Low performance of .7z files with password about sevenzip HOT 2 CLOSED

func extractFile(file *sevenzip.File, target string) error {
	_f, err := os.OpenFile(target, os.O_CREATE, file.Mode())
	if err != nil {
		return err
	}
	defer _f.Close()

	fReader, err := file.Open()
	if err != nil {
		return err
	}
	defer fReader.Close()

	_, err = io.Copy(_f, fReader)

        return err
}

func extract7zArchive(archive string, path string, password string) error {
	reader, err := sevenz.OpenReaderWithPassword(archive, password)
	if err != nil {
		return err
	}
	defer reader.Close()

	for _, f := range reader.File {
		target := PathAppend(path, f.Name)
		// seems no flag to check if f is directory, but it will end with / if is directory
		if IsStrEndWith(f.Name, "/", true) {
			if err := os.MkdirAll(target, f.Mode()); err != nil {
				return err
			}
		} else {
                	pre := time.Now().UnixMilli()
                	if err = extractFile(f, target); err != nil {
                                return err
                        }
                	LogInfo("%d ms cost open %s", time.Now().UnixMilli()-pre, f.Name)
		}
	}

	return nil
}