Pdf generation taking long time

string dataDir = Path.GetFullPath("HtmlTemplate.html");                   

                    Aspose.Pdf.Generator.Pdf pdf = new Aspose.Pdf.Generator.Pdf();

                    Aspose.Pdf.Generator.Section section = pdf.Sections.Add();

                    StreamReader sr = File.OpenText(dataDir);

                    Aspose.Pdf.Generator.Text tempText = newAspose.Pdf.Generator.Text(section, sr.ReadToEnd());

                    tempText.IsHtmlTagSupported = true;

                    section.Paragraphs.Add(tempText);

                    pdf.Save(@"C:\NewGenerateFile.pdf");