Why does sys-usb need so much RAM?

[apparatus]

Maybe if you configure sys-usb as audiovm for your conferences qube:

Audio qube

An audio qube acts as a secure handler for potentially malicious audio devices, preventing them from coming into contact with dom0 (which could otherwise be fatal to the security of the whole system). It thereby mitigates some of the security risks of using USB devices and Bluetooth devices. Nonetheless, we strongly recommend carefully reading the security warning on USB input devices devices before proceeding. With an audio qube, many kinds of devices can be used (that previously were eit…