No offense but are you really that worried about speed?
DVD drives can't read anywhere close to SATA300 speeds to begin with. 1x DVD read is 1.32MB/s so a 24X DVD drive will only be about 32 MB/s.
USB 2.0 will max out at about 40MB/s.
Fantastic. Just means I can now seperate out the page file and system drive. Then attach internal USB for Readyboost. Trying to speed up a dual core atom system. 4-4-4-12 RAM installed so trying to make efficiencies in other areas.