[ubuntu] 48x CD/DVD drive only ripping at 10x?

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http://ubuntuforums.org – This is my optical drive, which advertises CD reading speeds of 48x. However I've been using Sound Juicer to rip some tasty Dream Theater CDs - it peaked at 10.5x, averaging slightly less. Why is this? If it advertises speeds of 48x surely it should be able to supply them? (I'm running Karmic 64-bit, ripping to a hard drive that can copy 700MB of data to itself in less than 20 seconds, while a CD rip takes over 5 minutes. I have 4GB of RAM, and Sound Juicer takes up at most 2% of my CPU. My specs seem fine - any help or ideas at all would be hugely appreciated! :)) (Hardware)