TThrottle seems to be aware of the VMs being used by Cosmology@Home. This line appears on the Programs tab (when "connect to BOINC client" is unchecked):
CPU: vboxwrapper_26200_windows_x86_64.exe, PID: 5560, Threads: 8
and these appear on the list on the BOINC tab:
www.cosmologyathome.org = vboxwrapper_26200_windows_x86_64
...
Slot = #vboxwrapper_26200_windows_x86_64.exe
Nonetheless, TThrottle seems unable to reduce the CPU usage of these processes.
The process that appears in Task Manager as the one that's eating all the CPU doesn't show up in TThrottle; it's called VBoxHeadless.exe. Is there some way to add it to TThrottle as something that should be managed?