Why my rest api call is slow while reading and writing to a file [closed]

I am trying to upload an inputstream using below code

@PutMapping(value="/fileupload", consumes={MediaType.APPLICATION_OCTET_STREAM_VALUE}pubic ResponseEntity<String> uploadFIle(InputStream stream){  log.info("start");  IOUtils.copyLarge(stream,new FileOutputStream("c:\\tmp\\test.txt");  log.info("end");}

When i try to upload a large file ~1gb using above code , It takes more time, What can be changed to improve the performance