Universal Audio UAD SYSTEM ver.6.3.2 - Manual (Page 47)

UAD System Manual - 47 - Chapter 5: Using Multiple UAD Devices
Devices are disabled only while the UAD Meter & Control Panel application
is open. When the UAD Meter & Control Panel is quit, disabled devices are
re-enabled.
Note: For optimum results, quit any applications using UAD plug-ins before
disabling/enabling devices.
If a UAD Powered Plug-In is loaded on a device then that device is subse-
quently disabled, an error message will be displayed. This occurs because a
plug-in is assigned to a device when it is first instantiated. It stays assigned to
the same device until it is de-instantiated (for example, removed from the in-
sert slot).
Host CPU
Using more than one device can cause a slight increase in host CPU loads, so
disabling unused devices can help you squeeze in a bit more host perfor-
mance if you need it. Using additional devices on the PCIe bus requires host
resources, so running 15 UAD plug-ins on three devices at five plug-ins per
device may require more host CPU than running the same 15 UAD plug-ins on
one device.
For example, if you are trying to minimize latency during tracking by using a
smaller buffer size (which will increase host CPU loading, even on non-UAD
systems) and need a bit more host CPU, disabling one or more UAD devices
during tracking may give the extra pinch of host CPU you need. The buffer
size can then be increased and the UAD device(s) re-enabled for mixing.