Why Pull operations is so Slow?

Hi all, I'm new and I'm developing using this library. I have some problem with pull operations. This is my code:

 Debug.Write("Pulling branch. . .");
            LibGit2Sharp.PullOptions options = new LibGit2Sharp.PullOptions();
            options.FetchOptions = new FetchOptions();
            options.FetchOptions.CredentialsProvider = new CredentialsHandler(
                (url, usernameFromUrl, types) =>
                    new UsernamePasswordCredentials()
                    {
                        Username = this.Username,
                        Password = this.Password
                    });
            Signature author = new Signature(this.Username, this.EmailUser, DateTime.Now);
            Commands.Pull(Repo, author, options);
            Debug.Write("Pulling done.");

I don't uderstand why Pulling ONE FILE (txt 1kb) is so SLOW. Is there anyone help me?

從 Commands.Pull 呼叫以及 FetchOptions 和 CredentialsProvider 的設定開始。分別測量 fetch、驗證和 pull 階段，然後使用現有的留言串判斷是否已確認可重現的速度變慢問題和預期完成時間；只有在找出原因或明確界定效能修正範圍後，才算完成。