I am using ZuckerReports_1.14_module from SugarForge.

In order to export Excel2007(.xlsx) format, I did a little modification to implement this export format.

1) Open file "modules/ZuckerReportTemplate/ReportTemplate.php", and add IF statement in function execute():
PHP Code:
if ($format == 'XLSX') {
       
$this->report_result_name $date."_".$base.".xlsx";

2) Open file "modules/ZuckerReportTemplate/language/en_us.lang.php", here I only fix English language pack, add code in "REPORT_EXPORT_TYPES" array:
PHP Code:
'XLSX' => 'Excel2007 (*.xlsx)'
3) Decompile zuckerreports-1.0.jar by JD-GUI, and add custom code "XLSX" in Java function:
PHP Code:
private static JRExporter getJRExporter() {
        
JRExporter result null;

        
String format getProperty("jasper.format");
        if ((
format == null) || (format.length() == 0) || (format.equalsIgnoreCase("PDF"))) {
            
result = new JRPdfExporter();
        } else if (
format.equalsIgnoreCase("XLS")) {
            
result = new JRXlsExporter();
        } else if (
format.equalsIgnoreCase("XLSX")) {
            
result = new JRXlsxExporter();
            
result.setParameter(JRXlsExporterParameter.IS_DETECT_CELL_TYPEBoolean.TRUE);
            
result.setParameter(JRXlsExporterParameter.IS_FONT_SIZE_FIX_ENABLEDBoolean.TRUE);
            
result.setParameter(JRXlsExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWSBoolean.TRUE);
            
result.setParameter(JRXlsExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_COLUMNSBoolean.TRUE);
        } else if (
format.equalsIgnoreCase("CSV")) {
                 ...

For now I am using jasperreports-4.1.3.jar in java classpath, this jasper release improved Excel export performance.

4) Build your custom zuckerreport jar file and replace it in "modules/ZuckerReports/jasper/zuckerreports-1.0.jar".

5) Thank you ZuckerReports