I experienced problems with displaying GPU usage in tray icon and System Information window: it's always 0.00%.
Since that I installed GPU-Z that now works simultaneously with PH and shows 5-9% or then showing FullHD-content shows 18-21% average usage. So somehow PH's GPU statistics broken for me. Looks like that component is completely not working.
I have no idea then that problem starts. Just only now noticed that then want to be aware of GPU usage.
Win 10 x64 (14393.479)
GPU is inside of Intel Celeron G1610 CPU (Intel HD Graphics). And that is the only GPU in PC.
GPU driver 10.18.10.4425 (as dxdiag shows)