Chony: The T2 uses USB 1.1. Not UBS 2.0. This is a hardware config and can not/will not be updatable via firmware (I have previously confirmed this with Yamaha). Therefore, the faster USB keys will work on a T2 (they are backwards compatiable) but they will NOT work faster on a T2.
Do you have a harddrive in the T2? Does that work faster? I have a harddrive. I don't see a lag on load times. But I don't have large custom style files. I would be more than happy to test one on a USB and the harddrive for you and report back performance.