Firstly, thanks for a great product.
Bootable CD's are generally lot faster if cloned to a DVD, but they are always written onto the area closest to the centre of the disc. Data throughput is a lot higher on the outside of the disc, and a bootable CD image placed there would be correspondingly faster. It may also have less seeking to do. Obviously some data needs to go on the inside of the track to facilitate the boot, but if the bulk of it was on the outer rim I think it would make bootable CD's that have been placed on DVD media a lot faster.
Thanks again.