In my case the reason for high memory usage was a hyper-v virtual machine for which I had Dynamic Memory settings enabled for RAM.
RamMap tool helped me to locate the root cause.
First, I noticed in RamMapRamMap
that Driver Locked consumed more then 29GB29GB
out of my 32GB32GB
RAM. Then, I found some article that explained that Driver Locked high memory usage can be caused by the HyperVHyperV
Dynamic Memory enabled, and then I just confirmed that.