Slow performance of ZipFile Method

Question

I'm writing a code to compress/zip folders and files in C#, and for this purpose, I am using ZipFile method from System.IO.Compression. Now if I create a zip file using Winrar (fastest mode), it takes considerably less time to zip the folder and the zip file it creates has a reduced size than the zip file created with my program. Is there a way i can increase performance of my program?

ZipFile.CreateFromDirectory(path, fileName, CompressionLevel.Fastest, false);