Scrolling in the latest Lightroom Classic update seems to have over compensated for reported slow scrolling issues. LR now scrolls way faster than any other application making it impossible to just get used to it. I'm constantly flying past where I want to go.
This is a long shot but by any chance, do you have a Logitech mouse? I know there are features such as 'Smooth Scrolling' and 'Scrolling Size'(1 line, 3 lines, 6 lines etc. at a time) in the Setpoint settings. You may want to make sure it is set to 1 line if this is the case.