CPU usage drops with DR

[flat]

When DR is enabled (without children) in the win10 + vray_adv_51020_maya2020_x64 + Core i9-12900k environment, all threads are not used. (40% usage)
When DR is disabled, it will be used 100%.

No change even if VRAY_NUM_THREADS is setted to 24Thread or 48Thread.
The Win10 power plan is full power.

Where is the problem?

[waaazoo]

Do you have any phoenix stuff in your scene ?

[flat]

No Phoenix thing doesn't exist.
It is a scene with a simple displacement.

If uncheck DR, Thread will be used 100%.

[flat]

This was a problem with process affinity.
This can be solved by setting the process affinity of Maya or vray.exe to "HIGH" in Task Manager.