Crystal Reports Viewer too slow in Eclipse

Crsytal reports is too slow in JAVA when executing method processHttpRequest (Tomcat 9, Java 13).

With slow I mean that one report un Cristal editor takes approx 5 minutes to show it. When you execute it in crystal reports visor it takes more than 45 minutes. When I execute for second time there’s a difference of 2-3 minutes. I don’t understand why there’s too many difference between editor vs visor for eclipse.

Note: This report have approx 400 pages

My code:

Fields fields = (Fields) request.getSession().getAttribute("fields"); 
String separarPaginasReporte = request.getParameter("separarPaginasReporte"); 
//String separarPaginasReporte = (String) request.getSession().getAttribute("separarPaginasReporte"); 
IReportSource reportSource = (IReportSource) request.getSession().getAttribute("reportSource"); 
//create the CrystalReportViewer object CrystalReportViewer
oCrystalReportViewer = new CrystalReportViewer(); 
//set the reportsource property of the viewer oCrystalReportViewer.setParameterFields(fields); oCrystalReportViewer.setReportSource(reportSource); 
//set viewer attributes oCrystalReportViewer.setOwnPage(true); 
oCrystalReportViewer.setOwnForm(true); 
oCrystalReportViewer.setDisplayGroupTree(false); 
oCrystalReportViewer.setEnableDrillDown(false); 
oCrystalReportViewer.setHasLogo(false);
oCrystalReportViewer.setSeparatePages((request.getParameter("separarPaginasReporte") != null && request.getParameter("separarPaginasReporte").equalsIgnoreCase("N")) ? false : true); 
oCrystalReportViewer.setHasToggleGroupTreeButton(false); 
oCrystalReportViewer.setHasToggleParameterPanelButton(false); 
//set the CrystalReportViewer print mode 
oCrystalReportViewer.setPrintMode(CrPrintMode.ACTIVEX); 
oCrystalReportViewer.processHttpRequest(request, response,getServletConfig().getServletContext(), null); 
reportSource.dispose(); 
request.getSession().setAttribute("fields",null); 
request.getSession().setAttribute("reportSource",null);