ZipOutPutStream Memory Leak and ZipFile.Add() slows down the performance

private void UpdateZipEntry(string zipFileName, string entryFile)

        {

            SharpZip.ZipFile zipFile = new SharpZip.ZipFile(zipFileName); 

            string folderPath = Path.GetDirectoryName(entryFile);

            string fileName = Directory.GetFiles(folderPath).FirstOrDefault(); 

            zipFile.NameTransform = new ZipNameTransform(folderPath);

            zipFile.BeginUpdate();

            zipFile.Add(fileName, SharpZip.CompressionMethod.Deflated);

            zipFile.CommitUpdate();

            zipFile.Close();

        }

Hi,

For small file sources (500-1000 files)

zipFile.Add(fileName, SharpZip.CompressionMethod.Deflated); taking less time. But for large sources eg: 5000 to 50,0000 files taking ages for processing. Approximately its taking 6 Hours for processing.

I can use below approach but zipStream.Write() causes memory leak.

ZipOutputStream zipStream=null;

FileStream fStream = new FileStream(ZipFilename, FileMode.Create, FileAccess.Write);

zipStream = new ZipOutputStream(fStream);

var entry = new ZipEntry(entryName);

zipStream.PutNextEntry(entry);

zipStream.Write(documentBytes, 0, documentBytes.Length);

zipStream.CloseEntry(); 

Is there any way to increase the speed for large files?

Thanks,

Ravichandran