Resources are not used during rendering

I want to know if the problem is with me or if this is typical behavior of Premiere and AE.
When rendering and editing I notice that the CPU resources are almost not used. The GPU is practically not working. Also, when using the Object Mask tool I see that many resources are free. What is the problem? These operations could be done much faster and the playback would be smoother if all the resources were used.
Several cores of my M1 PRO are loaded at 50-60%, others even less. I am worried about this reason. Any advice?

System info
    Macbook M1 Pro SSD 500GB + Kingston SXS2000 1TB.
    Application: Premiere Pro (Beta) v26.1.1.29
    OS: macOS v26.2.0, RAM: 32,00 GB GB, CPUs (logical): 10