[X-Newbies] IDVD use with slow processor!

[Thomas J. Fobia]

Hello all! I just tried to make an IDVD from Imovie HD. Since the 
"preview" function in IDVD displayed very jerky playback of the movie,  
I didn't attempt to burn my first IDVD project.  Im assuming its because 
I only have a 400 MHz processor in my G-4.

Has anyone used IDVD successfully with a slow processor?
Do I need an expensive upgrade to get use of IDVD?
Is there another way to burn my Imovie to DVD without using IDVD?

Any suggestions would be welcomed.
 Thanks.
Tom