Burn VCD by nero

I try to burn a mpeg2 file to VCD by nero. To my surprise, it cost me almost 2 hours to burn a single VCD. It only take 4 minutes to burn a data disk by nero. Do these two types of burning are so different? Or I made any mistake to burn a VCD? Thank you very much!

VCD is MPEG-1, not MPEG-2, so the file has to be converted. What is the resolution of your file?