Fatest Way To Append Image to a PDF File

Hi,
Can you please help me to know what is fastest way to append multiple image to PDF file.

Currently I am appening 26 Image files (7 mb each) into a single page of PDF File. And it is taking around 3 minutes to process , so is there any way to optimize this processing time?
Below is my code to generate PDF.

Document Doc = new Document(“Temp.pdf”);

            // Create instance of PdfFileMend class
            PdfFileMend mendor = new PdfFileMend(Doc);

            var ImgFiles = Directory.GetFiles("D:\\SampleImages").ToList().Where(x => x.Contains(".png"));


            foreach ( string TF in ImgFiles)
            {

                // Text Fragment
                using (FileStream FS = new FileStream(TF, FileMode.Open))
                {

                    Stream Img = new MemoryStream();
                    FS.CopyTo(Img);

                 
                      mendor.AddImage(Img, 1, 50, 50, 400, 400);

                }
            }


            MemoryStream MS = new MemoryStream();
       
            Doc.Save(MS, SaveFormat.Pdf);

Machine Configuration:
RAM:8gb
CPU:Xeon e5-2620 @2.0Ghz
OS : windows 10

Please suggest me some Way outs

Thanks

@mucool95,

Thanks for contacting support.

Can you please share source files along with environment details so that we may further investigate to help you out.