Just found this:
http://www.kraxel.org/blog/2014/03/qemu-and-usb-tablet-cpu-consumtion/
seem that qemu 2.0 have an optimisation for usb-tablet, to disable/enable
polling of usb device when needed only.
Should work out of the box for new windows created vms, but for old vms, this
require to delete 2 reg keys
HLM\SYSTEM\CurrentControlSet\Control\usbflags
HLM\SYSTEM\CurrentControlSet\Enum\USB
to reinstall the drivers.
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