Yes, 1.9.0.932 WIN is slow, or very demanding. Examples:
Batch job of 6 .heic (iPhone 😎 to .jpeg conversions took minutes. Usually it's just seconds.
Sometimes selections feel laggy.
Doing selections causes Photo to no longer respond.
I've never heard the fan of my ThinkCentre before. Today was the first time.
Addition:
tried to open a 2nd file.
Doesn't open.
Tried to quit Photo
This dialog is shown. confirm dialog, closing Photo causes this dialog, confirm dialog, ...
Addition 2:
Just opening a 3142 px x 1908 px file with just one pixel and 2 simple adjustment layers causes the fan of the PC to speed up.
Addition 3: "You also might want to try disabling OpenCL from Preferences > Performance."
Did it. Seems to solve it. Intel(R) UHD Graphics 630.