make a picture appear within 5 second in Microsoft Visual C#

The loading time depends on different factors such as: Image Width, height, Bits per pixel, Image format, etc. Note that the basic visual studio classes don't support loading all image formats. For more information about GDI+ supported formats, see:
http://msdn.microsoft.com/en-us/library/at62haz6.aspx

We had a requirement in our application to load different file formats in reasonable time. I searched internet and found a good commercial toolkit named leadtools that is specialized in imaging. You can find more information about this SDK here:
http://www.leadtools.com/sdk/formats/default.htm