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/utility/ParameterAccessor.java
* URL parameter name that determines whether to overwrite the document or
	 * not.
	 */
	public static final String PARAM_OVERWRITE = "__overwrite"; 
	/**
	 * URL parameter name that gives the image ID to display.
	 */
	public static final String PARAM_IMAGEID = "__imageID"; 
	/**
	 * URL parameter name that gives the bookmark expression.
	 */
	public static final String PARAM_BOOKMARK = "__bookmark"; 
	/**
	 * URL parameter name that gives that image rtl option.
	 */
	public static final String PARAM_RTL = "__rtl"; 
	/**
	 * Custom request headers to identify the request is a normal HTTP request
	 * or a soap request by AJAX.
	 */
	public static final String HEADER_REQUEST_TYPE = "request-type"; 
	/**
	 * The request type of "soap".
	 */
	public static final String HEADER_REQUEST_TYPE_SOAP = "soap"; 
	/**
	 * Parameter name that gives the IID of the export data form.
	 */
	public static final String PARAM_IID = "iid"; 
	/**