NeroVision Express SE too slow! help!

OK i have a few rmvb files wanting to burn on dvd.
i used winavi 7.3 to convert to dvd format.
then used nerovision express se to put in background and compress the size of the vob files. but i end up transcoding for about 8-12hours?

i wouldn’t think it’s my RAM problem as some people suggest, because i have 1gb RAM

is there a way for faster burning? thanks.