Matthew Garret have just committed some patches to the rawhide (not F14) tree that re-enable USB autosuspend on some devices. This set includes a workaround in the bluetooth input code that should handle the case where people were seeing their input devices become laggy when autosuspend was enabled, but there's still some chance that other bluetooth devices will behave slightly oddly. If that's the case then try:
echo on >/sys/class/bluetooth/hci0/device/power/control
and see if it improves things. If so then please file a bug and include information about the device you're trying to connect to.
