Reading input stream byte array from mime body part takes too long with java mail api

Question

Reading input stream byte array from mime body part takes 11 minutes for 25MB file.

When viewing single email, I am reading input stream byte array from MimeBodyPart, but it takes 11 minutes to read 25MB file with java mail API. How can I speed up reading input stream byte array from MimeBodyPart?

Below is the code which I am using to read,

if (message.isMimeType("multipart/*")) {
                        // //System.out.println("first if");
                        // content may contain attachments
                        Multipart multiPart = (Multipart) message.getContent();
                        int numberOfParts = multiPart.getCount();
                        for (int partCount = 0; partCount < numberOfParts; partCount++) {
                            MimeBodyPart part = (MimeBodyPart) multiPart.getBodyPart(partCount);
                                if (Part.ATTACHMENT.equalsIgnoreCase(part.getDisposition())) {
                                    // this part is attachment
                                    String fileName = part.getFileName();
                                    //final File file = new File(fileName);
                                    String[] FileType = part.getContentType().split("\\s");
                                    byte[] byteArray = part.getInputStream().readAllBytes();// Here it takes 11min 
}}}