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bbfa235
(Get the code!)
Some USB devices have higher polling frequencies than others. An abnormally high polling frequency could easily cause a guest to crawl to a halt. Also, it could be that your device is a USB 2.0 device that is falling back to USB 1.1 in the guest, which could also slow things down considerably. Otherwise, this could be an issue in the kernel's USB code. None of these are solutions to the bug, but I'm trying to capture a few ideas...
:-Dustin