MessagePacker#packString is slow when outputting to FileOutputStream #292

    private static void packStrings(String label, String s, int count, OutputStream outputStream)
            throws IOException
    {
        System.out.println(label);
        MessagePacker messagePacker = MessagePack.newDefaultPacker(outputStream);
        long start = System.currentTimeMillis();
        for (int i = 0; i < count; i++) {
            messagePacker.packString(s);
        }
        messagePacker.close();
        System.out.println(System.currentTimeMillis() - start);
    }

    public static void main(String[] args)
            throws IOException
    {
        int count = 5000000;
        String s = "0123456789";
        packStrings("ByteArrayOutputStream", s, count, new ByteArrayOutputStream());
        packStrings("FileOutputStream", s, count, new FileOutputStream("/tmp/x.bin"));
        packStrings("FileOutputStream + BufferedOutputStream", s, count, new BufferedOutputStream(new FileOutputStream("/tmp/x.bin")));
    }

ByteArrayOutputStream
1056
FileOutputStream
19084
FileOutputStream + BufferedOutputStream
854