Рабочая книга XSSF занимает много времени, чтобы получить файл fileinputstream

Question

* это мой блок try, в котором я уже имел xlsx файл. Делаем в него операцию записи =========================== ================================================== ==================

 FileInputStream fis = null;
                                        Workbook workbook = null;
                                        FileOutputStream fos = null;
                                        try {
                                            fis = new FileInputStream(ExcelConstants.TEMPLATE_EXCEL.getName());
                                            workbook = new XSSFWorkbook(fis); //taking time to take file 
                                            Sheet templateSheet = workbook.getSheet(ExcelConstants.TEMPLATE_SHEET_NAME.getName());
                                            if (qeiDetails != null) {
                                                String sheetName =ExcelConstants.SHEET_NAME_PREFIX.getName()+qeiDetails.getQeiId();
                                                try {
                                                    super.cloneSheet(templateSheet, sheetName);
                                                } catch (Exception e) {
                                                    log.error("Error in downloadExcelByQei() :" + e.getStackTrace());
                                                }
                                            }
                                ============================
                                String filePath = ExcelConstants.EXCEL_TEMP_DIR.getName();
                                            fos = new FileOutputStream(filePath + fileName, false);
                                            workbook.write(fos);
                                            workbook.close();
                                            file = new File(filePath + fileName);
                                            boolean fileCreated = file.createNewFile();
                                            log.info("Inside downloadExcelByQei:fileCreated:: " + fileCreated);
                          *emphasized text*             } catch (Exception e) {
                                            log.error("Error in downloadExcelByQei() :" + e.getMessage());
                                        } 

                                        return file;
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 -suggest me how can i reduce time to load file in workbook as it is taking time to download.***