAccessor.INIT_PARAM_IMAGE_DIR );
		if ( imageDirectory == null || imageDirectory.trim( ).length( ) <= 0
				|| ParameterAccessor.isRelativePath( imageDirectory ) )
		{
			imageDirectory = servletConfig.getServletContext( ).getRealPath(
					"/report/images" ); 
		}
		
		imageBaseUrl = "/run?__imageID="; 
		
		String logDirectory = servletConfig.getServletContext( )
				.getInitParameter( ParameterAccessor.INIT_PARAM_LOG_DIR );
		if ( logDirectory == null || logDirectory.trim( ).length( ) <= 0
				|| ParameterAccessor.isRelativePath( logDirectory ) )
		{
			logDirectory = servletConfig.getServletContext( ).getRealPath(
					"/logs" );