If I understand you correctly, the picture was the complete Nero CD-DVD Test that creates a DVD and then runs all the other test and the burst rate is only 11MB/s. In addition, the USB2 ports are builtin on the laptop (on the motherboard).
Since the create data disc via Nero doesn't use the hard drive, the problem is not HD related. Next, do you have the drive attached directly (no HUB) ???
If you have it thru a HUB, remove it, and try again !!!
Your next step is to call DELL. There has to be a BIOS issue, a driver issue, a USB fix, or something else that is pure DELL related.
On your DVD comments: I'm on a Sony P4 2.8GHz laptop using firewire and the riplock removed firmware. I can shrink a movie DVD in about 18 minutes. I only burn at 12X for quaility so it takes 6:30 to burn via Nero.