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
** Changed in: kvm (Ubuntu)
Status: Incomplete => Won't Fix
** Changed in: qemu (Ubuntu)
Status: New => Won't Fix
** Also affects: qemu-kvm (Ubuntu)
Importance: Undecided
Status: New
** Changed in: qemu-kvm (Ubuntu)
Status: New => Incomplete
** Changed in: qemu-kvm (Ubuntu)
Importance: Undecided => Low
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Using -usbdevice host: slows the guest OS down to a crawl
https://bugs.launchpad.net/bugs/258771
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